github.com/matm/etcd@v0.3.1-0.20140328024009-5b4a473f1453/third_party/code.google.com/p/goprotobuf/proto/testdata/golden_test.go (about)

     1  // Go support for Protocol Buffers - Google's data interchange format
     2  //
     3  // Copyright 2012 The Go Authors.  All rights reserved.
     4  // http://code.google.com/p/goprotobuf/
     5  //
     6  // Redistribution and use in source and binary forms, with or without
     7  // modification, are permitted provided that the following conditions are
     8  // met:
     9  //
    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
    15  // distribution.
    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.
    19  //
    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.
    31  
    32  // Verify that the compiler output for test.proto is unchanged.
    33  
    34  package testdata
    35  
    36  import (
    37  	"crypto/sha1"
    38  	"fmt"
    39  	"io/ioutil"
    40  	"os"
    41  	"os/exec"
    42  	"path/filepath"
    43  	"testing"
    44  )
    45  
    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)
    49  	if err != nil {
    50  		t.Fatal(err)
    51  	}
    52  	t.Logf("sum(%q): length is %d", name, len(data))
    53  	hash := sha1.New()
    54  	_, err = hash.Write(data)
    55  	if err != nil {
    56  		t.Fatal(err)
    57  	}
    58  	return fmt.Sprintf("% x", hash.Sum(nil))
    59  }
    60  
    61  func run(t *testing.T, name string, args ...string) {
    62  	cmd := exec.Command(name, args...)
    63  	cmd.Stdin = os.Stdin
    64  	cmd.Stdout = os.Stdout
    65  	cmd.Stderr = os.Stderr
    66  	err := cmd.Run()
    67  	if err != nil {
    68  		t.Fatal(err)
    69  	}
    70  }
    71  
    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)
    81  	// Verify
    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")
    85  	}
    86  }