Enable Flow on more test files (#1806)

Author: IvanGoncharov

src/subscription/__tests__/asyncIteratorReject-test.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @noflow
+ * @flow strict
  */
 
 import { expect } from 'chai';
@@ -33,6 +33,7 @@ describe('asyncIteratorReject', () => {
     const iter = asyncIteratorReject(error);
 
     // Close iterator
+    // $FlowFixMe
     expect(await iter.return()).to.deep.equal({ done: true, value: undefined });
 
     expect(await iter.next()).to.deep.equal({ done: true, value: undefined });

src/subscription/__tests__/eventEmitterAsyncIterator-test.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @noflow
+ * @flow strict
  */
 
 import { expect } from 'chai';
@@ -49,6 +49,7 @@ describe('eventEmitterAsyncIterator', () => {
     const i5 = iterator.next().then(x => x);
 
     // Terminate emitter
+    // $FlowFixMe
     await iterator.return();
 
     // Publish is not caught after terminate

src/subscription/__tests__/subscribe-test.js

@@ -926,7 +926,7 @@ describe('Subscription Publish Phase', () => {
     }
 
     expect(expectedError).to.be.instanceof(Error);
-    expect(expectedError.message).to.equal('test error');
+    expect(expectedError).to.have.property('message', 'test error');
 
     const payload2 = await subscription.next();
     expect(payload2).to.deep.equal({