diff --git a/Library/Homebrew/cask/lib/hbc/artifact/abstract_uninstall.rb b/Library/Homebrew/cask/lib/hbc/artifact/abstract_uninstall.rb
index 9776a42ae7..735300f084 100644
--- a/Library/Homebrew/cask/lib/hbc/artifact/abstract_uninstall.rb
+++ b/Library/Homebrew/cask/lib/hbc/artifact/abstract_uninstall.rb
@@ -258,7 +258,7 @@ module Hbc
       end
 
       def trash_paths(*paths, command: nil, **_)
-        result = command.run!("/usr/bin/osascript", args: ["-e", <<~'EOS', *paths])
+        result = command.run!("/usr/bin/osascript", args: ["-e", <<~APPLESCRIPT, *paths])
           on run argv
             repeat with i from 1 to (count argv)
               set item i of argv to (item i of argv as POSIX file)
@@ -279,7 +279,7 @@ module Hbc
               return output
             end tell
           end run
-        EOS
+        APPLESCRIPT
 
         # Remove AppleScript's automatic newline.
         result.tap { |r| r.stdout.sub!(/\n$/, "") }
diff --git a/Library/Homebrew/cask/lib/hbc/cli/create.rb b/Library/Homebrew/cask/lib/hbc/cli/create.rb
index e6ca3d7bc9..0f5034a54f 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/create.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/create.rb
@@ -21,7 +21,7 @@ module Hbc
       end
 
       def self.template(cask_token)
-        <<~EOS
+        <<~RUBY
           cask '#{cask_token}' do
             version ''
             sha256 ''
@@ -32,7 +32,7 @@ module Hbc
 
             app ''
           end
-        EOS
+        RUBY
       end
 
       def self.help
diff --git a/Library/Homebrew/dev-cmd/mirror.rb b/Library/Homebrew/dev-cmd/mirror.rb
index f534090ced..17aee140e1 100644
--- a/Library/Homebrew/dev-cmd/mirror.rb
+++ b/Library/Homebrew/dev-cmd/mirror.rb
@@ -27,11 +27,11 @@ module Homebrew
       package_url = "#{bintray_repo_url}/#{bintray_package}"
 
       unless system curl_executable, "--silent", "--fail", "--output", "/dev/null", package_url
-        package_blob = <<~EOS
+        package_blob = <<~JSON
           {"name": "#{bintray_package}",
            "public_download_numbers": true,
            "public_stats": true}
-        EOS
+        JSON
         curl "--silent", "--fail", "--user", "#{bintray_user}:#{bintray_key}",
              "--header", "Content-Type: application/json",
              "--data", package_blob, bintray_repo_url
diff --git a/Library/Homebrew/dev-cmd/tap-new.rb b/Library/Homebrew/dev-cmd/tap-new.rb
index e29b143c39..368afed2a0 100644
--- a/Library/Homebrew/dev-cmd/tap-new.rb
+++ b/Library/Homebrew/dev-cmd/tap-new.rb
@@ -30,7 +30,7 @@ module Homebrew
 
     (tap.path/"Formula").mkpath
 
-    readme = <<~EOS
+    readme = <<~MARKDOWN
       # #{titleized_user} #{titleized_repo}
 
       ## How do I install these formulae?
@@ -46,10 +46,10 @@ module Homebrew
 
       ## Documentation
       `brew help`, `man brew` or check [Homebrew's documentation](https://docs.brew.sh).
-    EOS
+    MARKDOWN
     write_path(tap, "README.md", readme)
 
-    travis = <<~EOS
+    travis = <<~YAML
       language: c
       os: osx
       compiler: clang
@@ -71,7 +71,7 @@ module Homebrew
 
       script:
         - brew test-bot
-    EOS
+    YAML
     write_path(tap, ".travis.yml", travis)
   end
 end
diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 6e37f4ad9e..a138be3e25 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -392,10 +392,10 @@ class Pathname
     mkpath
     targets.each do |target|
       target = Pathname.new(target) # allow pathnames or strings
-      join(target.basename).write <<~EOS
+      join(target.basename).write <<~SH
         #!/bin/bash
         exec "#{target}" "$@"
-      EOS
+      SH
     end
   end
 
@@ -404,10 +404,10 @@ class Pathname
     env_export = ""
     env.each { |key, value| env_export += "#{key}=\"#{value}\" " }
     dirname.mkpath
-    write <<~EOS
+    write <<~SH
       #!/bin/bash
       #{env_export}exec "#{target}" "$@"
-    EOS
+    SH
   end
 
   # Writes a wrapper env script and moves all files to the dst
@@ -427,10 +427,10 @@ class Pathname
     java_home = if java_version
       "JAVA_HOME=\"$(#{Language::Java.java_home_cmd(java_version)})\" "
     end
-    join(script_name).write <<~EOS
+    join(script_name).write <<~SH
       #!/bin/bash
       #{java_home}exec java #{java_opts} -jar #{target_jar} "$@"
-    EOS
+    SH
   end
 
   def install_metafiles(from = Pathname.pwd)
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index b0375cd051..ea7340de96 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1738,10 +1738,10 @@ class Formula
     # keep Homebrew's site-packages in sys.path when using system Python
     user_site_packages = home/"Library/Python/2.7/lib/python/site-packages"
     user_site_packages.mkpath
-    (user_site_packages/"homebrew.pth").write <<~EOS
+    (user_site_packages/"homebrew.pth").write <<~PYTHON
       import site; site.addsitedir("#{HOMEBREW_PREFIX}/lib/python2.7/site-packages")
       import sys, os; sys.path = (os.environ["PYTHONPATH"].split(os.pathsep) if "PYTHONPATH" in os.environ else []) + ["#{HOMEBREW_PREFIX}/lib/python2.7/site-packages"] + sys.path
-    EOS
+    PYTHON
   end
 
   public
diff --git a/Library/Homebrew/formula_creator.rb b/Library/Homebrew/formula_creator.rb
index d3d7494949..6a8fc91ba7 100644
--- a/Library/Homebrew/formula_creator.rb
+++ b/Library/Homebrew/formula_creator.rb
@@ -77,7 +77,7 @@ module Homebrew
     end
 
     def template
-      <<~EOS
+      <<~ERB
         # Documentation: https://docs.brew.sh/Formula-Cookbook
         #                http://www.rubydoc.info/github/Homebrew/brew/master/Formula
         # PLEASE REMOVE ALL GENERATED COMMENTS BEFORE SUBMITTING YOUR PULL REQUEST!
@@ -147,7 +147,7 @@ module Homebrew
             system "false"
           end
         end
-      EOS
+      ERB
     end
   end
 end
diff --git a/Library/Homebrew/language/python.rb b/Library/Homebrew/language/python.rb
index b3b882b8a5..e96fd5ee8e 100644
--- a/Library/Homebrew/language/python.rb
+++ b/Library/Homebrew/language/python.rb
@@ -46,20 +46,20 @@ module Language
     end
 
