52 lines
1.2 KiB
Go
52 lines
1.2 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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"strings"
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"testing"
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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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