Convert MacOS::Version test to spec.

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