Implicit progress composition is supported, here's an example:

NSProgress *progress = [NSProgress progressWithTotalUnitCount:100];

[progress becomeCurrentWithPendingUnitCount:50];
DFImageTask *task1 = [_manager imageTaskForRequest:[DFImageRequest requestWithResource:[TDFMockResource resourceWithID:@"1"]] completion:nil];
[task1 progress]; // force progress creation
[progress resignCurrent];

[progress becomeCurrentWithPendingUnitCount:50];
DFImageTask *task2 = [_manager imageTaskForRequest:[DFImageRequest requestWithResource:[TDFMockResource resourceWithID:@"2"]] completion:nil];
[task2 progress];
[progress resignCurrent];

double __block fractionCompleted = 0;
[self keyValueObservingExpectationForObject:progress keyPath:@"fractionCompleted" handler:^BOOL(NSProgress *observedObject, NSDictionary *change) {
    fractionCompleted += 0.25;
    XCTAssertEqual(fractionCompleted, observedObject.fractionCompleted);
    return observedObject.fractionCompleted == 1;
}];

[task1 resume];
[task2 resume];

[self waitForExpectationsWithTimeout:1 handler:nil];

NSProgress instead of blocks #19

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