     def self.in_sys_path?(python, path)
-      script = <<~EOS
+      script = <<~PYTHON
         import os, sys
         [os.path.realpath(p) for p in sys.path].index(os.path.realpath("#{path}"))
-      EOS
+      PYTHON
       quiet_system python, "-c", script
     end
 
     def self.setup_install_args(prefix)
-      shim = <<~EOS
+      shim = <<~PYTHON
         import setuptools, tokenize
         __file__ = 'setup.py'
         exec(compile(getattr(tokenize, 'open', open)(__file__).read()
           .replace('\\r\\n', '\\n'), __file__, 'exec'))
-      EOS
+      PYTHON
       %W[
         -c
         #{shim}
diff --git a/Library/Homebrew/sandbox.rb b/Library/Homebrew/sandbox.rb
index e59e2a5500..bda767970b 100644
--- a/Library/Homebrew/sandbox.rb
+++ b/Library/Homebrew/sandbox.rb
@@ -138,7 +138,7 @@ class Sandbox
   end
 
   class SandboxProfile
-    SEATBELT_ERB = <<~EOS.freeze
+    SEATBELT_ERB = <<~ERB.freeze
       (version 1)
       (debug deny) ; log all denied operations to /var/log/system.log
       <%= rules.join("\n") %>
@@ -157,7 +157,7 @@ class Sandbox
           (with no-sandbox)
           ) ; allow certain processes running without sandbox
       (allow default) ; allow everything else
-    EOS
+    ERB
 
     attr_reader :rules
 
diff --git a/Library/Homebrew/test/cask/artifact/pkg_spec.rb b/Library/Homebrew/test/cask/artifact/pkg_spec.rb
index da6016df4f..74dfa5e5fd 100644
--- a/Library/Homebrew/test/cask/artifact/pkg_spec.rb
+++ b/Library/Homebrew/test/cask/artifact/pkg_spec.rb
@@ -34,7 +34,7 @@ describe Hbc::Artifact::Pkg, :cask do
 
       file = double(path: Pathname.new("/tmp/choices.xml"))
 
-      expect(file).to receive(:write).with(<<~EOS)
+      expect(file).to receive(:write).with <<~XML
         <?xml version="1.0" encoding="UTF-8"?>
         <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
         <plist version="1.0">
@@ -49,7 +49,7 @@ describe Hbc::Artifact::Pkg, :cask do
         \t</dict>
         </array>
         </plist>
-      EOS
+      XML
 
       expect(file).to receive(:close)
       expect(file).to receive(:unlink)
diff --git a/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb b/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb
index e735d5eca8..945340d005 100644
--- a/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb
+++ b/Library/Homebrew/test/cask/cask_loader/from_content_loader_spec.rb
@@ -3,55 +3,55 @@ describe Hbc::CaskLoader::FromContentLoader do
 
   describe "::can_load?" do
     it "returns true for Casks specified with `cask \"token\" do … end`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask "token" do
         end
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask \"token\" do; end`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask "token" do; end
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask 'token' do … end`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask 'token' do
         end
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask 'token' do; end`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask 'token' do; end
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask(\"token\") { … }`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask("token") {
         }
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask(\"token\") {}`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask("token") {}
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask('token') { … }`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask('token') {
         }
-      EOS
+      RUBY
     end
 
     it "returns true for Casks specified with `cask('token') {}`" do
-      expect(described_class).to be_able_to_load <<~EOS
+      expect(described_class).to be_able_to_load <<~RUBY
         cask('token') {}
-      EOS
+      RUBY
     end
   end
 end
diff --git a/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb b/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb
index df2de1f828..8ef1b0a9c8 100644
--- a/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb
+++ b/Library/Homebrew/test/cask/cask_loader/from_uri_loader_spec.rb
@@ -11,11 +11,11 @@ describe Hbc::CaskLoader::FromURILoader do
     end
 
     it "returns false when given a String with Cask contents containing a URL" do
-      expect(described_class).not_to be_able_to_load <<~EOS
+      expect(described_class).not_to be_able_to_load <<~RUBY
         cask 'token' do
           url 'http://example.com/'
         end
-      EOS
+      RUBY
     end
   end
 end
diff --git a/Library/Homebrew/test/cask/cli/cat_spec.rb b/Library/Homebrew/test/cask/cli/cat_spec.rb
index e1db1b17d8..f24e1bb93a 100644
--- a/Library/Homebrew/test/cask/cli/cat_spec.rb
+++ b/Library/Homebrew/test/cask/cli/cat_spec.rb
@@ -7,7 +7,7 @@ describe Hbc::CLI::Cat, :cask do
 
   describe "given a basic Cask" do
     let(:basic_cask_content) {
-      <<~EOS
+      <<~RUBY
         cask 'basic-cask' do
           version '1.2.3'
           sha256 '8c62a2b791cf5f0da6066a0a4b6e85f62949cd60975da062df44adf887f4370b'
@@ -17,7 +17,7 @@ describe Hbc::CLI::Cat, :cask do
 
           app 'TestCask.app'
         end
-      EOS
+      RUBY
     }
 
     it "displays the Cask file content about the specified Cask" do
diff --git a/Library/Homebrew/test/cask/cli/create_spec.rb b/Library/Homebrew/test/cask/cli/create_spec.rb
index 3efd17787d..bc9d28bdec 100644
--- a/Library/Homebrew/test/cask/cli/create_spec.rb
+++ b/Library/Homebrew/test/cask/cli/create_spec.rb
@@ -28,7 +28,7 @@ describe Hbc::CLI::Create, :cask do
   it "drops a template down for the specified Cask" do
     described_class.run("new-cask")
     template = File.read(Hbc::CaskLoader.path("new-cask"))
-    expect(template).to eq <<~EOS
+    expect(template).to eq <<~RUBY
       cask 'new-cask' do
         version ''
         sha256 ''
@@ -39,7 +39,7 @@ describe Hbc::CLI::Create, :cask do
 
         app ''
       end
-    EOS
+    RUBY
   end
 
   it "raises an exception when more than one Cask is given" do
diff --git a/Library/Homebrew/test/cask/cli/uninstall_spec.rb b/Library/Homebrew/test/cask/cli/uninstall_spec.rb
index 0b1f5acfe8..5a34706e9b 100644
--- a/Library/Homebrew/test/cask/cli/uninstall_spec.rb
+++ b/Library/Homebrew/test/cask/cli/uninstall_spec.rb
@@ -109,11 +109,11 @@ describe Hbc::CLI::Uninstall, :cask do
       timestamped_versions.each do |timestamped_version|
         caskroom_path.join(".metadata", *timestamped_version, "Casks").tap(&:mkpath)
                      .join("#{token}.rb").open("w") do |caskfile|
-                       caskfile.puts <<~EOS
+                       caskfile.puts <<~RUBY
                          cask '#{token}' do
                            version '#{timestamped_version[0]}'
                          end
-                       EOS
+                       RUBY
                      end
         caskroom_path.join(timestamped_version[0]).mkpath
       end
@@ -155,13 +155,13 @@ describe Hbc::CLI::Uninstall, :cask do
 
