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packages/intl/test/message_extraction/message_extraction_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library message_extraction_test;
+
+import 'package:unittest/unittest.dart';
+import 'dart:io';
+import 'dart:async';
+import 'dart:convert';
+import 'package:path/path.dart' as path;
+import '../data_directory.dart';
+
+final dart = Platform.executable;
+
+/** Should we use deferred loading. */
+bool useDeferredLoading = true;
+
+String get _deferredLoadPrefix => useDeferredLoading ? '' : 'no-';
+
+String get deferredLoadArg => '--${_deferredLoadPrefix}use-deferred-loading';
+
+/** The VM arguments we were given, most important package-root. */
+final vmArgs = Platform.executableArguments;
+
+/**
+ * For testing we move the files into a temporary directory so as not to leave
+ * generated files around after a failed test. For debugging, we omit that
+ * step if [useLocalDirectory] is true. The place we move them to is saved as
+ * [tempDir].
+ */
+String get tempDir => _tempDir == null ? _tempDir = _createTempDir() : _tempDir;
+var _tempDir;
+_createTempDir() => useLocalDirectory
+    ? '.'
+    : Directory.systemTemp.createTempSync('message_extraction_test').path;
+
+var useLocalDirectory = false;
+
+/**
+ * Translate a relative file path into this test directory. This is
+ * applied to all the arguments of [run]. It will ignore a string that
+ * is an absolute path or begins with "--", because some of the arguments
+ * might be command-line options.
+ */
+String asTestDirPath([String s]) {
+  if (s == null || s.startsWith("--") || path.isAbsolute(s)) return s;
+  return path.join(intlDirectory, 'test', 'message_extraction', s);
+}
+
+/**
+ * Translate a relative file path into our temp directory. This is
+ * applied to all the arguments of [run]. It will ignore a string that
+ * is an absolute path or begins with "--", because some of the arguments
+ * might be command-line options.
+ */
+String asTempDirPath([String s]) {
+  if (s == null || s.startsWith("--") || path.isAbsolute(s)) return s;
+  return path.join(tempDir, s);
+}
+
+main(arguments) {
+  // If debugging, use --local to avoid copying everything to temporary
+  // directories to make it even harder to debug. Note that this will also
+  // not delete the generated files, so may require manual cleanup.
+  if (arguments.contains("--local")) {
+    print("Testing using local directory for generated files");
+    useLocalDirectory = true;
+  }
+  setUp(copyFilesToTempDirectory);
+  tearDown(deleteGeneratedFiles);
+  test("Test round trip message extraction, translation, code generation, "
+      "and printing", () {
+    var makeSureWeVerify = expectAsync(runAndVerify);
+    return extractMessages(null).then((result) {
+      return generateTranslationFiles(result);
+    }).then((result) {
+      return generateCodeFromTranslation(result);
+    }).then(makeSureWeVerify).then(checkResult);
+  });
+}
+
+void copyFilesToTempDirectory() {
+  if (useLocalDirectory) return;
+  var files = [
+    asTestDirPath('sample_with_messages.dart'),
+    asTestDirPath('part_of_sample_with_messages.dart'),
+    asTestDirPath('verify_messages.dart'),
+    asTestDirPath('run_and_verify.dart'),
+    asTestDirPath('embedded_plural_text_before.dart'),
+    asTestDirPath('embedded_plural_text_after.dart'),
+    asTestDirPath('print_to_list.dart')
+  ];
+  for (var filename in files) {
+    var file = new File(filename);
+    file.copySync(path.join(tempDir, path.basename(filename)));
+  }
+}
+
+void deleteGeneratedFiles() {
+  if (useLocalDirectory) return;
+  try {
+    new Directory(tempDir).deleteSync(recursive: true);
+  } on Error catch (e) {
+    print("Failed to delete $tempDir");
+    print("Exception:\n$e");
+  }
+}
+
+/**
+ * Run the process with the given list of filenames, which we assume
+ * are in dir() and need to be qualified in case that's not our working
+ * directory.
+ */
+Future<ProcessResult> run(
+    ProcessResult previousResult, List<String> filenames) {
+  // If there's a failure in one of the sub-programs, print its output.
+  checkResult(previousResult);
+  var filesInTheRightDirectory = filenames
+      .map((x) => asTempDirPath(x))
+      .map((x) => path.normalize(x))
+      .toList();
+  // Inject the script argument --output-dir in between the script and its
+  // arguments.
+  var args = []
+    ..addAll(vmArgs)
+    ..add(filesInTheRightDirectory.first)
+    ..addAll(["--output-dir=$tempDir"])
+    ..addAll(filesInTheRightDirectory.skip(1));
+  var result =
+      Process.run(dart, args, stdoutEncoding: UTF8, stderrEncoding: UTF8);
+  return result;
+}
+
+void checkResult(ProcessResult previousResult) {
+  if (previousResult != null) {
+    if (previousResult.exitCode != 0) {
+      print("Error running sub-program:");
+    }
+    print(previousResult.stdout);
+    print(previousResult.stderr);
+    print("exitCode=${previousResult.exitCode}");
+    // Fail the test.
+    expect(previousResult.exitCode, 0);
+  }
+}
+
+Future<ProcessResult> extractMessages(ProcessResult previousResult) => run(
+    previousResult, [
+  asTestDirPath('../../bin/extract_to_arb.dart'),
+  '--suppress-warnings',
+  'sample_with_messages.dart',
+  'part_of_sample_with_messages.dart'
+]);
+
+Future<ProcessResult> generateTranslationFiles(ProcessResult previousResult) =>
+    run(previousResult, [
+  asTestDirPath('make_hardcoded_translation.dart'),
+  'intl_messages.arb'
+]);
+
+Future<ProcessResult> generateCodeFromTranslation(
+    ProcessResult previousResult) => run(previousResult, [
+  asTestDirPath('../../bin/generate_from_arb.dart'),
+  deferredLoadArg,
+  '--generated-file-prefix=foo_',
+  'sample_with_messages.dart',
+  'part_of_sample_with_messages.dart',
+  'translation_fr.arb',
+  'translation_de_DE.arb'
+]);
+
+Future<ProcessResult> runAndVerify(ProcessResult previousResult) =>
+    run(previousResult, [asTempDirPath('run_and_verify.dart')]);