diff --git a/Library/Homebrew/test/os/mac/keg_spec.rb b/Library/Homebrew/test/os/mac/keg_spec.rb
new file mode 100644
index 0000000000..562c2ba6a6
--- /dev/null
+++ b/Library/Homebrew/test/os/mac/keg_spec.rb
@@ -0,0 +1,32 @@
+require "keg"
+
+describe Keg do
+  include FileUtils
+
+  subject { described_class.new(keg_path) }
+
+  describe "#mach_o_files" do
+    let(:keg_path) { HOMEBREW_CELLAR/"a/1.0" }
+
+    before(:each) { (keg_path/"lib").mkpath }
+
+    after(:each) { subject.unlink }
+
+    it "skips hardlinks" do
+      cp dylib_path("i386"), keg_path/"lib/i386.dylib"
+      ln keg_path/"lib/i386.dylib", keg_path/"lib/i386_hardlink.dylib"
+
+      subject.link
+      expect(subject.mach_o_files.count).to eq(1)
+    end
+
+    it "isn't confused by symlinks" do
+      cp dylib_path("i386"), keg_path/"lib/i386.dylib"
+      ln keg_path/"lib/i386.dylib", keg_path/"lib/i386_hardlink.dylib"
+      ln_s keg_path/"lib/i386.dylib", keg_path/"lib/i386_symlink.dylib"
+
+      subject.link
+      expect(subject.mach_o_files.count).to eq(1)
+    end
+  end
+end
diff --git a/Library/Homebrew/test/os/mac/keg_test.rb b/Library/Homebrew/test/os/mac/keg_test.rb
deleted file mode 100644
index d1103415de..0000000000
--- a/Library/Homebrew/test/os/mac/keg_test.rb
+++ /dev/null
@@ -1,69 +0,0 @@
-require "testing_env"
-require "keg"
-require "stringio"
-
-class OSMacLinkTests < Homebrew::TestCase
-  include FileUtils
-
-  def setup
-    super
-
-    keg = HOMEBREW_CELLAR.join("foo", "1.0")
-    keg.join("bin").mkpath
-
-    %w[hiworld helloworld goodbye_cruel_world].each do |file|
-      touch keg.join("bin", file)
-    end
-
-    @keg = Keg.new(keg)
-    @dst = HOMEBREW_PREFIX.join("bin", "helloworld")
-    @nonexistent = Pathname.new("/some/nonexistent/path")
-
-    @mode = OpenStruct.new
-
-    @old_stdout = $stdout
-    $stdout = StringIO.new
-
-    mkpath HOMEBREW_PREFIX/"bin"
-    mkpath HOMEBREW_PREFIX/"lib"
-  end
-
-  def teardown
-    @keg.unlink
-
-    $stdout = @old_stdout
-
-    rmtree HOMEBREW_PREFIX/"lib"
-
-    super
-  end
-
-  def test_mach_o_files_skips_hardlinks
-    a = HOMEBREW_CELLAR/"a/1.0"
-    (a/"lib").mkpath
-    FileUtils.cp dylib_path("i386"), a/"lib/i386.dylib"
-    FileUtils.ln a/"lib/i386.dylib", a/"lib/i386_link.dylib"
-
-    keg = Keg.new(a)
-    keg.link
-
-    assert_equal 1, keg.mach_o_files.size
-  ensure
-    keg.unlink
-  end
-
-  def test_mach_o_files_isnt_confused_by_symlinks
-    a = HOMEBREW_CELLAR/"a/1.0"
-    (a/"lib").mkpath
-    FileUtils.cp dylib_path("i386"), a/"lib/i386.dylib"
-    FileUtils.ln a/"lib/i386.dylib", a/"lib/i386_link.dylib"
-    FileUtils.ln_s a/"lib/i386.dylib", a/"lib/1.dylib"
-
-    keg = Keg.new(a)
-    keg.link
-
-    assert_equal 1, keg.mach_o_files.size
-  ensure
-    keg.unlink
-  end
-end
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index d8694eefc5..b58125aecc 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -15,6 +15,7 @@ require "global"
 require "tap"
 
 require "test/support/helper/shutup"
+require "test/support/helper/fixtures"
 
 TEST_DIRECTORIES = [
   CoreTap.instance.path/"Formula",
@@ -29,6 +30,7 @@ TEST_DIRECTORIES = [
 RSpec.configure do |config|
   config.order = :random
   config.include(Test::Helper::Shutup)
+  config.include(Test::Helper::Fixtures)
   config.before(:each) do |example|
     if example.metadata[:needs_macos]
       skip "not on macOS" unless OS.mac?
diff --git a/Library/Homebrew/test/support/helper/fixtures.rb b/Library/Homebrew/test/support/helper/fixtures.rb
new file mode 100644
index 0000000000..716fe20081
--- /dev/null
+++ b/Library/Homebrew/test/support/helper/fixtures.rb
@@ -0,0 +1,13 @@
+module Test
+  module Helper
+    module Fixtures
+      def dylib_path(name)
+        Pathname.new("#{TEST_FIXTURE_DIR}/mach/#{name}.dylib")
+      end
+
+      def bundle_path(name)
+        Pathname.new("#{TEST_FIXTURE_DIR}/mach/#{name}.bundle")
+      end
+    end
+  end
+end