Add some error coverage and retry

Author: gaearon

packages/react-fetch/src/__tests__/ReactFetchNode-test.js

@@ -104,4 +104,18 @@ describe('ReactFetchNode', () => {
     });
     expect(outputs).toMatchObject(['banana', 'mango', 'orange']);
   });
+
+  // @gate experimental
+  it('can produce an error', async () => {
+    serverImpl = (req, res) => {};
+
+    expect.assertions(1);
+    try {
+      await waitForSuspense(() => {
+        return fetch('BOOM');
+      });
+    } catch (err) {
+      expect(err.message).toEqual('Invalid URL: BOOM');
+    }
+  });
 });

packages/react-suspense-test-utils/src/ReactSuspenseTestUtils.js

@@ -55,7 +55,7 @@ export function waitForSuspense<T>(fn: () => T): Promise<T> {
         resolve(result);
       } catch (thrownValue) {
         if (typeof thrownValue.then === 'function') {
-          thrownValue.then(retry, reject);
+          thrownValue.then(retry, retry);
         } else {
           reject(thrownValue);
         }