mockStore now passes exceptions.

For example instead of the former meaningless and misleading error reported, you now see
the reason why your tests failed:

fetchPages
    1) creates FETCH_PAGES_SUCCESS when fetching pages has been done

  0 passing (2s)
  1 failing

  1) fetchPages creates FETCH_PAGES_SUCCESS when fetching pages has been done:
     Error: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test.

------------------------------------------------------------------------------------------------

fetchPages
    1) creates FETCH_PAGES_SUCCESS when fetching pages has been done

  0 passing (47ms)
  1 failing

  1) fetchPages creates FETCH_PAGES_SUCCESS when fetching pages has been done:

      AssertionError: { type: 'FETCH_PAGES_SUCCESS',
  pages:
   [ { id: '5628946bd0771c0e054ec2d5' },
     { id: '5628946bd0771c0e054ec2d6' } ] } deepEqual { type: 'FETCH_PAGES_SUCCESS', pages: {} }
      + expected - actual

       {
      -  "pages": [
      -    {
      -      "id": "5628946bd0771c0e054ec2d5"
      -    }
      -    {
      -      "id": "5628946bd0771c0e054ec2d6"
      -    }
      -  ]
      +  "pages": {}
         "type": "FETCH_PAGES_SUCCESS"
       }

Author: ream88

docs/recipes/WritingTests.md

@@ -131,11 +131,16 @@ function mockStore(getState, expectedActions, done) {
 
       dispatch(action) {
         const expectedAction = expectedActions.shift();
-        expect(action).toEqual(expectedAction);
-        if (done && !expectedActions.length) {
-          done();
+        
+        try {
+          expect(action).toEqual(expectedAction);
+          if (done && !expectedActions.length) {
+            done();
+          }
+          return action;
+        } catch (e) {
+          done(e);
         }
-        return action;
       }
     }
   }