1 files changed, 98 insertions, 0 deletions
diff --git a/internal/gzip/zip_test.go b/internal/gzip/zip_test.go
new file mode 100644
index 0000000..d8c27f6
--- /dev/null
+++ b/internal/gzip/zip_test.go
@@ -0,0 +1,98 @@
+// Copyright 2020 Google LLC All Rights Reserved.
+//
+// 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 gzip
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+	"testing"
+)
+
+func TestReader(t *testing.T) {
+	want := "This is the input string."
+	buf := bytes.NewBufferString(want)
+	zipped := ReadCloser(io.NopCloser(buf))
+	unzipped, err := UnzipReadCloser(zipped)
+	if err != nil {
+		t.Error("UnzipReadCloser() =", err)
+	}
+
+	b, err := io.ReadAll(unzipped)
+	if err != nil {
+		t.Error("ReadAll() =", err)
+	}
+	if got := string(b); got != want {
+		t.Errorf("ReadAll(); got %q, want %q", got, want)
+	}
+	if err := unzipped.Close(); err != nil {
+		t.Error("Close() =", err)
+	}
+}
+
+func TestIs(t *testing.T) {
+	tests := []struct {
+		in  []byte
+		out bool
+		err error
+	}{
+		{[]byte{}, false, nil},
+		{[]byte{'\x00', '\x00', '\x00'}, false, nil},
+		{[]byte{'\x1f', '\x8b', '\x1b'}, true, nil},
+	}
+	for _, test := range tests {
+		reader := bytes.NewReader(test.in)
+		got, err := Is(reader)
+		if got != test.out {
+			t.Errorf("Is; n: got %v, wanted %v\n", got, test.out)
+		}
+		if err != test.err {
+			t.Errorf("Is; err: got %v, wanted %v\n", err, test.err)
+		}
+	}
+}
+
+var (
+	errRead = fmt.Errorf("Read failed")
+)
+
+type failReader struct{}
+
+func (f failReader) Read(_ []byte) (int, error) {
+	return 0, errRead
+}
+
+func TestReadErrors(t *testing.T) {
+	fr := failReader{}
+	if _, err := Is(fr); err != errRead {
+		t.Error("Is: expected errRead, got", err)
+	}
+
+	frc := io.NopCloser(fr)
+	if _, err := UnzipReadCloser(frc); err != errRead {
+		t.Error("UnzipReadCloser: expected errRead, got", err)
+	}
+
+	zr := ReadCloser(io.NopCloser(fr))
+	if _, err := zr.Read(nil); err != errRead {
+		t.Error("ReadCloser: expected errRead, got", err)
+	}
+
+	zr = ReadCloserLevel(io.NopCloser(strings.NewReader("zip me")), -10)
+	if _, err := zr.Read(nil); err == nil {
+		t.Error("Expected invalid level error, got:", err)
+	}
+}