Matchers

rspec-rails offers a number of custom matchers, most of which are rspec-compatible wrappers for Rails' assertions.

ruby

# delegates to assert_redirected_to
expect(response).to redirect_to(path)

ruby

# delegates to assert_template
expect(response).to render_template(template_name)

ruby

# passes if assigns(:widget) is an instance of Widget
# and it is not persisted
expect(assigns(:widget)).to be_a_new(Widget)