expect_error.feature

Feature: expect error

Expect a proc to change the state of some object.

Scenario: expect error
  Given a file named "expect_error.rb" with:
    """
    describe Object, "#non_existent_message" do
      it "should raise" do
        expect{Object.non_existent_message}.to raise_error(NameError)
      end
    end

    #deliberate failure
    describe Object, "#public_instance_methods" do
      it "should raise" do
        expect{Object.public_instance_methods}.to raise_error(NameError)
      end
    end
    """
  When I run "spec expect_error.rb"
  Then the stdout should include "2 examples, 1 failure"
  Then the stdout should include "expected NameError but nothing was raised"

Scenario: expect no error
  Given a file named "expect_no_error.rb" with:
    """
    describe Object, "#public_instance_methods" do
      it "should not raise" do
        expect{Object.public_instance_methods}.to_not raise_error(NameError)
      end
    end

    #deliberate failure
    describe Object, "#non_existent_message" do
      it "should not raise" do
        expect{Object.non_existent_message}.to_not raise_error(NameError)
      end
    end
    """
  When I run "spec expect_no_error.rb"
  Then the stdout should include "2 examples, 1 failure"
  Then the stdout should include "undefined method `non_existent_message'"