F                                                                        [100%]
=================================== FAILURES ===================================
___________________________ test_collecting_metrics ____________________________
test_metrics.py:5: in test_collecting_metrics
    collect([])
mylib/metrics.py:3: in collect
    raise ValueError("no samples\nsource: metrics\nwindow: 5m")
E   ValueError: no samples
E   source: metrics
E   window: 5m
1 failed in 0.01s
