blob: 39065fa3922451f9c0e0767d8a79eccb36dbe445 (
plain)
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
|
require_relative '../../spec_helper'
describe "Numeric#-@" do
it "returns the same value with opposite sign (integers)" do
0.send(:-@).should == 0
100.send(:-@).should == -100
-100.send(:-@).should == 100
end
it "returns the same value with opposite sign (floats)" do
34.56.send(:-@).should == -34.56
-34.56.send(:-@).should == 34.56
end
it "returns the same value with opposite sign (two complement)" do
2147483648.send(:-@).should == -2147483648
-2147483648.send(:-@).should == 2147483648
9223372036854775808.send(:-@).should == -9223372036854775808
-9223372036854775808.send(:-@).should == 9223372036854775808
end
describe "with a Numeric subclass" do
it "calls #coerce(0) on self, then subtracts the second element of the result from the first" do
ten = mock_numeric('10')
zero = mock_numeric('0')
ten.should_receive(:coerce).with(0).and_return([zero, ten])
zero.should_receive(:-).with(ten).and_return(-10)
ten.send(:-@).should == -10
end
end
end
|