heckle.feature

Feature: heckle a class

As an RSpec user who wants to verify that
  my specs cover what I think it covers
I want to heckle a class

Scenario: Heckle finds problems
  Given the following spec:
    """
    class Thing
      def a_or_b
        if true
          "a"
        else
          "b"
        end
      end
    end

    describe Thing do
      it "returns a for true" do
        Thing.new.a_or_b.should == "a"
      end
    end
    """
  When I run it with the spec command --heckle Thing
  Then the stdout should match "The following mutations didn't cause test failures:"
  But the stdout should not match "FAILED"

Scenario: Heckle does not find a problem
  Given the following spec:
    """
    class Thing
      def a_or_b(key)
        if key
          "a"
        else
          "b"
        end
      end
    end

    describe Thing do
      it "returns a for true" do
        Thing.new.a_or_b(true).should == "a"
      end

      it "returns b for false" do
        Thing.new.a_or_b(false).should == "b"
      end
    end
    """
  When I run it with the spec command --heckle Thing
  Then the stdout should match "No mutants survived"
  But the stdout should not match "FAILED"