zopfli/go/zopflipng/zopflipng_test.go

// 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 zopflipng

import (
	"io/ioutil"
	"testing"
)

// TestCompress verifies that ZopfliPng compresses PNGs correctly.
func TestCompress(t *testing.T) {
	path := "testdata/zoidberg.png"
	contents, err := ioutil.ReadFile(path)
	if err != nil {
		t.Errorf("Failed to load testdata: %s", path)
	}
	compressed, err := Compress(contents)
	if err != nil {
		t.Error("ZopfliPNG failed: ", err)
	}
	if len(compressed) >= len(contents) {
		t.Error("ZopfliPNG did not compress png")
	}
}