Use easier to debug fake times in tests

We use the epoch so it is very easy to debug time issues when using
datetime.timestamp().

We also stop the time from ticking, because we want to have full control
over time passing in these tests.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

tests/timeseries/test_resampling.py

@@ -41,7 +41,7 @@ def resampling_function_sum(
     return sum(sample.value for sample in samples if sample.value is not None)
 
 
-@time_machine.travel(datetime.now())
+@time_machine.travel(0, tick=False)
 def test_component_metric_resampler_remove_outdated_samples() -> None:
     """Test if outdated samples are being properly removed."""
     resampler = ComponentMetricResampler(
@@ -63,7 +63,7 @@ def test_component_metric_resampler_remove_outdated_samples() -> None:
     assert len(resampler._buffer) == 0  # pylint: disable=protected-access
 
 
-@time_machine.travel(datetime.now())
+@time_machine.travel(0, tick=False)
 def test_component_metric_resampler_resample() -> None:
     """Test if resampling function works as expected."""
     resampler = ComponentMetricResampler(
@@ -88,7 +88,7 @@ def test_component_metric_resampler_resample() -> None:
     assert value == sum([value1, value2])
 
 
-@time_machine.travel(datetime.now())
+@time_machine.travel(0, tick=False)
 def test_component_metric_resampler_resample_with_outdated_samples() -> None:
     """Test that resampling function doesn't take outdated samples into account."""
     resampler = ComponentMetricResampler(
@@ -116,7 +116,7 @@ def test_component_metric_resampler_resample_with_outdated_samples() -> None:
     assert value == sum([value2, value3])
 
 
-@time_machine.travel(datetime.now())
+@time_machine.travel(0, tick=False)
 def test_component_metric_group_resampler() -> None:
     """Test if resampling is properly delegated to component metric resamplers."""
     resampler = ComponentMetricGroupResampler(