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50 lines
1.5 KiB
50 lines
1.5 KiB
// 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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