Add tests for unless build.without?

Library/Homebrew/rubocops/lines_cop.rb

@@ -274,13 +274,13 @@ module RuboCop
           if find_method_def(@processed_source.ast)
             problem "Define method #{method_name(@offensive_node)} in the class body, not at the top-level"
           end
-          #
-          # find_instance_method_call(body_node, :build, :without?) do |m|
-          #   next unless unless_modifier?(m.parent)
-          #   correct = m.source.gsub("out?", "?").gsub("unless", "if")
-          #   problem "Use #{correct} instead of unless #{m.source}"
-          # end
-          #
+
+          find_instance_method_call(body_node, :build, :without?) do |m|
+            next unless unless_modifier?(m.parent)
+            correct = m.source.gsub("out?", "?")
+            problem "Use if #{correct} instead of unless #{m.source}"
+          end
+
           # find_instance_method_call(body_node, :build, :with?) do |m|
           #   next unless unless_modifier?(m.parent)
           #   correct = m.source.gsub("?", "out?").gsub("unless", "if")

Library/Homebrew/test/rubocops/lines_cop_spec.rb

@@ -619,6 +619,30 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
         expect_offense(expected, actual)
       end
     end
+
+    it "with unless build.without?" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          def post_install
+            return unless build.without? "bar"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: 'Use if build.with? "bar" instead of unless build.without? "bar"',
+                              severity: :convention,
+                              line: 5,
+                              column: 18,
+                              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])