Snippet of ChuckPadServiceTests.m from markcerqueira/hello-chuckpad

ChuckPadServiceTests.m

// 1 - Create a new user so we can upload patches
XCTestExpectation *expectation1 = [self expectationWithDescription:@"createUser timed out (1)"];
[[ChuckPadSocial sharedInstance] createUser:user.username email:user.email password:user.password callback:^(BOOL succeeded, NSError *error) {
    [self doPostAuthAssertChecks:user];
    [expectation1 fulfill];
}];
[self waitForExpectations];

// 2 - Upload a new patch
ChuckPadPatch *localPatch = [ChuckPadPatch generatePatch:@"demo0.ck"];
XCTestExpectation *expectation2 = [self expectationWithDescription:@"uploadPatch timed out (2)"];
[[ChuckPadSocial sharedInstance] uploadPatch:localPatch.name description:localPatch.patchDescription parent:-1 filename:localPatch.filename fileData:localPatch.fileData callback:^(BOOL succeeded, Patch *patch, NSError *error) {
    user.totalPatches++;
    
    XCTAssertTrue(succeeded);

    // Assert our username and owner username of patch match and once we confirm that is the case, update our local
    // user object with its user id.
    XCTAssertTrue([patch.creatorUsername isEqualToString:user.username]);
    [user updateUserId:patch.creatorId];
    
    [self assertPatch:patch localPatch:localPatch isConsistentForUser:user];
    
    [expectation2 fulfill];
}];
[self waitForExpectations];