       saved_caskfile.dirname.mkpath
 
-      IO.write saved_caskfile, <<~EOS
+      IO.write saved_caskfile, <<~RUBY
         cask 'ive-been-renamed' do
           version :latest
 
           app 'ive-been-renamed.app'
         end
-      EOS
+      RUBY
     end
 
     it "can still uninstall those Casks" do
diff --git a/Library/Homebrew/test/cask/pkg_spec.rb b/Library/Homebrew/test/cask/pkg_spec.rb
index 027948eaec..eda4f82ce1 100644
--- a/Library/Homebrew/test/cask/pkg_spec.rb
+++ b/Library/Homebrew/test/cask/pkg_spec.rb
@@ -123,7 +123,7 @@ describe Hbc::Pkg, :cask do
     end
 
     let(:pkg_info_plist) do
-      <<~EOS
+      <<~XML
         <?xml version="1.0" encoding="UTF-8"?>
         <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
         <plist version="1.0">
@@ -138,7 +138,7 @@ describe Hbc::Pkg, :cask do
           </dict>
         </dict>
         </plist>
-      EOS
+      XML
     end
 
     it "correctly parses a Property List" do
diff --git a/Library/Homebrew/test/cask/system_command_result_spec.rb b/Library/Homebrew/test/cask/system_command_result_spec.rb
index b71838518a..84d8b55fe8 100644
--- a/Library/Homebrew/test/cask/system_command_result_spec.rb
+++ b/Library/Homebrew/test/cask/system_command_result_spec.rb
@@ -17,7 +17,7 @@ describe Hbc::SystemCommand::Result, :cask do
       EOS
     }
     let(:plist) {
-      <<~EOS
+      <<~XML
         <?xml version="1.0" encoding="UTF-8"?>
         <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
         <plist version="1.0">
@@ -61,7 +61,7 @@ describe Hbc::SystemCommand::Result, :cask do
           </array>
         </dict>
         </plist>
-      EOS
+      XML
     }
 
     context "when stdout contains garbage before XML" do
diff --git a/Library/Homebrew/test/cmd/custom-external-command_spec.rb b/Library/Homebrew/test/cmd/custom-external-command_spec.rb
index 8e6ffe2ff2..7a4e6501de 100644
--- a/Library/Homebrew/test/cmd/custom-external-command_spec.rb
+++ b/Library/Homebrew/test/cmd/custom-external-command_spec.rb
@@ -4,10 +4,10 @@ describe "brew custom-external-command", :integration_test do
       cmd = "custom-external-command-#{rand}"
       file = path/"brew-#{cmd}"
 
-      file.write <<~EOS
+      file.write <<~SH
         #!/bin/sh
         echo 'I am #{cmd}.'
-      EOS
+      SH
       FileUtils.chmod "+x", file
 
       expect { brew cmd, "PATH" => "#{path}#{File::PATH_SEPARATOR}#{ENV["PATH"]}" }
diff --git a/Library/Homebrew/test/cmd/install_spec.rb b/Library/Homebrew/test/cmd/install_spec.rb
index 30f5e582df..f6bcb874a7 100644
--- a/Library/Homebrew/test/cmd/install_spec.rb
+++ b/Library/Homebrew/test/cmd/install_spec.rb
@@ -26,9 +26,9 @@ describe "brew install", :integration_test do
   end
 
   specify "install failures" do
-    path = setup_test_formula "testball1", <<~EOS
+    path = setup_test_formula "testball1", <<~RUBY
       version "1.0"
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }
       .to output(%r{#{HOMEBREW_CELLAR}/testball1/1\.0}).to_stdout
@@ -36,7 +36,7 @@ describe "brew install", :integration_test do
       .and be_a_success
 
     FileUtils.rm path
-    setup_test_formula "testball1", <<~EOS
+    setup_test_formula "testball1", <<~RUBY
       version "2.0"
 
       devel do
@@ -44,7 +44,7 @@ describe "brew install", :integration_test do
         sha256 "#{Formulary.factory("testball1").stable.checksum.hexdigest}"
         version "3.0"
       end
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }
       .to output(/`brew upgrade testball1`/).to_stderr
@@ -90,11 +90,11 @@ describe "brew install", :integration_test do
   end
 
   it "can install keg-only Formulae" do
-    path_keg_only = setup_test_formula "testball1", <<~EOS
+    path_keg_only = setup_test_formula "testball1", <<~RUBY
       version "1.0"
 
       keg_only "test reason"
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }
       .to output(%r{#{HOMEBREW_CELLAR}/testball1/1\.0}).to_stdout
@@ -102,11 +102,11 @@ describe "brew install", :integration_test do
       .and be_a_success
 
     FileUtils.rm path_keg_only
-    setup_test_formula "testball1", <<~EOS
+    setup_test_formula "testball1", <<~RUBY
       version "2.0"
 
       keg_only "test reason"
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }
       .to output(/testball1 1.0 is already installed/).to_stderr
@@ -132,7 +132,7 @@ describe "brew install", :integration_test do
       system "git", "commit", "-m", "Initial repo commit"
     end
 
-    setup_test_formula "testball1", <<~EOS
+    setup_test_formula "testball1", <<~RUBY
       version "1.0"
 
       head "file://#{repo_path}", :using => :git
@@ -140,7 +140,7 @@ describe "brew install", :integration_test do
       def install
         prefix.install Dir["*"]
       end
-    EOS
+    RUBY
 
