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// Copyright 2019 Google LLC
//
// 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
//
// https://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 zopfli
import (
"bytes"
"compress/gzip"
"io/ioutil"
"math/rand"
"strings"
"testing"
)
func getRandomBytes(length uint64) []byte {
rng := rand.New(rand.NewSource(1)) // Make test repeatable.
data := make([]byte, length)
for i := uint64(0); i < length; i++ {
data[i] = (byte)(rng.Int())
}
return data
}
// TestGzip verifies that Gzip compresses data correctly.
func TestGzip(t *testing.T) {
compressibleString := "compressthis" + strings.Repeat("_foobar", 1000) + "$"
for _, test := range []struct {
name string
data []byte
maxSize int
}{
{"compressible string", []byte(compressibleString), 500},
{"random binary data", getRandomBytes(3000), 3100},
{"empty string", []byte(""), 20},
} {
compressed := Gzip(test.data)
gzipReader, err := gzip.NewReader(bytes.NewReader(compressed))
if err != nil {
t.Errorf("%s: gzip.NewReader: got error %v, expected no error",
test.name, err)
continue
}
decompressed, err := ioutil.ReadAll(gzipReader)
if err != nil {
t.Errorf("%s: reading gzip stream: got error %v, expected no error",
test.name, err)
continue
}
if bytes.Compare(test.data, decompressed) != 0 {
t.Errorf("%s: mismatch between input and decompressed data", test.name)
continue
}
if test.maxSize > 0 && len(compressed) > test.maxSize {
t.Errorf("%s: compressed data is %d bytes, expected %d or less",
test.name, len(compressed), test.maxSize)
}
}
}
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