| // Copyright (c) 2020, 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. |
| // @dart=2.9 |
| class Foo { |
| final int x; |
| const Foo(this.x) |
| : assert(x > 0, "x is not positive"), |
| assert(x > 0), |
| assert(x > 0, ""), |
| assert(const bool.fromEnvironment("foo") == false, |
| "foo was ${const bool.fromEnvironment("foo")}"), |
| assert(const bool.fromEnvironment("foo") == false); |
| const Foo.withMessage(this.x) |
| : assert(x < 0, "btw foo was ${const bool.fromEnvironment("foo")}"); |
| const Foo.withInvalidMessage(this.x) : assert(x < 0, x); |
| const Foo.withInvalidCondition(this.x) : assert(x); |
| const Foo.withNullConditionFromEnv1(this.x) |
| : assert(bool.fromEnvironment("foo", defaultValue: null)); |
| const Foo.withNullConditionFromEnv2(this.x) |
| : assert(const bool.fromEnvironment("foo", defaultValue: null)); |
| } |
| |
| class Bar { |
| final int x; |
| const Bar.withMessage(this.x) : assert(x < 0, "x is not negative"); |
| const Bar.withoutMessage(this.x) : assert(x < 0); |
| const Bar.withEmptyMessage(this.x) : assert(x < 0); |
| } |
| |
| const Foo foo1 = const Foo(1); |
| const Foo foo2 = const Foo(0); |
| const Foo foo3 = const Foo.withMessage(42); |
| const Foo foo4 = const Foo.withInvalidMessage(42); |
| const Foo foo5 = const Foo.withInvalidCondition(42); |
| const Foo foo6 = const Foo.withNullConditionFromEnv1(42); |
| const Foo foo7 = const Foo.withNullConditionFromEnv2(42); |
| const Bar bar1 = const Bar.withMessage(1); |
| const Bar bar2 = const Bar.withMessage(0); |
| const Bar bar3 = const Bar.withoutMessage(1); |
| const Bar bar4 = const Bar.withoutMessage(0); |
| const Bar bar5 = const Bar.withEmptyMessage(1); |
| const Bar bar6 = const Bar.withEmptyMessage(0); |
| |
| main() { |
| print(foo1); |
| } |