     # Ignore dependencies, because we'll try to resolve requirements in build.rb
     # and there will be the git requirement, but we cannot instantiate git
@@ -175,13 +175,13 @@ describe "brew install", :integration_test do
   end
 
   it "succeeds when a non-fatal requirement isn't satisfied" do
-    setup_test_formula "testball1", <<~EOS
+    setup_test_formula "testball1", <<~RUBY
       class NonFatalRequirement < Requirement
         satisfy(build_env: false) { false }
       end
 
       depends_on NonFatalRequirement
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }
       .to output(/NonFatalRequirement unsatisfied!/).to_stderr
@@ -190,14 +190,14 @@ describe "brew install", :integration_test do
   end
 
   it "fails when a fatal requirement isn't satisfied" do
-    setup_test_formula "testball1", <<~EOS
+    setup_test_formula "testball1", <<~RUBY
       class FatalRequirement < Requirement
         fatal true
         satisfy { false }
       end
 
       depends_on FatalRequirement
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }
       .to output(/FatalRequirement unsatisfied!/).to_stderr
diff --git a/Library/Homebrew/test/cmd/irb_spec.rb b/Library/Homebrew/test/cmd/irb_spec.rb
index 0423c6ab73..d4e153f24a 100644
--- a/Library/Homebrew/test/cmd/irb_spec.rb
+++ b/Library/Homebrew/test/cmd/irb_spec.rb
@@ -3,11 +3,11 @@ describe "brew irb", :integration_test do
     setup_test_formula "testball"
 
     irb_test = HOMEBREW_TEMP/"irb-test.rb"
-    irb_test.write <<~EOS
+    irb_test.write <<~RUBY
       "testball".f
       :testball.f
       exit
-    EOS
+    RUBY
 
     expect { brew "irb", irb_test }
       .to output(/Interactive Homebrew Shell/).to_stdout
diff --git a/Library/Homebrew/test/cmd/link_spec.rb b/Library/Homebrew/test/cmd/link_spec.rb
index 27ccd0bd5b..2632fd02f4 100644
--- a/Library/Homebrew/test/cmd/link_spec.rb
+++ b/Library/Homebrew/test/cmd/link_spec.rb
@@ -29,9 +29,9 @@ describe "brew link", :integration_test do
   end
 
   it "refuses to link keg-only Formulae" do
-    setup_test_formula "testball1", <<~EOS
+    setup_test_formula "testball1", <<~RUBY
       keg_only "just because"
-    EOS
+    RUBY
 
     expect { brew "install", "testball1" }.to be_a_success
 
diff --git a/Library/Homebrew/test/cmd/options_spec.rb b/Library/Homebrew/test/cmd/options_spec.rb
index bb6b98a47c..ba54f1a2a6 100644
--- a/Library/Homebrew/test/cmd/options_spec.rb
+++ b/Library/Homebrew/test/cmd/options_spec.rb
@@ -1,8 +1,8 @@
 describe "brew options", :integration_test do
   it "prints a given Formula's options" do
-    setup_test_formula "testball", <<~EOS
+    setup_test_formula "testball", <<~RUBY
       depends_on "bar" => :recommended
-    EOS
+    RUBY
 
     expect { brew "options", "testball" }
       .to output("--with-foo\n\tBuild with foo\n--without-bar\n\tBuild without bar support\n\n").to_stdout
diff --git a/Library/Homebrew/test/cmd/switch_spec.rb b/Library/Homebrew/test/cmd/switch_spec.rb
index 8eba0c7dc3..4e101a9d6a 100644
--- a/Library/Homebrew/test/cmd/switch_spec.rb
+++ b/Library/Homebrew/test/cmd/switch_spec.rb
@@ -1,8 +1,8 @@
 describe "brew switch", :integration_test do
   it "allows switching between Formula versions" do
-    setup_test_formula "testball", <<~EOS
+    setup_test_formula "testball", <<~RUBY
       keg_only "just because"
-    EOS
+    RUBY
 
     expect { brew "install", "testball" }.to be_a_success
 
diff --git a/Library/Homebrew/test/cmd/uses_spec.rb b/Library/Homebrew/test/cmd/uses_spec.rb
index 4a8c446a5c..7b2194d5cf 100644
--- a/Library/Homebrew/test/cmd/uses_spec.rb
+++ b/Library/Homebrew/test/cmd/uses_spec.rb
@@ -2,10 +2,10 @@ describe "brew uses", :integration_test do
   it "prints the Formulae a given Formula is used by" do
     setup_test_formula "foo"
     setup_test_formula "bar"
-    setup_test_formula "baz", <<~EOS
+    setup_test_formula "baz", <<~RUBY
       url "https://example.com/baz-1.0"
       depends_on "bar"
-    EOS
+    RUBY
 
     expect { brew "uses", "baz" }
       .to be_a_success
diff --git a/Library/Homebrew/test/deps_spec.rb b/Library/Homebrew/test/deps_spec.rb
index 52cfa6d971..321fede218 100644
--- a/Library/Homebrew/test/deps_spec.rb
+++ b/Library/Homebrew/test/deps_spec.rb
@@ -2,10 +2,10 @@ describe "brew deps", :integration_test do
   before do
     setup_test_formula "foo"
     setup_test_formula "bar"
-    setup_test_formula "baz", <<~EOS
+    setup_test_formula "baz", <<~RUBY
       url "https://example.com/baz-1.0"
       depends_on "bar"
-    EOS
+    RUBY
   end
 
   it "outputs no dependencies for a Formula that has no dependencies" do
diff --git a/Library/Homebrew/test/dev-cmd/audit_spec.rb b/Library/Homebrew/test/dev-cmd/audit_spec.rb
index ef922315ab..be307cb3ba 100644
--- a/Library/Homebrew/test/dev-cmd/audit_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/audit_spec.rb
@@ -19,20 +19,20 @@ module Homebrew
     def formula_text(name, body = nil, options = {})
       path = dir/"#{name}.rb"
 
-      path.write <<~EOS
+      path.write <<~RUBY
         class #{Formulary.class_s(name)} < Formula
           #{body}
         end
         #{options[:patch]}
-      EOS
+      RUBY
 
       described_class.new(path)
     end
 
     specify "simple valid Formula" do
-      ft = formula_text "valid", <<~EOS
+      ft = formula_text "valid", <<~RUBY
         url "http://www.example.com/valid-1.0.tar.gz"
-      EOS
+      RUBY
 
       expect(ft).not_to have_data
       expect(ft).not_to have_end
@@ -50,9 +50,9 @@ module Homebrew
     end
 
     specify "#data?" do
-      ft = formula_text "data", <<~EOS
+      ft = formula_text "data", <<~RUBY
         patch :DATA
-      EOS
+      RUBY
 
       expect(ft).to have_data
     end
@@ -78,11 +78,11 @@ module Homebrew
 
     describe "#problems" do
       it "is empty by default" do
-        fa = formula_auditor "foo", <<~EOS
+        fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
           end
-        EOS
+        RUBY
 
         expect(fa.problems).to be_empty
       end
@@ -92,11 +92,11 @@ module Homebrew
       specify "file permissions" do
         allow(File).to receive(:umask).and_return(022)
 
