Fix Mount CSS prop selector for parity with Shallow

Selector such as `Foo[bar="baz"]` previously would not return any
components when rendering with `mount`.

Resolves enzymejs#534

src/MountedTraversal.js

@@ -84,7 +84,6 @@ export function instHasType(inst, type) {
 }
 
 export function instHasProperty(inst, propKey, stringifiedPropValue) {
- if (!isDOMComponent(inst)) return false;
  const node = getNode(inst);
  const nodeProps = propsOfNode(node);
  const descriptor = Object.getOwnPropertyDescriptor(nodeProps, propKey);

test/ReactWrapper-spec.jsx

@@ -384,6 +384,20 @@ describeWithDOM('mount', () => {
 
  });
 
+ it('should find React Component based on a components prop via css selector', () => {
+ class Foo extends React.Component {
+ render() { return <div />; }
+ }
+ const wrapper = mount(
+ <div>
+ <Foo bar="baz" />
+ </div>
+ );
+
+ expect(wrapper.find('[bar]')).to.have.length(1);
+ expect(wrapper.find('Foo[bar="baz"]')).to.have.length(1);
+ });
+
  it('should not find components with invalid attributes', () => {
  // Invalid attributes aren't valid JSX, so manual instantiation is necessary
  const wrapper = mount(

test/ShallowWrapper-spec.jsx

@@ -481,6 +481,20 @@ describe('shallow', () => {
  expect(wrapper.find('[data-foo]')).to.have.length(1);
  });
 
+ it('should find a React Component based on a components prop via css selector', () => {
+ class Foo extends React.Component {
+ render() { return <div />; }
+ }
+ const wrapper = shallow(
+ <div>
+ <Foo bar="baz" />
+ </div>
+ );
+
+ expect(wrapper.find('[bar]')).to.have.length(1);
+ expect(wrapper.find('Foo[bar="baz"]')).to.have.length(1);
+ });
+
  it('should find components with multiple matching react props', () => {
  function noop() {}
  const wrapper = shallow(