Hi guys! I tried to use assert.deepEqual() but all my fears become real :S In fact, I hacked the result object to set a distinct bday Date object as well as a distinct result[photo][0] Blob object (even different size and type) and the assert.deepEqual() passes whereas the previous code fails and reports the error. Consequently, I agreed with @jmcanterafonseca to leave it as it is ;-) Thanks!