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// 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.
import "package:expect/expect.dart";
// Test that a final list literal is not expandable nor modifiable.
class ConstListLiteralTest {
static void testMain() {
var list = const [4, 2, 3];
Expect.equals(3, list.length);
var exception = null;
try {
list.add(4);
} on UnsupportedError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(3, list.length);
exception = null;
exception = null;
try {
list.addAll([4, 5]);
} on UnsupportedError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(3, list.length);
exception = null;
try {
list[0] = 0;
} on UnsupportedError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(3, list.length);
exception = null;
try {
list.sort((a, b) => a - b);
} on UnsupportedError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(3, list.length);
Expect.equals(4, list[0]);
Expect.equals(2, list[1]);
Expect.equals(3, list[2]);
exception = null;
try {
list.setRange(0, 1, [1], 0);
} on UnsupportedError catch (e) {
exception = e;
}
Expect.equals(true, exception != null);
Expect.equals(3, list.length);
Expect.equals(4, list[0]);
Expect.equals(2, list[1]);
Expect.equals(3, list[2]);
// Note: the next check is a regression test for dart2js. The immutable list
// overrides the 'length' property of List, but relies on using the native
// 'forEach' construct in Array. This test ensures that our strategy works
// correctly.
int x = 0;
list.forEach((e) {
x += e;
});
Expect.equals(9, x);
}
}
main() {
ConstListLiteralTest.testMain();
}