Migrate language/arithmetic2_test ... language/async_await_syntax_test.

tests/language/assertion_test.dart

-// Copyright (c) 2011, 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.
-// VMOptions=--enable_asserts
-//
-// Dart test program testing assert statements.
-
-import "package:expect/expect.dart";
-
-class AssertionTest {
-  static testTrue() {
-    int i = 0;
-    try {
-      assert(true);
-    } on AssertionError catch (error) {
-      i = 1;
-    }
-    return i;
-  }
-
-  static testFalse() {
-    int i = 0;
-    try {
-      assert(false);
-    } on AssertionError catch (error) {
-      i = 1;
-    }
-    return i;
-  }
-
-  static unknown(var a) {
-    return (a) ? true : false;
-  }
-
-  static testUnknown() {
-    var x = unknown(false);
-    int i = 0;
-    try {
-      assert(x);
-    } on AssertionError catch (error) {
-      i = 1;
-    }
-    return i;
-  }
-
-  static testClosure() {
-    int i = 0;
-    try {
-      assert(() => false);
-    } on AssertionError catch (error) {
-      i = 1;
-    }
-    return i;
-  }
-
-  static testClosure2() {
-    int i = 0;
-    try {
-      var x = () => false;
-      assert(x);
-    } on AssertionError catch (error) {
-      i = 1;
-    }
-    return i;
-  }
-
-  static testMain() {
-    Expect.equals(0, testTrue());
-    Expect.equals(1, testFalse());
-    Expect.equals(1, testClosure());
-    Expect.equals(1, testClosure2());
-  }
-}
-
-main() {
-  AssertionTest.testMain();
-}