54 lines
1.7 KiB
Go
54 lines
1.7 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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"testing"
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"time"
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"github.com/prometheus/prometheus/pkg/labels"
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"github.com/prometheus/prometheus/pkg/timestamp"
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"github.com/prometheus/prometheus/util/testutil"
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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 := testutil.NewStorage(t)
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defer storage.Close()
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engine := NewEngine(nil, nil, 10, 10*time.Second)
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a, err := storage.Appender()
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testutil.Ok(t, err)
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metric := labels.FromStrings("__name__", "foo")
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a.Add(metric, 1493712816939, 1.0)
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a.Add(metric, 1493712846939, 1.0)
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err = a.Commit()
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testutil.Ok(t, err)
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query, err := engine.NewInstantQuery(storage, "deriv(foo[30m])", timestamp.Time(1493712846939))
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testutil.Ok(t, err)
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result := query.Exec(context.Background())
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testutil.Ok(t, result.Err)
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vec, _ := result.Vector()
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testutil.Assert(t, len(vec) == 1, "Expected 1 result, got %d", len(vec))
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testutil.Assert(t, vec[0].V == 0.0, "Expected 0.0 as value, got %f", vec[0].V)
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}
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