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add unit tests with all negative values for histogram_stddev and var

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Signed-off-by: Jeanette Tan <jeanette.tan@grafana.com>
This commit is contained in:
Jeanette Tan 2024-03-22 03:42:50 +08:00
parent a9a4fbafb0
commit 9d32754bc0
1 changed files with 32 additions and 0 deletions
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32
promql/engine_test.go
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@ -3498,6 +3498,38 @@ func TestNativeHistogram_HistogramStdDevVar(t *testing.T) {
},
stdVar: 1544.8582535368798, // actual variance: 1738.4082
},
{
name: "-100000, -10000, -1000, -888, -888, -100, -50, -9, -8, -3",
h: &histogram.Histogram{
Count: 10,
ZeroCount: 0,
Sum: -112946,
Schema: 0,
NegativeSpans: []histogram.Span{
{Offset: 2, Length: 3},
{Offset: 1, Length: 2},
{Offset: 2, Length: 1},
{Offset: 3, Length: 1},
{Offset: 2, Length: 1},
},
NegativeBuckets: []int64{1, 0, 0, 0, 0, 2, -2, 0},
},
stdVar: 1240930974.5260057, // actual variance: 882690990
},
{
name: "-10 x10",
h: &histogram.Histogram{
Count: 10,
ZeroCount: 0,
Sum: -100,
Schema: 0,
NegativeSpans: []histogram.Span{
{Offset: 4, Length: 1},
},
NegativeBuckets: []int64{10},
},
stdVar: 454.2741699796952, // actual variance: 0
},
{
name: "-50, -8, 0, 3, 8, 9, 100, NaN",
h: &histogram.Histogram{