mirror of https://github.com/prometheus/prometheus
51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
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// 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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//go:build dedupelabels
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package labels
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestVarint(t *testing.T) {
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cases := []struct {
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v int
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expected []byte
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}{
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{0, []byte{0, 0}},
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{1, []byte{1, 0}},
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{2, []byte{2, 0}},
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{0x7FFF, []byte{0xFF, 0x7F}},
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{0x8000, []byte{0x00, 0x80, 0x01}},
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{0x8001, []byte{0x01, 0x80, 0x01}},
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{0x3FFFFF, []byte{0xFF, 0xFF, 0x7F}},
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{0x400000, []byte{0x00, 0x80, 0x80, 0x01}},
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{0x400001, []byte{0x01, 0x80, 0x80, 0x01}},
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{0x1FFFFFFF, []byte{0xFF, 0xFF, 0xFF, 0x7F}},
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}
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var buf [16]byte
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for _, c := range cases {
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n := encodeVarint(buf[:], len(buf), c.v)
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require.Equal(t, len(c.expected), len(buf)-n)
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require.Equal(t, c.expected, buf[n:])
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got, m := decodeVarint(string(buf[:]), n)
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require.Equal(t, c.v, got)
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require.Equal(t, len(buf), m)
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}
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require.Panics(t, func() { encodeVarint(buf[:], len(buf), 1<<29) })
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}
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