golden_test.go

// Modified for Gorums.
//
// Go support for Protocol Buffers - Google's data interchange format
//
// Copyright 2012 The Go Authors.  All rights reserved.
// https://github.com/golang/protobuf
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package gorums

import (
	"crypto/sha1"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"testing"
)

// sum returns in string form (for easy comparison) the SHA-1 hash of the named file.
func sum(t *testing.T, name string) string {
	data, err := ioutil.ReadFile(name)
	if err != nil {
		t.Fatal(err)
	}
	hash := sha1.New()
	_, err = hash.Write(data)
	if err != nil {
		t.Fatal(err)
	}
	return fmt.Sprintf("% x", hash.Sum(nil))
}

// Verify that the compiler output for register.proto is unchanged.
func TestGolden(t *testing.T) {
	checkProtocVersion(t)

	// Compute the original checksum, run proto compiler,
	// compute new checksum, and verify.
	goldenSum := sum(t, tdRegPbGoRelPath)
	run(t, protoc, protocIFlag, protocOutFlag+os.TempDir(), tdRegProtoRelPath)
	newFile := filepath.Join(os.TempDir(), tdRegPbGoRelPath)
	defer os.Remove(newFile)
	newSum := sum(t, newFile)
	if newSum != goldenSum {
		run(t, "diff", "-u", tdRegPbGoRelPath, newFile)
		t.Fatal("code generated by protoc-gen-gorums has changed; update ", regPbGoFile)
	}
}