Convert FormulaPin test to spec.

Library/Homebrew/test/formula_pin_spec.rb

@@ -0,0 +1,41 @@
+require "formula_pin"
+
+describe FormulaPin do
+  subject { described_class.new(formula) }
+  let(:name) { "double" }
+  let(:formula) { double(Formula, name: name, rack: HOMEBREW_CELLAR/name) }
+
+  before(:each) do
+    formula.rack.mkpath
+
+    allow(formula).to receive(:installed_prefixes) do
+      formula.rack.directory? ? formula.rack.subdirs : []
+    end
+
+    allow(formula).to receive(:installed_kegs) do
+      formula.installed_prefixes.map { |prefix| Keg.new(prefix) }
+    end
+  end
+
+  it "is not pinnable by default" do
+    expect(subject).not_to be_pinnable
+  end
+
+  it "is pinnable if the Keg exists" do
+    (formula.rack/"0.1").mkpath
+    expect(subject).to be_pinnable
+  end
+
+  specify "#pin and #unpin" do
+    (formula.rack/"0.1").mkpath
+
+    subject.pin
+    expect(subject).to be_pinned
+    expect(HOMEBREW_PINNED_KEGS/name).to be_a_directory
+    expect(HOMEBREW_PINNED_KEGS.children.count).to eq(1)
+
+    subject.unpin
+    expect(subject).not_to be_pinned
+    expect(HOMEBREW_PINNED_KEGS).not_to be_a_directory
+  end
+end

Library/Homebrew/test/formula_pin_test.rb

@@ -1,51 +0,0 @@
-require "testing_env"
-require "formula_pin"
-
-class FormulaPinTests < Homebrew::TestCase
-  class FormulaDouble
-    def name
-      "double"
-    end
-
-    def rack
-      HOMEBREW_CELLAR/name
-    end
-
-    def installed_prefixes
-      rack.directory? ? rack.subdirs : []
-    end
-
-    def installed_kegs
-      installed_prefixes.map { |d| Keg.new d }
-    end
-  end
-
-  def setup
-    super
-    @f   = FormulaDouble.new
-    @pin = FormulaPin.new(@f)
-    @f.rack.mkpath
-  end
-
-  def test_not_pinnable
-    refute_predicate @pin, :pinnable?
-  end
-
-  def test_pinnable_if_kegs_exist
-    (@f.rack/"0.1").mkpath
-    assert_predicate @pin, :pinnable?
-  end
-
-  def test_unpin
-    (@f.rack/"0.1").mkpath
-    @pin.pin
-
-    assert_predicate @pin, :pinned?
-    assert_equal 1, HOMEBREW_PINNED_KEGS.children.length
-
-    @pin.unpin
-
-    refute_predicate @pin, :pinned?
-    refute_predicate HOMEBREW_PINNED_KEGS, :directory?
-  end
-end