mirror of
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121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
/*
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Copyright 2016 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 tail
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import (
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"bytes"
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"os"
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"strings"
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"testing"
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)
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func TestReadAtMost(t *testing.T) {
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file, err := os.CreateTemp("", "TestFileReadAtMost")
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if err != nil {
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t.Fatalf("unable to create temp file")
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}
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defer os.Remove(file.Name())
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line := strings.Repeat("a", blockSize)
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testBytes := []byte(line + "\n" +
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line + "\n" +
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line + "\n" +
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line + "\n" +
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line[blockSize/2:]) // incomplete line
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file.Write(testBytes)
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testCases := []struct {
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name string
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max int64
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longerThanMax bool
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expected string
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}{
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{
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name: "the max is negative",
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max: -1,
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longerThanMax: true,
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expected: "",
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},
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{
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name: "the max is zero",
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max: 0,
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longerThanMax: true,
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expected: "",
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},
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{
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name: "the file length is longer than max",
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max: 1,
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longerThanMax: true,
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expected: "a",
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},
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{
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name: "the file length is longer than max and contains newlines",
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max: blockSize,
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longerThanMax: true,
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expected: strings.Repeat("a", blockSize/2-1) + "\n" + strings.Repeat("a", blockSize/2),
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},
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{
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name: "the max is longer than file length ",
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max: 4613,
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longerThanMax: false,
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expected: string(testBytes),
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},
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}
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for _, test := range testCases {
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readAtMostBytes, longerThanMax, err := ReadAtMost(file.Name(), test.max)
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if err != nil {
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t.Fatalf("Unexpected failure %v", err)
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}
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if test.longerThanMax != longerThanMax {
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t.Fatalf("Unexpected result on whether the file length longer than the max, want: %t, got: %t", test.longerThanMax, longerThanMax)
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}
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if test.expected != string(readAtMostBytes) {
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t.Fatalf("Unexpected most max bytes, want: %s, got: %s", test.expected, readAtMostBytes)
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}
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}
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}
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func TestTail(t *testing.T) {
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line := strings.Repeat("a", blockSize)
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testBytes := []byte(line + "\n" +
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line + "\n" +
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line + "\n" +
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line + "\n" +
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line[blockSize/2:]) // incomplete line
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for c, test := range []struct {
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n int64
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start int64
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}{
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{n: -1, start: 0},
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{n: 0, start: int64(len(line)+1) * 4},
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{n: 1, start: int64(len(line)+1) * 3},
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{n: 9999, start: 0},
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} {
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t.Logf("TestCase #%d: %+v", c, test)
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r := bytes.NewReader(testBytes)
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s, err := FindTailLineStartIndex(r, test.n)
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if err != nil {
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t.Error(err)
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}
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if s != test.start {
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t.Errorf("%d != %d", s, test.start)
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}
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}
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}
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