94 lines
2.7 KiB
Go
94 lines
2.7 KiB
Go
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/*
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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 limitwriter
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import (
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"reflect"
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"testing"
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)
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type recordingWriter struct {
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Wrote [][]byte
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}
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func (r *recordingWriter) Write(data []byte) (int, error) {
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r.Wrote = append(r.Wrote, data)
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return len(data), nil
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}
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func TestLimitWriter(t *testing.T) {
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testcases := map[string]struct {
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Limit int64
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Writes [][]byte
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ExpectedRecordedWrites [][]byte
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ExpectedReportedWrites []int
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ExpectedReportedErrors []error
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}{
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"empty": {},
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"empty write": {
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Limit: 1000,
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Writes: [][]byte{{}},
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ExpectedRecordedWrites: [][]byte{{}},
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ExpectedReportedWrites: []int{0},
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ExpectedReportedErrors: []error{nil},
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},
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"unlimited write": {
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Limit: 1000,
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Writes: [][]byte{[]byte(`foo`)},
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ExpectedRecordedWrites: [][]byte{[]byte(`foo`)},
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ExpectedReportedWrites: []int{3},
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ExpectedReportedErrors: []error{nil},
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},
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"limited write": {
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Limit: 5,
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Writes: [][]byte{[]byte(``), []byte(`1`), []byte(`23`), []byte(`456789`), []byte(`10`), []byte(``)},
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ExpectedRecordedWrites: [][]byte{[]byte(``), []byte(`1`), []byte(`23`), []byte(`45`)},
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ExpectedReportedWrites: []int{0, 1, 2, 2, 0, 0},
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ExpectedReportedErrors: []error{nil, nil, nil, ErrMaximumWrite, ErrMaximumWrite, ErrMaximumWrite},
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},
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}
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for k, tc := range testcases {
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var reportedWrites []int
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var reportedErrors []error
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recordingWriter := &recordingWriter{}
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limitwriter := New(recordingWriter, tc.Limit)
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for _, w := range tc.Writes {
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n, err := limitwriter.Write(w)
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reportedWrites = append(reportedWrites, n)
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reportedErrors = append(reportedErrors, err)
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}
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if !reflect.DeepEqual(recordingWriter.Wrote, tc.ExpectedRecordedWrites) {
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t.Errorf("%s: expected recorded writes %v, got %v", k, tc.ExpectedRecordedWrites, recordingWriter.Wrote)
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}
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if !reflect.DeepEqual(reportedWrites, tc.ExpectedReportedWrites) {
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t.Errorf("%s: expected reported writes %v, got %v", k, tc.ExpectedReportedWrites, reportedWrites)
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}
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if !reflect.DeepEqual(reportedErrors, tc.ExpectedReportedErrors) {
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t.Errorf("%s: expected reported errors %v, got %v", k, tc.ExpectedReportedErrors, reportedErrors)
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}
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}
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}
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