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d550c4a0b9
At first it wasn't obvious to me why the first check would give a different result to the second. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
// Copyright 2024 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 almost
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import (
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"fmt"
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"math"
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"testing"
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"github.com/prometheus/prometheus/model/value"
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)
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func TestEqual(t *testing.T) {
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staleNaN := math.Float64frombits(value.StaleNaN)
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tests := []struct {
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a float64
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b float64
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epsilon float64
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want bool
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}{
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{0.0, 0.0, 0.0, true},
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{0.0, 0.1, 0.0, false},
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{1.0, 1.1, 0.1, true},
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{-1.0, -1.1, 0.1, true},
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{math.MaxFloat64, math.MaxFloat64 / 10, 0.1, false},
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{1.0, math.NaN(), 0.1, false},
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{math.NaN(), math.NaN(), 0.1, true},
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{math.NaN(), staleNaN, 0.1, false},
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{staleNaN, math.NaN(), 0.1, false},
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{staleNaN, staleNaN, 0.1, true},
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}
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for _, tt := range tests {
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t.Run(fmt.Sprintf("%v,%v,%v", tt.a, tt.b, tt.epsilon), func(t *testing.T) {
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if got := Equal(tt.a, tt.b, tt.epsilon); got != tt.want {
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t.Errorf("Equal(%v,%v,%v) = %v, want %v", tt.a, tt.b, tt.epsilon, got, tt.want)
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}
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})
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}
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}
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