add parent tests

Author: jgzuke

packages/enzyme-test-suite/test/ReactWrapper-spec.jsx

@@ -3924,15 +3924,13 @@ describeWithDOM('mount', () => {
 </div>`);
       expect(bChild).to.have.lengthOf(1);
 
-      /*
       const bChildParents = bChild.parents('.b');
       expect(bChildParents.debug()).to.equal(`<div className="b">
   <div>
     B child
   </div>
 </div>`);
       expect(bChildParents).to.have.lengthOf(1);
-      */
 
       const aChildParents = aChild.parents('.a');
       expect(aChildParents.debug()).to.equal(`<div className="a">

packages/enzyme-test-suite/test/ShallowWrapper-spec.jsx

@@ -3587,15 +3587,13 @@ describe('shallow', () => {
 </div>`);
       expect(bChild).to.have.lengthOf(1);
 
-      /*
       const bChildParents = bChild.parents('.b');
       expect(bChildParents.debug()).to.equal(`<div className="b">
   <div>
     B child
   </div>
 </div>`);
       expect(bChildParents).to.have.lengthOf(1);
-      */
 
       const aChildParents = aChild.parents('.a');
       expect(aChildParents.debug()).to.equal(`<div className="a">