Add a test runner executable.

test/runner_test.dart

Index: test/runner_test.dart
diff --git a/test/runner_test.dart b/test/runner_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2b22667f2bab4fc19fe6f3237480b3fff211892e
--- /dev/null
+++ b/test/runner_test.dart
@@ -0,0 +1,203 @@
+// Copyright (c) 2015, 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.
+
+import 'dart:io';
+
+import 'package:path/path.dart' as p;
+import 'package:unittest/src/exit_codes.dart' as exit_codes;
+import 'package:unittest/unittest.dart';
+
+import 'io.dart';
+
+String _sandbox;
+
+final _success = """
+import 'dart:async';
+
+void main() {
+  var declarer = Zone.current[#unittest.declarer];
+  declarer.test("success", () {});
+}
+""";
+
+final _failure = """
+import 'dart:async';
+
+import 'package:unittest/unittest.dart';
+
+void main() {
+  var declarer = Zone.current[#unittest.declarer];
+  declarer.test("failure", () => throw new TestFailure("oh no"));
+}
+""";
+
+void main() {
+  setUp(() {
+    _sandbox = Directory.systemTemp.createTempSync('unittest_').path;
+  });
+
+  tearDown(() {
+    new Directory(_sandbox).deleteSync(recursive: true);
+  });
+
+  test("prints help information", () {
+    var result = _runUnittest(["--help"]);
+    expect(result.stdout, equals("""
+Runs tests in this package.
+
+Usage: pub run unittest:unittest [files or directories...]
+
+-h, --help    Shows this usage information.
+"""));
+    expect(result.exitCode, equals(exit_codes.success));
+  });
+
+  group("fails gracefully if", () {
+    test("an invalid option is passed", () {
+      var result = _runUnittest(["--asdf"]);
+      expect(result.stderr, equals("""
+Could not find an option named "asdf".
+
+Usage: pub run unittest:unittest [files or directories...]
+
+-h, --help    Shows this usage information.
+"""));
+      expect(result.exitCode, equals(exit_codes.usage));
+    });
+
+    test("a non-existent file is passed", () {
+      var result = _runUnittest(["file"]);
+      expect(result.stderr, equals('Failed to load "file": Does not exist.\n'));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    test("the default directory doesn't exist", () {
+      var result = _runUnittest([]);
+      expect(result.stderr, equals(
+          'Failed to load "test": No test files were passed and the default '
+              'directory doesn\'t exist.\n'));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    test("a test file fails to load", () {
+      var testPath = p.join(_sandbox, "test.dart");
+      new File(testPath).writeAsStringSync("invalid Dart file");
+      var result = _runUnittest(["test.dart"]);
+
+      expect(result.stderr, equals(
+          'Failed to load "${p.relative(testPath, from: _sandbox)}":\n'
+          "line 1 pos 1: unexpected token 'invalid'\n"
+          "invalid Dart file\n"
+          "^\n"));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    test("a test file throws", () {
+      var testPath = p.join(_sandbox, "test.dart");
+      new File(testPath).writeAsStringSync("void main() => throw 'oh no';");
+
+      var result = _runUnittest(["test.dart"]);
+      expect(result.stderr, startsWith(
+          'Failed to load "${p.relative(testPath, from: _sandbox)}": oh no\n'));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    test("a test file doesn't have a main defined", () {
+      var testPath = p.join(_sandbox, "test.dart");
+      new File(testPath).writeAsStringSync("void foo() {}");
+
+      var result = _runUnittest(["test.dart"]);
+      expect(result.stderr, startsWith(
+          'Failed to load "${p.relative(testPath, from: _sandbox)}": No '
+              'top-level main() function defined.\n'));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    test("a test file has a non-function main", () {
+      var testPath = p.join(_sandbox, "test.dart");
+      new File(testPath).writeAsStringSync("int main;");
+
+      var result = _runUnittest(["test.dart"]);
+      expect(result.stderr, startsWith(
+          'Failed to load "${p.relative(testPath, from: _sandbox)}": Top-level '
+              'main getter is not a function.\n'));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    test("a test file has a main with arguments", () {
+      var testPath = p.join(_sandbox, "test.dart");
+      new File(testPath).writeAsStringSync("void main(arg) {}");
+
+      var result = _runUnittest(["test.dart"]);
+      expect(result.stderr, startsWith(
+          'Failed to load "${p.relative(testPath, from: _sandbox)}": Top-level '
+              'main() function takes arguments.\n'));
+      expect(result.exitCode, equals(exit_codes.data));
+    });
+
+    // TODO(nweiz): test what happens when a test file is unreadable once issue
+    // 15078 is fixed.
+  });
+
+  group("runs successful tests", () {
+    test("defined in a single file", () {
+      new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
+      var result = _runUnittest(["test.dart"]);
+      expect(result.exitCode, equals(0));
+    });
+
+    test("defined in a directory", () {
+      for (var i = 0; i < 3; i++) {
+        new File(p.join(_sandbox, "${i}_test.dart"))
+            .writeAsStringSync(_success);
+      }
+
+      var result = _runUnittest(["."]);
+      expect(result.exitCode, equals(0));
+    });
+
+    test("defaulting to the test directory", () {
+      new Directory(p.join(_sandbox, "test")).createSync();
+      for (var i = 0; i < 3; i++) {
+        new File(p.join(_sandbox, "test", "${i}_test.dart"))
+            .writeAsStringSync(_success);
+      }
+
+      var result = _runUnittest([]);
+      expect(result.exitCode, equals(0));
+    });
+  });
+
+  group("runs failing tests", () {
+    test("defined in a single file", () {
+      new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_failure);
+      var result = _runUnittest(["test.dart"]);
+      expect(result.exitCode, equals(1));
+    });
+
+    test("defined in a directory", () {
+      for (var i = 0; i < 3; i++) {
+        new File(p.join(_sandbox, "${i}_test.dart"))
+            .writeAsStringSync(_failure);
+      }
+
+      var result = _runUnittest(["."]);
+      expect(result.exitCode, equals(1));
+    });
+
+    test("defaulting to the test directory", () {
+      new Directory(p.join(_sandbox, "test")).createSync();
+      for (var i = 0; i < 3; i++) {
+        new File(p.join(_sandbox, "test", "${i}_test.dart"))
+            .writeAsStringSync(_failure);
+      }
+
+      var result = _runUnittest([]);
+      expect(result.exitCode, equals(1));
+    });
+  });
+}
+
+ProcessResult _runUnittest(List<String> args) =>
+    runUnittest(args, workingDirectory: _sandbox);