RestKit Unit Testing Fixture Helpers

gistfile1.m

// Read a fixture from the app bundle
NSString* RKSpecReadFixture(NSString* fileName) {
    NSError* error = nil;
    NSString* filePath = [[NSBundle mainBundle] pathForResource:fileName ofType:nil];
	NSString* fixtureData = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
    if (fixtureData == nil && error) {
        [NSException raise:nil format:@"Failed to read contents of fixture '%@'. Did you add it to the app bundle? Error: %@", fileName, [error localizedDescription]];
    }
	return fixtureData;
}

NSString* RKSpecMIMETypeForFixture(NSString* fileName) {
    NSString* extension = [[fileName pathExtension] lowercaseString];
    if ([extension isEqualToString:@"xml"]) {
        return RKMIMETypeXML;
    } else if ([extension isEqualToString:@"json"]) {
        return RKMIMETypeJSON;
    } else {
        return nil;
    }
}

id RKSpecParseFixture(NSString* fileName) {
    NSError* error = nil;
    NSString* data = RKSpecReadFixture(fileName);
    NSString* MIMEType = RKSpecMIMETypeForFixture(fileName);
    id<RKParser> parser = [[RKParserRegistry sharedRegistry] parserForMIMEType:MIMEType];
    id object = [parser objectFromString:data error:&error];
    if (object == nil) {
        RKLogCritical(@"Failed to parse JSON fixture '%@'. Error: %@", fileName, [error localizedDescription]);
        return nil;
    }
    
    return object;
}