-        fa = formula_auditor "foo", <<~EOS
+        fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
           end
-        EOS
+        RUBY
 
         path = fa.formula.path
         path.chmod 0400
@@ -107,25 +107,25 @@ module Homebrew
       end
 
       specify "DATA but no __END__" do
-        fa = formula_auditor "foo", <<~EOS
+        fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
             patch :DATA
           end
-        EOS
+        RUBY
 
         fa.audit_file
         expect(fa.problems).to eq(["'DATA' was found, but no '__END__'"])
       end
 
       specify "__END__ but no DATA" do
-        fa = formula_auditor "foo", <<~EOS
+        fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
           end
           __END__
           a patch goes here
-        EOS
+        RUBY
 
         fa.audit_file
         expect(fa.problems).to eq(["'__END__' was found, but 'DATA' is not used"])
@@ -139,12 +139,12 @@ module Homebrew
       end
 
       specify "no issue" do
-        fa = formula_auditor "foo", <<~EOS
+        fa = formula_auditor "foo", <<~RUBY
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
             homepage "http://example.com"
           end
-        EOS
+        RUBY
 
         fa.audit_file
         expect(fa.problems).to eq([])
@@ -153,11 +153,11 @@ module Homebrew
 
     describe "#line_problems" do
       specify "pkgshare" do
-        fa = formula_auditor "foo", <<~EOS, strict: true
+        fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
           end
-        EOS
+        RUBY
 
         fa.line_problems 'ohai "#{share}/foo"', 3
         expect(fa.problems.shift).to eq("Use \#{pkgshare} instead of \#{share}/foo")
@@ -185,12 +185,12 @@ module Homebrew
       # Formulae with "++" in their name would break various audit regexps:
       #   Error: nested *?+ in regexp: /^libxml++3\s/
       specify "++ in name" do
-        fa = formula_auditor "foolibc++", <<~EOS, strict: true
+        fa = formula_auditor "foolibc++", <<~RUBY, strict: true
           class Foolibcxx < Formula
             desc "foolibc++ is a test"
             url "http://example.com/foo-1.0.tgz"
           end
-        EOS
+        RUBY
 
         fa.line_problems 'ohai "#{share}/foolibc++"', 3
         expect(fa.problems.shift)
@@ -206,12 +206,12 @@ module Homebrew
       specify "#audit_github_repository when HOMEBREW_NO_GITHUB_API is set" do
         ENV["HOMEBREW_NO_GITHUB_API"] = "1"
 
-        fa = formula_auditor "foo", <<~EOS, strict: true, online: true
+        fa = formula_auditor "foo", <<~RUBY, strict: true, online: true
           class Foo < Formula
             homepage "https://github.com/example/example"
             url "http://example.com/foo-1.0.tgz"
           end
-        EOS
+        RUBY
 
         fa.audit_github_repository
         expect(fa.problems).to eq([])
@@ -224,14 +224,14 @@ module Homebrew
           subject { fa }
 
           let(:fa) do
-            formula_auditor "foo", <<~EOS, new_formula: true
+            formula_auditor "foo", <<~RUBY, new_formula: true
               class Foo < Formula
                 url "http://example.com/foo-1.0.tgz"
                 homepage "http://example.com"
 
                 depends_on "openssl"
               end
-            EOS
+            RUBY
           end
 
           let(:f_openssl) do
@@ -256,14 +256,14 @@ module Homebrew
           subject { fa }
 
           let(:fa) do
-            formula_auditor "foo", <<~EOS, new_formula: true
+            formula_auditor "foo", <<~RUBY, new_formula: true
               class Foo < Formula
                 url "http://example.com/foo-1.0.tgz"
                 homepage "http://example.com"
 
                 depends_on "bc"
               end
-            EOS
+            RUBY
           end
 
           let(:f_bc) do
@@ -288,13 +288,13 @@ module Homebrew
 
     describe "#audit_keg_only_style" do
       specify "keg_only_needs_downcasing" do
-        fa = formula_auditor "foo", <<~EOS, strict: true
+        fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
 
             keg_only "Because why not"
           end
-        EOS
+        RUBY
 
         fa.audit_keg_only_style
         expect(fa.problems)
@@ -302,13 +302,13 @@ module Homebrew
       end
 
       specify "keg_only_redundant_period" do
-        fa = formula_auditor "foo", <<~EOS, strict: true
+        fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
 
             keg_only "because this line ends in a period."
           end
-        EOS
+        RUBY
 
         fa.audit_keg_only_style
         expect(fa.problems)
@@ -316,7 +316,7 @@ module Homebrew
       end
 
       specify "keg_only_handles_block_correctly" do
-        fa = formula_auditor "foo", <<~EOS, strict: true
+        fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
 
@@ -327,7 +327,7 @@ module Homebrew
               problem
             EOF
           end
-        EOS
+        RUBY
 
         fa.audit_keg_only_style
         expect(fa.problems)
@@ -335,13 +335,13 @@ module Homebrew
       end
 
       specify "keg_only_handles_whitelist_correctly" do
-        fa = formula_auditor "foo", <<~EOS, strict: true
+        fa = formula_auditor "foo", <<~RUBY, strict: true
           class Foo < Formula
             url "http://example.com/foo-1.0.tgz"
 
             keg_only "Apple ships foo in the CLT package"
           end
-        EOS
+        RUBY
 
         fa.audit_keg_only_style
         expect(fa.problems)
@@ -364,13 +364,13 @@ module Homebrew
       let(:formula_path) { tap_path/formula_subpath }
 
       before do
-        origin_formula_path.write <<~EOS
+        origin_formula_path.write <<~RUBY
           class Foo#{foo_version} < Formula
             url "https://example.com/foo-1.0.tar.gz"
             revision 2
             version_scheme 1
           end
-        EOS
+        RUBY
 
         origin_tap_path.mkpath
         origin_tap_path.cd do
@@ -525,11 +525,11 @@ module Homebrew
 
     describe "#audit_url_is_not_binary" do
       specify "it detects a url containing darwin and x86_64" do
-        fa = formula_auditor "foo", <<~EOS, official_tap: true
+        fa = formula_auditor "foo", <<~RUBY, official_tap: true
           class Foo < Formula
             url "https://example.com/example-darwin.x86_64.tar.gz"
           end
-        EOS
+        RUBY
 
         fa.audit_url_is_not_binary
 
@@ -538,11 +538,11 @@ module Homebrew
       end
 
       specify "it detects a url containing darwin and amd64" do
-        fa = formula_auditor "foo", <<~EOS, official_tap: true
+        fa = formula_auditor "foo", <<~RUBY, official_tap: true
           class Foo < Formula
             url "https://example.com/example-darwin.amd64.tar.gz"
           end
-        EOS
+        RUBY
 
         fa.audit_url_is_not_binary
 
@@ -551,7 +551,7 @@ module Homebrew
       end
 
       specify "it works on the devel spec" do
-        fa = formula_auditor "foo", <<~EOS, official_tap: true
+        fa = formula_auditor "foo", <<~RUBY, official_tap: true
           class Foo < Formula
             url "https://example.com/valid-1.0.tar.gz"
 
