add test for ENV.fortran

Library/Homebrew/rubocops/lines_cop.rb

@@ -162,11 +162,11 @@ module RuboCop
             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`"
-          # end
-          #
+          find_instance_method_call(body_node, "ENV", :fortran) do
+            next if depends_on?(:fortran)
+            problem "Use `depends_on :fortran` instead of `ENV.fortran`"
+          end
+
           # find_instance_method_call(body_node, :ARGV, :include?) do |m|
           #   param = parameters(m).first
           #   next unless match = regex_match_group(param, %r{--(HEAD|devel)})

Library/Homebrew/test/rubocops/lines_cop_spec.rb

@@ -1141,6 +1141,30 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
       end
     end
 
+    it "with ENV.fortran" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          test do
+            ENV.fortran
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Use `depends_on :fortran` instead of `ENV.fortran`",
+                              severity: :convention,
+                              line: 5,
+                              column: 4,
+                              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])