1 // Go support for Protocol Buffers - Google's data interchange format
3 // Copyright 2012 The Go Authors. All rights reserved.
4 // https://github.com/golang/protobuf
6 // Redistribution and use in source and binary forms, with or without
7 // modification, are permitted provided that the following conditions are
10 // * Redistributions of source code must retain the above copyright
11 // notice, this list of conditions and the following disclaimer.
12 // * Redistributions in binary form must reproduce the above
13 // copyright notice, this list of conditions and the following disclaimer
14 // in the documentation and/or other materials provided with the
16 // * Neither the name of Google Inc. nor the names of its
17 // contributors may be used to endorse or promote products derived from
18 // this software without specific prior written permission.
20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 // Verify that the compiler output for test.proto is unchanged.
46 // sum returns in string form (for easy comparison) the SHA-1 hash of the named file.
47 func sum(t *testing.T, name string) string {
48 data, err := ioutil.ReadFile(name)
52 t.Logf("sum(%q): length is %d", name, len(data))
54 _, err = hash.Write(data)
58 return fmt.Sprintf("% x", hash.Sum(nil))
61 func run(t *testing.T, name string, args ...string) {
62 cmd := exec.Command(name, args...)
64 cmd.Stdout = os.Stdout
65 cmd.Stderr = os.Stderr
72 func TestGolden(t *testing.T) {
73 // Compute the original checksum.
74 goldenSum := sum(t, "test.pb.go")
75 // Run the proto compiler.
76 run(t, "protoc", "--go_out="+os.TempDir(), "test.proto")
77 newFile := filepath.Join(os.TempDir(), "test.pb.go")
78 defer os.Remove(newFile)
79 // Compute the new checksum.
80 newSum := sum(t, newFile)
82 if newSum != goldenSum {
83 run(t, "diff", "-u", "test.pb.go", newFile)
84 t.Fatal("Code generated by protoc-gen-go has changed; update test.pb.go")