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Side by Side Diff: tests/language/list_literal3_test.dart

Issue 11361190: a === b -> identical(a, b) (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Address comments. Created 8 years, 1 month ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 // Check that arrays from const array literals are immutable. 4 // Check that arrays from const array literals are immutable.
5 5
6 class ListLiteral3Test { 6 class ListLiteral3Test {
7 7
8 static const List<String> canonicalJoke = const ["knock", "knock"]; 8 static const List<String> canonicalJoke = const ["knock", "knock"];
9 9
10 static testMain() { 10 static testMain() {
11 11
12 List<String> joke = const ["knock", "knock"]; 12 List<String> joke = const ["knock", "knock"];
13 // Elements of canonical lists are canonicalized. 13 // Elements of canonical lists are canonicalized.
14 Expect.equals(true, joke === canonicalJoke); 14 Expect.identical(joke, canonicalJoke);
15 Expect.equals(true, joke[0] === joke[1]); 15 Expect.identical(joke[0], joke[1]);
16 Expect.equals(true, joke[0] === canonicalJoke[0]); 16 Expect.identical(joke[0], canonicalJoke[0]);
17 17
18 // Lists from literals are immutable. 18 // Lists from literals are immutable.
19 bool caughtException = false; 19 Expect.throws(() { joke[0] = "sock"; }, (e) => e is UnsupportedError);
20 try { 20 Expect.identical(joke[0], joke[1]);
21 joke[0] = "sock";
22 } on UnsupportedError catch (e) {
23 caughtException = true;
24 }
25 Expect.equals(true, caughtException);
26 Expect.equals(true, joke[0] === joke[1]);
27 21
28 // Make sure lists allocated at runtime are mutable and are 22 // Make sure lists allocated at runtime are mutable and are
29 // not canonicalized. 23 // not canonicalized.
30 List<String> lame_joke = ["knock", "knock"]; // Invokes operator new. 24 List<String> lame_joke = ["knock", "knock"]; // Invokes operator new.
31 Expect.equals(true, joke[1] === lame_joke[1]); 25 Expect.identical(joke[1], lame_joke[1]);
32 // Operator new creates a mutable list. 26 // Operator new creates a mutable list.
33 Expect.equals(false, joke === lame_joke); 27 Expect.equals(false, identical(joke, lame_joke));
34 lame_joke[1] = "who"; 28 lame_joke[1] = "who";
35 Expect.equals(true, "who" === lame_joke[1]); 29 Expect.identical("who", lame_joke[1]);
36 30
37 // Elements of canonical lists are canonicalized. 31 // Elements of canonical lists are canonicalized.
38 List<List<int>> a = const <List<int>>[ const [1, 2], const [1, 2]]; 32 List<List<int>> a = const <List<int>>[ const [1, 2], const [1, 2]];
39 Expect.equals(true, a[0] === a[1]); 33 Expect.identical(a[0], a[1]);
40 Expect.equals(true, a[0][0] === a[1][0]); 34 Expect.identical(a[0][0], a[1][0]);
41 try { 35 Expect.throws(() { a[0][0] = 42; }, (e) => e is UnsupportedError);
42 caughtException = false;
43 a[0][0] = 42;
44 } on UnsupportedError catch (e) {
45 caughtException = true;
46 }
47 Expect.equals(true, caughtException);
48 36
49 List<List<double>> b = const [ const [1.0, 2.0], const [1.0, 2.0]]; 37 List<List<double>> b = const [ const [1.0, 2.0], const [1.0, 2.0]];
50 Expect.equals(true, b[0] === b[1]); 38 Expect.identical(b[0], b[1]);
51 Expect.equals(true, b[0][0] === 1.0); 39 Expect.equals(true, b[0][0] == 1.0);
52 Expect.equals(true, b[0][0] === b[1][0]); 40 Expect.identical(b[0][0], b[1][0]);
53 try { 41 Expect.throws(() { b[0][0] = 42.0; }, (e) => e is UnsupportedError);
54 caughtException = false;
55 b[0][0] = 42.0;
56 } on UnsupportedError catch (e) {
57 caughtException = true;
58 }
59 Expect.equals(true, caughtException);
60 } 42 }
61 } 43 }
62 44
63 main() { 45 main() {
64 ListLiteral3Test.testMain(); 46 ListLiteral3Test.testMain();
65 } 47 }
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