mock_array
array = mock_array(1, f);
array = mock_array(2, f1, f2);
array = mock_array(2, f1, f2);
a1 = mock_array(2, f1, f2);
f4 = mock_array(2, dma_fence_get(f2), dma_fence_get(f1));
f5 = mock_array(2, dma_fence_get(f1), dma_fence_get(f2));
f6 = mock_array(2, dma_fence_get(f3), dma_fence_get(f4));