@@ -559,7 +559,7 @@ module Homebrew
               url "https://example.com/example-darwin.x86_64.tar.gz"
             end
           end
-        EOS
+        RUBY
 
         fa.audit_url_is_not_binary
 
@@ -568,7 +568,7 @@ module Homebrew
       end
 
       specify "it works on the head spec" do
-        fa = formula_auditor "foo", <<~EOS, official_tap: true
+        fa = formula_auditor "foo", <<~RUBY, official_tap: true
           class Foo < Formula
             url "https://example.com/valid-1.0.tar.gz"
 
@@ -576,7 +576,7 @@ module Homebrew
               url "https://example.com/example-darwin.x86_64.tar.gz"
             end
           end
-        EOS
+        RUBY
 
         fa.audit_url_is_not_binary
 
@@ -585,7 +585,7 @@ module Homebrew
       end
 
       specify "it ignores resource urls" do
-        fa = formula_auditor "foo", <<~EOS, official_tap: true
+        fa = formula_auditor "foo", <<~RUBY, official_tap: true
           class Foo < Formula
             url "https://example.com/valid-1.0.tar.gz"
 
@@ -593,7 +593,7 @@ module Homebrew
               url "https://example.com/example-darwin.x86_64.tar.gz"
             end
           end
-        EOS
+        RUBY
 
         fa.audit_url_is_not_binary
 
diff --git a/Library/Homebrew/test/dev-cmd/test_spec.rb b/Library/Homebrew/test/dev-cmd/test_spec.rb
index 1ac1d5d911..000018e8b4 100644
--- a/Library/Homebrew/test/dev-cmd/test_spec.rb
+++ b/Library/Homebrew/test/dev-cmd/test_spec.rb
@@ -1,6 +1,6 @@
 describe "brew test", :integration_test do
   it "tests a given Formula" do
-    setup_test_formula "testball", <<~EOS
+    setup_test_formula "testball", <<~RUBY
       head "https://github.com/example/testball2.git"
 
       devel do
@@ -12,7 +12,7 @@ describe "brew test", :integration_test do
 
       test do
       end
-    EOS
+    RUBY
 
     expect { brew "install", "testball" }.to be_a_success
 
diff --git a/Library/Homebrew/test/formula_installer_spec.rb b/Library/Homebrew/test/formula_installer_spec.rb
index e9d07b05a1..932738742b 100644
--- a/Library/Homebrew/test/formula_installer_spec.rb
+++ b/Library/Homebrew/test/formula_installer_spec.rb
@@ -100,12 +100,12 @@ describe FormulaInstaller do
   specify "check installation sanity pinned dependency" do
     dep_name = "dependency"
     dep_path = CoreTap.new.formula_dir/"#{dep_name}.rb"
-    dep_path.write <<~EOS
+    dep_path.write <<~RUBY
       class #{Formulary.class_s(dep_name)} < Formula
         url "foo"
         version "0.2"
       end
-    EOS
+    RUBY
 
     Formulary.cache.delete(dep_path)
     dependency = Formulary.factory(dep_name)
diff --git a/Library/Homebrew/test/formulary_spec.rb b/Library/Homebrew/test/formulary_spec.rb
index 7e29f61d37..72d7f72fb0 100644
--- a/Library/Homebrew/test/formulary_spec.rb
+++ b/Library/Homebrew/test/formulary_spec.rb
@@ -6,7 +6,7 @@ describe Formulary do
   let(:formula_name) { "testball_bottle" }
   let(:formula_path) { CoreTap.new.formula_dir/"#{formula_name}.rb" }
   let(:formula_content) do
-    <<~EOS
+    <<~RUBY
       class #{described_class.class_s(formula_name)} < Formula
         url "file://#{TEST_FIXTURE_DIR}/tarballs/testball-0.1.tbz"
         sha256 TESTBALL_SHA256
@@ -22,7 +22,7 @@ describe Formulary do
           prefix.install "libexec"
         end
       end
-    EOS
+    RUBY
   end
   let(:bottle_dir) { Pathname.new("#{TEST_FIXTURE_DIR}/bottles") }
   let(:bottle) { bottle_dir/"testball_bottle-0.1.#{Utils::Bottles.tag}.bottle.tar.gz" }
@@ -81,10 +81,10 @@ describe Formulary do
     context "when the Formula has the wrong class" do
       let(:formula_name) { "giraffe" }
       let(:formula_content) do
-        <<~EOS
+        <<~RUBY
           class Wrong#{described_class.class_s(formula_name)} < Formula
           end
-        EOS
+        RUBY
       end
 
       it "raises an error" do
diff --git a/Library/Homebrew/test/java_requirement_spec.rb b/Library/Homebrew/test/java_requirement_spec.rb
index 433d41bb7d..3d6b8cebc9 100644
--- a/Library/Homebrew/test/java_requirement_spec.rb
+++ b/Library/Homebrew/test/java_requirement_spec.rb
@@ -53,10 +53,10 @@ describe JavaRequirement do
       let(:java) { path/"java" }
 
       def setup_java_with_version(version)
-        IO.write java, <<~EOS
+        IO.write java, <<~SH
           #!/bin/sh
           echo 'java version "#{version}"'
-        EOS
+        SH
         FileUtils.chmod "+x", java
       end
 
diff --git a/Library/Homebrew/test/missing_formula_spec.rb b/Library/Homebrew/test/missing_formula_spec.rb
index bd17439d2b..0abec2aaed 100644
--- a/Library/Homebrew/test/missing_formula_spec.rb
+++ b/Library/Homebrew/test/missing_formula_spec.rb
@@ -86,9 +86,9 @@ describe Homebrew::MissingFormula do
       Tap.clear_cache
       tap_path = Tap::TAP_DIRECTORY/"homebrew/homebrew-foo"
       tap_path.mkpath
-      (tap_path/"tap_migrations.json").write <<~EOS
+      (tap_path/"tap_migrations.json").write <<~JSON
         { "migrated-formula": "homebrew/bar" }
-      EOS
+      JSON
     end
 
     context "with a migrated formula" do
diff --git a/Library/Homebrew/test/rubocops/checksum_cop_spec.rb b/Library/Homebrew/test/rubocops/checksum_cop_spec.rb
index 3f720c90fd..f1c6acfc96 100644
--- a/Library/Homebrew/test/rubocops/checksum_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/checksum_cop_spec.rb
@@ -111,7 +111,7 @@ describe RuboCop::Cop::FormulaAudit::ChecksumCase do
 
   context "When auditing checksum with autocorrect" do
     it "When there is uppercase sha256" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           url 'http://example.com/foo-1.0.tgz'
           stable do
@@ -124,9 +124,9 @@ describe RuboCop::Cop::FormulaAudit::ChecksumCase do
             end
           end
         end
-      EOS
+      RUBY
 
