objective-c - Restkit unit testing mapping to array

Question

I am trying to test the RestKit object mapping to an array of elements using RKTestFixtures.

When I try testing just 1 element of my Tutorial-object (which has a name and a description), everything works fine using the test-method below.

- (RKObjectMapping *)tutorialMapping {
    RKObjectMapping *objectMapping = [RKObjectMapping mappingForClass:[Tutorial class]];
    [objectMapping addAttributeMappingsFromDictionary:@{
            @"name" : @"name",
            @"description" : @"description"
    }];
    return objectMapping;
}

- (void)testMappingOfDescriptionWithValue {
    RKMappingTest *mappingTest = [RKMappingTest testForMapping:[self tutorialMapping] sourceObject:self.parsedJSON destinationObject:nil];
    [mappingTest addExpectation:[RKPropertyMappingTestExpectation expectationWithSourceKeyPath:@"description"
                                                                        destinationKeyPath:@"description"
                                                                                     value:@"This is an example description"]];
    XCTAssert([mappingTest evaluate]);
}

But, when I try testing an array of Tutorial-objects like the one below using evaluationBlocks, I can't get the mapping right...

[
    {
        "name": "Tutorial name 1",
        "description": "This is an example description"
    },
    {
        "name": "Tutorial name 2",
        "description": "This is an example description"
    }
]

Does anyone have a solution to this problem? Google didn't get me right through it...

UPDATE

I am sending my JSON using the Fixtures feature:

NSBundle *testTargetBundle = [NSBundle bundleForClass:[self class]];
[RKTestFixture setFixtureBundle:testTargetBundle];

self.parsedJSON = [RKTestFixture parsedObjectWithContentsOfFixture:@"tutorials.json"];

And in my test-method:

RKMappingTest *mappingTest = [RKMappingTest testForMapping:[self tutorialMapping] sourceObject:self.parsedJSON destinationObject:nil];