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7ee52bfb86
* feat: linreg => slope 0 for const values Signed-off-by: mtfoley <mtfoley.mae@gmail.com>
87 lines
2.6 KiB
Go
87 lines
2.6 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package promql
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import (
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"context"
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"math"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/timestamp"
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"github.com/prometheus/prometheus/promql/parser"
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"github.com/prometheus/prometheus/util/teststorage"
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)
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func TestDeriv(t *testing.T) {
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// https://github.com/prometheus/prometheus/issues/2674#issuecomment-315439393
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// This requires more precision than the usual test system offers,
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// so we test it by hand.
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storage := teststorage.New(t)
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defer storage.Close()
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opts := EngineOpts{
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Logger: nil,
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Reg: nil,
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MaxSamples: 10000,
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Timeout: 10 * time.Second,
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}
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engine := NewEngine(opts)
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a := storage.Appender(context.Background())
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metric := labels.FromStrings("__name__", "foo")
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start := 1493712816939
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interval := 30 * 1000
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// Introduce some timestamp jitter to test 0 slope case.
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// https://github.com/prometheus/prometheus/issues/7180
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for i := 0; i < 15; i++ {
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jitter := 12 * i % 2
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a.Append(0, metric, int64(start+interval*i+jitter), 1)
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}
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require.NoError(t, a.Commit())
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query, err := engine.NewInstantQuery(storage, "deriv(foo[30m])", timestamp.Time(1493712846939))
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require.NoError(t, err)
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result := query.Exec(context.Background())
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require.NoError(t, result.Err)
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vec, _ := result.Vector()
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require.Equal(t, 1, len(vec), "Expected 1 result, got %d", len(vec))
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require.Equal(t, 0.0, vec[0].V, "Expected 0.0 as value, got %f", vec[0].V)
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}
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func TestFunctionList(t *testing.T) {
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// Test that Functions and parser.Functions list the same functions.
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for i := range FunctionCalls {
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_, ok := parser.Functions[i]
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require.True(t, ok, "function %s exists in promql package, but not in parser package", i)
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}
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for i := range parser.Functions {
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_, ok := FunctionCalls[i]
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require.True(t, ok, "function %s exists in parser package, but not in promql package", i)
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}
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}
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func TestKahanSum(t *testing.T) {
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vals := []float64{1.0, math.Pow(10, 100), 1.0, -1 * math.Pow(10, 100)}
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expected := 2.0
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require.Equal(t, expected, kahanSum(vals))
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}
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