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94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
/*
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Copyright 2019 The Kubernetes 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package ioutils
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import (
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"bytes"
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"fmt"
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"math/rand"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestLimitWriter(t *testing.T) {
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r := rand.New(rand.NewSource(1234)) // Fixed source to prevent flakes.
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tests := []struct {
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inputSize, limit, writeSize int64
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}{
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// Single write tests
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{100, 101, 100},
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{100, 100, 100},
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{100, 99, 100},
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{1, 1, 1},
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{100, 10, 100},
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{100, 0, 100},
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{100, -1, 100},
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// Multi write tests
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{100, 101, 10},
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{100, 100, 10},
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{100, 99, 10},
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{100, 10, 10},
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{100, 0, 10},
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{100, -1, 10},
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}
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for _, test := range tests {
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t.Run(fmt.Sprintf("inputSize=%d limit=%d writes=%d", test.inputSize, test.limit, test.writeSize), func(t *testing.T) {
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input := make([]byte, test.inputSize)
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r.Read(input)
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output := &bytes.Buffer{}
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w := LimitWriter(output, test.limit)
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var (
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err error
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written int64
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n int
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)
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for written < test.inputSize && err == nil {
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n, err = w.Write(input[written : written+test.writeSize])
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written += int64(n)
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}
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expectWritten := bounded(0, test.inputSize, test.limit)
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assert.EqualValues(t, expectWritten, written)
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if expectWritten <= 0 {
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assert.Empty(t, output)
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} else {
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assert.Equal(t, input[:expectWritten], output.Bytes())
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}
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if test.limit < test.inputSize {
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assert.Error(t, err)
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} else {
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assert.NoError(t, err)
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}
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})
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}
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}
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func bounded(min, val, max int64) int64 {
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if max < val {
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val = max
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}
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if val < min {
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val = min
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}
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return val
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}
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