-      corrected_source = <<~EOS
+      corrected_source = <<~RUBY
         class Foo < Formula
           url 'http://example.com/foo-1.0.tgz'
           stable do
@@ -139,7 +139,7 @@ describe RuboCop::Cop::FormulaAudit::ChecksumCase do
             end
           end
         end
-      EOS
+      RUBY
 
       new_source = autocorrect_source(source)
       expect(new_source).to eq(corrected_source)
diff --git a/Library/Homebrew/test/rubocops/class_cop_spec.rb b/Library/Homebrew/test/rubocops/class_cop_spec.rb
index 2ea58777ad..71abbda210 100644
--- a/Library/Homebrew/test/rubocops/class_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/class_cop_spec.rb
@@ -31,17 +31,17 @@ describe RuboCop::Cop::FormulaAudit::ClassName do
   end
 
   it "supports auto-correcting deprecated parent classes" do
-    source = <<~EOS
+    source = <<~RUBY
       class Foo < AmazonWebServicesFormula
         url 'http://example.com/foo-1.0.tgz'
       end
-    EOS
+    RUBY
 
-    corrected_source = <<~EOS
+    corrected_source = <<~RUBY
       class Foo < Formula
         url 'http://example.com/foo-1.0.tgz'
       end
-    EOS
+    RUBY
 
     new_source = autocorrect_source(source)
     expect(new_source).to eq(corrected_source)
diff --git a/Library/Homebrew/test/rubocops/components_order_cop_spec.rb b/Library/Homebrew/test/rubocops/components_order_cop_spec.rb
index 7466f2d6b6..cd37ddca1c 100644
--- a/Library/Homebrew/test/rubocops/components_order_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/components_order_cop_spec.rb
@@ -62,26 +62,26 @@ describe RuboCop::Cop::FormulaAudit::ComponentsOrder do
 
   context "When auditing formula components order with autocorrect" do
     it "When url precedes homepage" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           url "http://example.com/foo-1.0.tgz"
           homepage "http://example.com"
         end
-      EOS
+      RUBY
 
-      correct_source = <<~EOS
+      correct_source = <<~RUBY
         class Foo < Formula
           homepage "http://example.com"
           url "http://example.com/foo-1.0.tgz"
         end
-      EOS
+      RUBY
 
       corrected_source = autocorrect_source(source)
       expect(corrected_source).to eq(correct_source)
     end
 
     it "When `resource` precedes `depends_on`" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           url "https://example.com/foo-1.0.tgz"
 
@@ -91,9 +91,9 @@ describe RuboCop::Cop::FormulaAudit::ComponentsOrder do
 
           depends_on "openssl"
         end
-      EOS
+      RUBY
 
-      correct_source = <<~EOS
+      correct_source = <<~RUBY
         class Foo < Formula
           url "https://example.com/foo-1.0.tgz"
 
@@ -103,7 +103,7 @@ describe RuboCop::Cop::FormulaAudit::ComponentsOrder do
             url "https://example.com/foo-2.0.tgz"
           end
         end
-      EOS
+      RUBY
 
       corrected_source = autocorrect_source(source)
       expect(corrected_source).to eq(correct_source)
diff --git a/Library/Homebrew/test/rubocops/dependency_order_cop_spec.rb b/Library/Homebrew/test/rubocops/dependency_order_cop_spec.rb
index f2c6a66f1e..eccdab411d 100644
--- a/Library/Homebrew/test/rubocops/dependency_order_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/dependency_order_cop_spec.rb
@@ -74,23 +74,23 @@ describe RuboCop::Cop::NewFormulaAudit::DependencyOrder do
 
   context "autocorrect" do
     it "wrong conditional depends_on order" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           homepage "http://example.com"
           url "http://example.com/foo-1.0.tgz"
           depends_on "apple" if build.with? "foo"
           depends_on "foo" => :optional
         end
-      EOS
+      RUBY
 
-      correct_source = <<~EOS
+      correct_source = <<~RUBY
         class Foo < Formula
           homepage "http://example.com"
           url "http://example.com/foo-1.0.tgz"
           depends_on "foo" => :optional
           depends_on "apple" if build.with? "foo"
         end
-      EOS
+      RUBY
 
       corrected_source = autocorrect_source(source)
       expect(corrected_source).to eq(correct_source)
diff --git a/Library/Homebrew/test/rubocops/formula_desc_cop_spec.rb b/Library/Homebrew/test/rubocops/formula_desc_cop_spec.rb
index 20600f071d..cc838a6bfc 100644
--- a/Library/Homebrew/test/rubocops/formula_desc_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/formula_desc_cop_spec.rb
@@ -102,19 +102,19 @@ describe RuboCop::Cop::FormulaAuditStrict::Desc do
     end
 
     it "autocorrects all rules" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           url 'http://example.com/foo-1.0.tgz'
           desc ' an bar: commandline foo '
         end
-      EOS
+      RUBY
 
-      correct_source = <<~EOS
+      correct_source = <<~RUBY
         class Foo < Formula
           url 'http://example.com/foo-1.0.tgz'
           desc 'an bar: command-line'
         end
-      EOS
+      RUBY
 
       corrected_source = autocorrect_source(source, "/homebrew-core/Formula/foo.rb")
       expect(corrected_source).to eq(correct_source)
diff --git a/Library/Homebrew/test/rubocops/homepage_cop_spec.rb b/Library/Homebrew/test/rubocops/homepage_cop_spec.rb
index d394f94a16..f5ee83f6dc 100644
--- a/Library/Homebrew/test/rubocops/homepage_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/homepage_cop_spec.rb
@@ -5,11 +5,11 @@ describe RuboCop::Cop::FormulaAudit::Homepage do
 
   context "When auditing homepage" do
     it "When there is no homepage" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           url 'http://example.com/foo-1.0.tgz'
         end
-      EOS
+      RUBY
 
       expected_offenses = [{  message: "Formula should have a homepage.",
                               severity: :convention,
@@ -25,12 +25,12 @@ describe RuboCop::Cop::FormulaAudit::Homepage do
     end
 
     it "Homepage with ftp" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           homepage "ftp://example.com/foo"
           url "http://example.com/foo-1.0.tgz"
         end
-      EOS
+      RUBY
 
       expected_offenses = [{  message: "The homepage should start with http or https (URL is ftp://example.com/foo).",
                               severity: :convention,
@@ -62,12 +62,12 @@ describe RuboCop::Cop::FormulaAudit::Homepage do
       }
 
       formula_homepages.each do |name, homepage|
-        source = <<~EOS
+        source = <<~RUBY
           class #{name.capitalize} < Formula
             homepage "#{homepage}"
             url "http://example.com/#{name}-1.0.tgz"
           end
-        EOS
+        RUBY
 
