53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
|
/*
|
||
|
|
Copyright 2016 The Kubernetes Authors.
|
||
|
|
|
||
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
you may not use this file except in compliance with the License.
|
||
|
|
You may obtain a copy of the License at
|
||
|
|
|
||
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
|
||
|
|
Unless required by applicable law or agreed to in writing, software
|
||
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
See the License for the specific language governing permissions and
|
||
|
|
limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package tail
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"strings"
|
||
|
|
"testing"
|
||
|
|
)
|
||
|
|
|
||
|
|
func TestTail(t *testing.T) {
|
||
|
|
line := strings.Repeat("a", blockSize)
|
||
|
|
testBytes := []byte(line + "\n" +
|
||
|
|
line + "\n" +
|
||
|
|
line + "\n" +
|
||
|
|
line + "\n" +
|
||
|
|
line[blockSize/2:]) // incomplete line
|
||
|
|
|
||
|
|
for c, test := range []struct {
|
||
|
|
n int64
|
||
|
|
start int64
|
||
|
|
}{
|
||
|
|
{n: -1, start: 0},
|
||
|
|
{n: 0, start: int64(len(line)+1) * 4},
|
||
|
|
{n: 1, start: int64(len(line)+1) * 3},
|
||
|
|
{n: 9999, start: 0},
|
||
|
|
} {
|
||
|
|
t.Logf("TestCase #%d: %+v", c, test)
|
||
|
|
r := bytes.NewReader(testBytes)
|
||
|
|
s, err := FindTailLineStartIndex(r, test.n)
|
||
|
|
if err != nil {
|
||
|
|
t.Error(err)
|
||
|
|
}
|
||
|
|
if s != test.start {
|
||
|
|
t.Errorf("%d != %d", s, test.start)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|