1 files changed, 35 insertions, 0 deletions
diff --git a/go/zopflipng/zopflipng_test.go b/go/zopflipng/zopflipng_test.go
new file mode 100644
index 0000000..8f3d423
--- /dev/null
+++ b/go/zopflipng/zopflipng_test.go
@@ -0,0 +1,35 @@
+// 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")
+	}
+}