1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
ruby_version_is "1.9" do
describe "Hash#compare_by_identity" do
before(:each) do
@h = new_hash
@idh = new_hash.compare_by_identity
end
it "causes future comparisons on the receiver to be made by identity" do
@h["a"] = :a
@h["a"].should == :a
@h.compare_by_identity
@h["a"].should be_nil
end
it "causes #compare_by_identity? to return true" do
@idh.compare_by_identity?.should be_true
end
it "returns self" do
h = new_hash
h[:foo] = :bar
h.compare_by_identity.should == h
end
it "uses the semantics of BasicObject#equal? to determine key identity" do
-0.0.should_not equal(-0.0) # -0.0 is not flonum
@idh[-0.0] = :a
@idh[-0.0] = :b
[1].should_not equal([1])
@idh[[1]] = :c
@idh[[1]] = :d
:bar.should equal(:bar)
@idh[:bar] = :e
@idh[:bar] = :f
"bar".should_not equal('bar')
@idh["bar"] = :g
@idh["bar"] = :h
@idh.values.should == [:a, :b, :c, :d, :f, :g, :h]
end
it "uses #equal? semantics, but doesn't actually call #equal? to determine identity" do
obj = mock('equal')
obj.should_not_receive(:equal?)
@idh[:foo] = :glark
@idh[obj] = :a
@idh[obj].should == :a
end
it "regards #dup'd objects as having different identities" do
str = 'foo'
@idh[str.dup] = :str
@idh[str].should be_nil
end
it "regards #clone'd objects as having different identities" do
str = 'foo'
@idh[str.clone] = :str
@idh[str].should be_nil
end
it "regards references to the same object as having the same identity" do
o = Object.new
@h[o] = :o
@h[:a] = :a
@h[o].should == :o
end
it "raises a RuntimeError on frozen hashes" do
@h = @h.freeze
lambda { @h.compare_by_identity }.should raise_error(RuntimeError)
end
# Behaviour confirmed in bug #1871
it "perists over #dups" do
@idh['foo'] = :bar
@idh['foo'] = :glark
@idh.dup.should == @idh
@idh.dup.size.should == @idh.size
end
it "persists over #clones" do
@idh['foo'] = :bar
@idh['foo'] = :glark
@idh.clone.should == @idh
@idh.clone.size.should == @idh.size
end
end
describe "Hash#compare_by_identity?" do
it "returns false by default" do
h = new_hash
h.compare_by_identity?.should be_false
end
it "returns true once #compare_by_identity has been invoked on self" do
h = new_hash
h.compare_by_identity
h.compare_by_identity?.should be_true
end
it "returns true when called multiple times on the same ident hash" do
h = new_hash
h.compare_by_identity
h.compare_by_identity?.should be_true
h.compare_by_identity?.should be_true
h.compare_by_identity?.should be_true
end
end
end
|
