diff --git a/Library/Homebrew/test/os/mac/version_spec.rb b/Library/Homebrew/test/os/mac/version_spec.rb
new file mode 100644
index 0000000000..797207b678
--- /dev/null
+++ b/Library/Homebrew/test/os/mac/version_spec.rb
@@ -0,0 +1,51 @@
+require "version"
+require "os/mac/version"
+
+describe OS::Mac::Version do
+  subject { described_class.new("10.7") }
+
+  specify "comparison with Symbol" do
+    expect(subject).to be > :snow_leopard
+    expect(subject).to be == :lion
+    expect(subject).to be === :lion # rubocop:disable Style/CaseEquality
+    expect(subject).to be < :mountain_lion
+  end
+
+  specify "comparison with Fixnum" do
+    expect(subject).to be > 10
+    expect(subject).to be < 11
+  end
+
+  specify "comparison with Float" do
+    expect(subject).to be > 10.6
+    expect(subject).to be == 10.7
+    expect(subject).to be === 10.7 # rubocop:disable Style/CaseEquality
+    expect(subject).to be < 10.8
+  end
+
+  specify "comparison with String" do
+    expect(subject).to be > "10.6"
+    expect(subject).to be == "10.7"
+    expect(subject).to be === "10.7" # rubocop:disable Style/CaseEquality
+    expect(subject).to be < "10.8"
+  end
+
+  specify "comparison with Version" do
+    expect(subject).to be > Version.create("10.6")
+    expect(subject).to be == Version.create("10.7")
+    expect(subject).to be === Version.create("10.7") # rubocop:disable Style/CaseEquality
+    expect(subject).to be < Version.create("10.8")
+  end
+
+  specify "#from_symbol" do
+    expect(described_class.from_symbol(:lion)).to eq(subject)
+    expect { described_class.from_symbol(:foo) }
+      .to raise_error(ArgumentError)
+  end
+
+  specify "#pretty_name" do
+    expect(described_class.new("10.11").pretty_name).to eq("El Capitan")
+    expect(described_class.new("10.8").pretty_name).to eq("Mountain Lion")
+    expect(described_class.new("10.10").pretty_name).to eq("Yosemite")
+  end
+end
diff --git a/Library/Homebrew/test/os/mac/version_test.rb b/Library/Homebrew/test/os/mac/version_test.rb
deleted file mode 100644
index ba42176917..0000000000
--- a/Library/Homebrew/test/os/mac/version_test.rb
+++ /dev/null
@@ -1,54 +0,0 @@
-require "testing_env"
-require "version"
-require "os/mac/version"
-
-class OSMacVersionTests < Homebrew::TestCase
-  def setup
-    super
-    @v = MacOS::Version.new("10.7")
-  end
-
-  def test_compare_with_symbol
-    assert_operator @v, :>, :snow_leopard
-    assert_operator @v, :==, :lion
-    assert_operator @v, :===, :lion
-    assert_operator @v, :<, :mountain_lion
-  end
-
-  def test_compare_with_fixnum
-    assert_operator @v, :>, 10
-    assert_operator @v, :<, 11
-  end
-
-  def test_compare_with_float
-    assert_operator @v, :>, 10.6
-    assert_operator @v, :==, 10.7
-    assert_operator @v, :===, 10.7
-    assert_operator @v, :<, 10.8
-  end
-
-  def test_compare_with_string
-    assert_operator @v, :>, "10.6"
-    assert_operator @v, :==, "10.7"
-    assert_operator @v, :===, "10.7"
-    assert_operator @v, :<, "10.8"
-  end
-
-  def test_compare_with_version
-    assert_operator @v, :>, Version.create("10.6")
-    assert_operator @v, :==, Version.create("10.7")
-    assert_operator @v, :===, Version.create("10.7")
-    assert_operator @v, :<, Version.create("10.8")
-  end
-
-  def test_from_symbol
-    assert_equal @v, MacOS::Version.from_symbol(:lion)
-    assert_raises(ArgumentError) { MacOS::Version.from_symbol(:foo) }
-  end
-
-  def test_pretty_name
-    assert_equal "El Capitan", MacOS::Version.new("10.11").pretty_name
-    assert_equal "Mountain Lion", MacOS::Version.new("10.8").pretty_name
-    assert_equal "Yosemite", MacOS::Version.new("10.10").pretty_name
-  end
-end