         inspect_source(source)
         if homepage =~ %r{http:\/\/www\.freedesktop\.org}
diff --git a/Library/Homebrew/test/rubocops/patches_cop_spec.rb b/Library/Homebrew/test/rubocops/patches_cop_spec.rb
index 7711711606..1c146c0c51 100644
--- a/Library/Homebrew/test/rubocops/patches_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/patches_cop_spec.rb
@@ -113,7 +113,7 @@ describe RuboCop::Cop::FormulaAudit::Patches do
     end
 
     it "Formula with nested `def patches`" do
-      source = <<~EOS
+      source = <<~RUBY
         class Foo < Formula
           homepage "ftp://example.com/foo"
           url "http://example.com/foo-1.0.tgz"
@@ -125,7 +125,7 @@ describe RuboCop::Cop::FormulaAudit::Patches do
             }
           end
         end
-      EOS
+      RUBY
 
       expected_offenses = [{ message: "Use the patch DSL instead of defining a 'patches' method",
                              severity: :convention,
@@ -162,7 +162,7 @@ describe RuboCop::Cop::FormulaAudit::Patches do
         "https://patch-diff.githubusercontent.com/raw/foo/foo-bar/pull/100.patch",
       ]
       patch_urls.each do |patch_url|
-        source = <<~EOS
+        source = <<~RUBY
           class Foo < Formula
             homepage "ftp://example.com/foo"
             url "http://example.com/foo-1.0.tgz"
@@ -171,7 +171,7 @@ describe RuboCop::Cop::FormulaAudit::Patches do
               sha256 "63376b8fdd6613a91976106d9376069274191860cd58f039b29ff16de1925621"
             end
           end
-        EOS
+        RUBY
 
         inspect_source(source)
         expected_offense = if patch_url =~ %r{/raw\.github\.com/}
diff --git a/Library/Homebrew/test/rubocops/urls_cop_spec.rb b/Library/Homebrew/test/rubocops/urls_cop_spec.rb
index 9f9f6ded1e..d6b1774dd6 100644
--- a/Library/Homebrew/test/rubocops/urls_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/urls_cop_spec.rb
@@ -111,12 +111,12 @@ describe RuboCop::Cop::FormulaAudit::Urls do
         "col" => 2,
       }]
       formulas.each do |formula|
-        source = <<~EOS
+        source = <<~RUBY
           class Foo < Formula
             desc "foo"
             url "#{formula["url"]}"
           end
-        EOS
+        RUBY
         expected_offenses = [{ message: formula["msg"],
                                severity: :convention,
                                line: 3,
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/with-uninstall-script-app.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/with-uninstall-script-app.rb
index 885f3b1578..dc90f7f46b 100644
--- a/Library/Homebrew/test/support/fixtures/cask/Casks/with-uninstall-script-app.rb
+++ b/Library/Homebrew/test/support/fixtures/cask/Casks/with-uninstall-script-app.rb
@@ -8,10 +8,10 @@ cask 'with-uninstall-script-app' do
   app 'MyFancyApp/MyFancyApp.app'
 
   postflight do
-    IO.write "#{appdir}/MyFancyApp.app/uninstall.sh", <<~EOS
+    IO.write "#{appdir}/MyFancyApp.app/uninstall.sh", <<~SH
       #!/bin/sh
       /bin/rm -r "#{appdir}/MyFancyApp.app"
-    EOS
+    SH
   end
 
   uninstall script: {
diff --git a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
index f8e59ad4b4..1a917be37d 100644
--- a/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
+++ b/Library/Homebrew/test/support/helper/spec/shared_context/integration_test.rb
@@ -127,7 +127,7 @@ RSpec.shared_context "integration test" do
       else
         TEST_FIXTURE_DIR/"tarballs/testball-0.1.tbz"
       end
-      content = <<~EOS
+      content = <<~RUBY
         desc "Some test"
         homepage "https://example.com/#{name}"
         url "file://#{tarball}"
@@ -147,24 +147,24 @@ RSpec.shared_context "integration test" do
         #{content}
 
         # something here
-      EOS
+      RUBY
     when "foo"
-      content = <<~EOS
+      content = <<~RUBY
         url "https://example.com/#{name}-1.0"
-      EOS
+      RUBY
     when "bar"
-      content = <<~EOS
+      content = <<~RUBY
         url "https://example.com/#{name}-1.0"
         depends_on "foo"
-      EOS
+      RUBY
     end
 
     Formulary.core_path(name).tap do |formula_path|
-      formula_path.write <<~EOS
+      formula_path.write <<~RUBY
         class #{Formulary.class_s(name)} < Formula
           #{content}
         end
-      EOS
+      RUBY
     end
   end
 
diff --git a/Library/Homebrew/test/tap_spec.rb b/Library/Homebrew/test/tap_spec.rb
index fafc8a49af..1bcfa4d33f 100644
--- a/Library/Homebrew/test/tap_spec.rb
+++ b/Library/Homebrew/test/tap_spec.rb
@@ -18,22 +18,22 @@ describe Tap do
   end
 
   def setup_tap_files
-    formula_file.write <<~EOS
+    formula_file.write <<~RUBY
       class Foo < Formula
         url "https://example.com/foo-1.0.tar.gz"
       end
-    EOS
+    RUBY
 
     alias_file.parent.mkpath
     ln_s formula_file, alias_file
 
-    (path/"formula_renames.json").write <<~EOS
+    (path/"formula_renames.json").write <<~JSON
       { "oldname": "foo" }
-    EOS
+    JSON
 
-    (path/"tap_migrations.json").write <<~EOS
+    (path/"tap_migrations.json").write <<~JSON
       { "removed-formula": "homebrew/foo" }
-    EOS
+    JSON
 
     [
       cmd_file,
@@ -350,11 +350,11 @@ describe CoreTap do
 
   specify "files" do
     formula_file = subject.formula_dir/"foo.rb"
-    formula_file.write <<~EOS
+    formula_file.write <<~RUBY
       class Foo < Formula
         url "https://example.com/foo-1.0.tar.gz"
       end
-    EOS
+    RUBY
 
     alias_file = subject.alias_dir/"bar"
     alias_file.parent.mkpath
diff --git a/Library/Homebrew/test/utils_spec.rb b/Library/Homebrew/test/utils_spec.rb
index aface21c3b..9b5e68d482 100644
--- a/Library/Homebrew/test/utils_spec.rb
+++ b/Library/Homebrew/test/utils_spec.rb
@@ -92,10 +92,10 @@ describe "globally-scoped helper methods" do
     let(:shell) { dir/"myshell" }
 
     it "starts an interactive shell session" do
-      IO.write shell, <<~EOS
+      IO.write shell, <<~SH
         #!/bin/sh
         echo called > "#{dir}/called"
-      EOS
+      SH
 
       FileUtils.chmod 0755, shell