diff --git a/Library/Homebrew/rubocops/extend/formula_cop.rb b/Library/Homebrew/rubocops/extend/formula_cop.rb
index 4aec1a4c95..c8288ef9f7 100644
--- a/Library/Homebrew/rubocops/extend/formula_cop.rb
+++ b/Library/Homebrew/rubocops/extend/formula_cop.rb
@@ -108,6 +108,8 @@ module RuboCop
       # Matches a method with a receiver,
       # EX: to match `Formula.factory(name)`
       # call `find_instance_method_call(node, "Formula", :factory)`
+      # EX: to match `build.head?`
+      # call `find_instance_method_call(node, :build, :head?)`
       # yields to a block with matching method node
       def find_instance_method_call(node, instance, method_name)
         methods = find_every_method_call_by_name(node, method_name)
diff --git a/Library/Homebrew/rubocops/lines_cop.rb b/Library/Homebrew/rubocops/lines_cop.rb
index 241f9860e0..ab10f6552a 100644
--- a/Library/Homebrew/rubocops/lines_cop.rb
+++ b/Library/Homebrew/rubocops/lines_cop.rb
@@ -129,7 +129,7 @@ module RuboCop
         end
 
         # Node Pattern search for Language::Node
-        def_node_search :languageNodeModule?, <<-EOS.undent 
+        def_node_search :languageNodeModule?, <<-EOS.undent
           (const (const nil :Language) :Node)
         EOS
       end
diff --git a/Library/Homebrew/test/rubocops/lines_cop_spec.rb b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
index b0ed8f4d1d..31aafbcf8e 100644
--- a/Library/Homebrew/test/rubocops/lines_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
@@ -200,5 +200,276 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
         expect_offense(expected, actual)
       end
     end
+
+    it "with invalid rebuild" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          bottle do
+            rebuild 0
+            sha256 "fe0679b932dd43a87fd415b609a7fbac7a069d117642ae8ebaac46ae1fb9f0b3" => :sierra
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "'rebuild 0' should be removed",
+                              severity: :convention,
+                              line: 5,
+                              column: 4,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with OS.linux? check" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          bottle do
+            if OS.linux?
+              nil
+            end
+            sha256 "fe0679b932dd43a87fd415b609a7fbac7a069d117642ae8ebaac46ae1fb9f0b3" => :sierra
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Don't use OS.linux?; Homebrew/core only supports macOS",
+                              severity: :convention,
+                              line: 5,
+                              column: 7,
+                              source: source }]
+
+      inspect_source(cop, source, "/homebrew-core/")
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with fails_with :llvm" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          bottle do
+            sha256 "fe0679b932dd43a87fd415b609a7fbac7a069d117642ae8ebaac46ae1fb9f0b3" => :sierra
+          end
+          fails_with :llvm do
+            build 2335
+            cause "foo"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "'fails_with :llvm' is now a no-op so should be removed",
+                              severity: :convention,
+                              line: 7,
+                              column: 2,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with def test" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+
+          def test
+            assert_equals "1", "1"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Use new-style test definitions (test do)",
+                              severity: :convention,
+                              line: 5,
+                              column: 2,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with def options" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+
+          def options
+            [["--bar", "desc"]]
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Use new-style option definitions",
+                              severity: :convention,
+                              line: 5,
+                              column: 2,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with deprecated skip_clean call" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          skip_clean :all
+        end
+      EOS
+
+      expected_offenses = [{ message: <<-EOS.undent.chomp,
+                              `skip_clean :all` is deprecated; brew no longer strips symbols
+                                      Pass explicit paths to prevent Homebrew from removing empty folders.
+                             EOS
+                             severity: :convention,
+                             line: 4,
+                             column: 2,
+                             source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with build.universal?" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          if build.universal?
+             "foo"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "macOS has been 64-bit only since 10.6 so build.universal? is deprecated.",
+                              severity: :convention,
+                              line: 4,
+                              column: 5,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with ENV.universal_binary" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          if build?
+             ENV.universal_binary
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "macOS has been 64-bit only since 10.6 so ENV.universal_binary is deprecated.",
+                              severity: :convention,
+                              line: 5,
+                              column: 5,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with ENV.universal_binary" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          if build?
+             ENV.x11
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: 'Use "depends_on :x11" instead of "ENV.x11"',
+                              severity: :convention,
+                              line: 5,
+                              column: 5,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with ruby-macho alternatives" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          system "install_name_tool", "-id"
+        end
+      EOS
+
+      expected_offenses = [{  message: 'Use ruby-macho instead of calling "install_name_tool"',
+                              severity: :convention,
+                              line: 4,
+                              column: 10,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
+    it "with npm install without language::Node args" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          system "npm", "install"
+        end
+      EOS
+
+      expected_offenses = [{  message: "Use Language::Node for npm install args",
+                              severity: :convention,
+                              line: 4,
+                              column: 2,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
   end
 end