Fix Broken Test

• Travis CI consistently failed a specific test. It appears that in Travis, the logout function wasn't finishing quickly enough for an assertion.

Author: Nightsd01

iOS_SDK/OneSignalSDK/UnitTests/EmailTests.m

@@ -367,7 +367,8 @@ - (void)testEmailSubscriptionObserver {
 
     [self waitForExpectations:@[expectation] timeout:0.1];
 
-    NSLog(@"CHECKING REQUIRES EMAIL AUTH");
+    [UnitTestCommonMethods runBackgroundThreads];
+    
     XCTAssertEqual(observer->last.to.emailAddress, @"[email protected]");
     XCTAssertEqual(observer->last.to.emailUserId, @"1234");
     XCTAssertEqual(observer->last.to.emailAuthCode, @"test-hash-token");
@@ -382,9 +383,11 @@ - (void)testEmailSubscriptionObserver {
     } withFailure:^(NSError *error) {
         XCTFail(@"Encountered error: %@", error);
     }];
-     
+    
     [self waitForExpectations:@[logoutExpectation] timeout:0.1];
 
+    [UnitTestCommonMethods runBackgroundThreads];
+    
     XCTAssertNil(observer->last.to.emailAddress);
     XCTAssertNil(observer->last.to.emailAuthCode);
     XCTAssertNil(observer->last.to.emailUserId);