mirror-number.js revision 053d10c438f14580aaf4ab1b2aad93a5a4fe8b82 
1// Copyright 2008 the V8 project authors. All rights reserved.
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27
28// Flags: --expose-debug-as debug
29// Test the mirror object for number values
30
31function testNumberMirror(n) {
32  // Create mirror and JSON representation.
33  var mirror = debug.MakeMirror(n);
34  var serializer = debug.MakeMirrorSerializer();
35  var json = JSON.stringify(serializer.serializeValue(mirror));
36
37  // Check the mirror hierachy.
38  assertTrue(mirror instanceof debug.Mirror);
39  assertTrue(mirror instanceof debug.ValueMirror);
40  assertTrue(mirror instanceof debug.NumberMirror);
41
42  // Check the mirror properties.
43  assertTrue(mirror.isNumber());
44  assertEquals('number', mirror.type());
45  assertTrue(mirror.isPrimitive());
46
47  // Test text representation
48  assertEquals(String(n), mirror.toText());
49
50  // Parse JSON representation and check.
51  var fromJSON = eval('(' + json + ')');
52  assertEquals('number', fromJSON.type);
53  if (!isNaN(n)) {
54    assertEquals(n, fromJSON.value);
55  } else {
56    // NaN values are encoded as strings.
57    assertTrue(typeof fromJSON.value == 'string');
58    if (n === Infinity) {
59      assertEquals('Infinity', fromJSON.value);
60    } else if (n === -Infinity) {
61      assertEquals('-Infinity', fromJSON.value);
62    } else {
63      assertEquals('NaN', fromJSON.value);
64    }
65  }
66}
67
68
69// Test a number of different numbers.
70testNumberMirror(-7);
71testNumberMirror(-6.5);
72testNumberMirror(0);
73testNumberMirror(42);
74testNumberMirror(100.0002);
75testNumberMirror(Infinity);
76testNumberMirror(-Infinity);
77testNumberMirror(NaN);
78