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88 lines
2.7 KiB
88 lines
2.7 KiB
// 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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var start, interval, i int64 |
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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, start+interval*i+jitter, 1) |
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} |
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require.NoError(t, a.Commit()) |
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ctx := context.Background() |
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query, err := engine.NewInstantQuery(ctx, storage, nil, "deriv(foo[30m])", timestamp.Time(1493712846939)) |
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require.NoError(t, err) |
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result := query.Exec(ctx) |
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require.NoError(t, result.Err) |
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vec, _ := result.Vector() |
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require.Len(t, vec, 1, "Expected 1 result, got %d", len(vec)) |
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require.Equal(t, 0.0, vec[0].F, "Expected 0.0 as value, got %f", vec[0].F) |
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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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