3 files changed, 53 insertions, 55 deletions
diff --git a/Library/Homebrew/test/language_module_requirement_spec.rb b/Library/Homebrew/test/language_module_requirement_spec.rb
new file mode 100644
index 000000000..7f2666855
--- /dev/null
+++ b/Library/Homebrew/test/language_module_requirement_spec.rb
@@ -0,0 +1,49 @@
+require "requirements/language_module_requirement"
+
+describe LanguageModuleRequirement do
+  specify "unique dependencies are not equal" do
+    x = described_class.new(:node, "less")
+    y = described_class.new(:node, "coffee-script")
+    expect(x).not_to eq(y)
+    expect(x.hash).not_to eq(y.hash)
+  end
+
+  context "when module and import name differ" do
+    subject { described_class.new(:python, mod_name, import_name) }
+    let(:mod_name) { "foo" }
+    let(:import_name) { "bar" }
+
+    its(:message) { is_expected.to include(mod_name) }
+    its(:the_test) { is_expected.to include("import #{import_name}") }
+  end
+
+  context "when the language is Perl" do
+    it "does not satisfy invalid dependencies" do
+      expect(described_class.new(:perl, "notapackage")).not_to be_satisfied
+    end
+
+    it "satisfies valid dependencies" do
+      expect(described_class.new(:perl, "Env")).to be_satisfied
+    end
+  end
+
+  context "when the language is Python", :needs_python do
+    it "does not satisfy invalid dependencies" do
+      expect(described_class.new(:python, "notapackage")).not_to be_satisfied
+    end
+
+    it "satisfies valid dependencies" do
+      expect(described_class.new(:python, "datetime")).to be_satisfied
+    end
+  end
+
+  context "when the language is Ruby" do
+    it "does not satisfy invalid dependencies" do
+      expect(described_class.new(:ruby, "notapackage")).not_to be_satisfied
+    end
+
+    it "satisfies valid dependencies" do
+      expect(described_class.new(:ruby, "date")).to be_satisfied
+    end
+  end
+end
diff --git a/Library/Homebrew/test/language_module_requirement_test.rb b/Library/Homebrew/test/language_module_requirement_test.rb
deleted file mode 100644
index dfa992287..000000000
--- a/Library/Homebrew/test/language_module_requirement_test.rb
+++ /dev/null
@@ -1,55 +0,0 @@
-require "testing_env"
-require "requirements/language_module_requirement"
-
-class LanguageModuleRequirementTests < Homebrew::TestCase
-  parallelize_me!
-
-  def assert_deps_fail(spec)
-    refute_predicate LanguageModuleRequirement.new(*spec.shift.reverse), :satisfied?
-  end
-
-  def assert_deps_pass(spec)
-    assert_predicate LanguageModuleRequirement.new(*spec.shift.reverse), :satisfied?
-  end
-
-  def test_unique_deps_are_not_eql
-    x = LanguageModuleRequirement.new(:node, "less")
-    y = LanguageModuleRequirement.new(:node, "coffee-script")
-    refute_eql x, y
-    refute_equal x.hash, y.hash
-  end
-
-  def test_differing_module_and_import_name
-    mod_name = "foo"
-    import_name = "bar"
-    l = LanguageModuleRequirement.new(:python, mod_name, import_name)
-    assert_includes l.message, mod_name
-    assert_includes l.the_test, "import #{import_name}"
-  end
-
-  def test_bad_perl_deps
-    assert_deps_fail "notapackage" => :perl
-  end
-
-  def test_good_perl_deps
-    assert_deps_pass "Env" => :perl
-  end
-
-  def test_bad_python_deps
-    needs_python
-    assert_deps_fail "notapackage" => :python
-  end
-
-  def test_good_python_deps
-    needs_python
-    assert_deps_pass "datetime" => :python
-  end
-
-  def test_bad_ruby_deps
-    assert_deps_fail "notapackage" => :ruby
-  end
-
-  def test_good_ruby_deps
-    assert_deps_pass "date" => :ruby
-  end
-end
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 6ffbf5c8e..67e5f555a 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -33,6 +33,10 @@ RSpec.configure do |config|
     if example.metadata[:needs_macos]
       skip "not on macOS" unless OS.mac?
     end
+
+    if example.metadata[:needs_python]
+      skip "Python not installed." unless which("python")
+    end
   end
   config.around(:each) do |example|
     begin