// Copyright 2020 The gVisor 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 tools

import "testing"

// TestApacheBench checks the ApacheBench parsers on sample output.
func TestApacheBench(t *testing.T) {
	// Sample output from apachebench.
	sampleData := `This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 10.10.10.10 (be patient).....done


Server Software:        Apache/2.4.38
Server Hostname:        10.10.10.10
Server Port:            80

Document Path:          /latin10k.txt
Document Length:        210 bytes

Concurrency Level:      1
Time taken for tests:   0.180 seconds
Complete requests:      100
Failed requests:        0
Non-2xx responses:      100
Total transferred:      38800 bytes
HTML transferred:       21000 bytes
Requests per second:    556.44 [#/sec] (mean)
Time per request:       1.797 [ms] (mean)
Time per request:       1.797 [ms] (mean, across all concurrent requests)
Transfer rate:          210.84 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.2      0       2
Processing:     1    2   1.0      1       8
Waiting:        1    1   1.0      1       7
Total:          1    2   1.2      1      10

Percentage of the requests served within a certain time (ms)
  50%      1
  66%      2
  75%      2
  80%      2
  90%      2
  95%      3
  98%      7
  99%     10
 100%     10 (longest request)`

	ab := ApacheBench{}
	want := 210.84
	got, err := ab.parseTransferRate(sampleData)
	if err != nil {
		t.Fatalf("failed to parse transfer rate with error: %v", err)
	} else if got != want {
		t.Fatalf("parseTransferRate got: %f, want: %f", got, want)
	}

	want = 2.0
	got, err = ab.parseLatency(sampleData)
	if err != nil {
		t.Fatalf("failed to parse transfer rate with error: %v", err)
	} else if got != want {
		t.Fatalf("parseLatency got: %f, want: %f", got, want)
	}

	want = 556.44
	got, err = ab.parseRequestsPerSecond(sampleData)
	if err != nil {
		t.Fatalf("failed to parse transfer rate with error: %v", err)
	} else if got != want {
		t.Fatalf("parseRequestsPerSecond got: %f, want: %f", got, want)
	}
}