add test for inspecting version

Library/Homebrew/rubocops/lines_cop.rb

@@ -157,11 +157,11 @@ module RuboCop
             problem "Dependency #{string_content(dep)} should not use option #{string_content(option)}"
           end
 
-          # find_instance_method_call(body_node, :version, :==) do |m|
-          #   next unless parameters_passed?(m, "HEAD")
-          #   problem "Use 'build.head?' instead of inspecting 'version'"
-          # end
-          #
+          find_instance_method_call(body_node, :version, :==) do |m|
+            next unless parameters_passed?(m, "HEAD")
+            problem "Use 'build.head?' instead of inspecting 'version'"
+          end
+
           # find_instance_method_call(body_node, :ENV, :fortran) do
           #   next if depends_on?(:fortran)
           #   problem "Use `depends_on :fortran` instead of `ENV.fortran`"

Library/Homebrew/test/rubocops/lines_cop_spec.rb

@@ -1117,6 +1117,30 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
       end
     end
 
+    it "with inspecting version" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          if version == "HEAD"
+            foo()
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Use 'build.head?' instead of inspecting 'version'",
+                              severity: :convention,
+                              line: 4,
+                              column: 5,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
   end
   def expect_offense(expected, actual)
     expect(actual.message).to eq(expected[:message])