blob: 1866f665cd326f6ed21f363ebd80fd206d7d9720 (
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
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
|
require_relative '../../spec_helper'
require 'bigdecimal'
describe "BigDecimal#remainder" do
before :each do
@zero = BigDecimal("0")
@one = BigDecimal("1")
@three = BigDecimal("3")
@mixed = BigDecimal("1.23456789")
@pos_int = BigDecimal("2E5555")
@neg_int = BigDecimal("-2E5555")
@pos_frac = BigDecimal("2E-9999")
@neg_frac = BigDecimal("-2E-9999")
@nan = BigDecimal("NaN")
@infinity = BigDecimal("Infinity")
@infinity_minus = BigDecimal("-Infinity")
@one_minus = BigDecimal("-1")
@frac_1 = BigDecimal("1E-99999")
@frac_2 = BigDecimal("0.9E-99999")
end
it "it equals modulo, if both values are of same sign" do
BigDecimal('1234567890123456789012345679').remainder(BigDecimal('1')).should == @zero
BigDecimal('123456789').remainder(BigDecimal('333333333333333333333333333E-50')).should == BigDecimal('0.12233333333333333333345679E-24')
@mixed.remainder(@pos_frac).should == @mixed % @pos_frac
@pos_int.remainder(@pos_frac).should == @pos_int % @pos_frac
@neg_frac.remainder(@neg_int).should == @neg_frac % @neg_int
@neg_int.remainder(@neg_frac).should == @neg_int % @neg_frac
end
it "means self-arg*(self/arg).truncate" do
@mixed.remainder(@neg_frac).should == @mixed - @neg_frac * (@mixed / @neg_frac).truncate
@pos_int.remainder(@neg_frac).should == @pos_int - @neg_frac * (@pos_int / @neg_frac).truncate
@neg_frac.remainder(@pos_int).should == @neg_frac - @pos_int * (@neg_frac / @pos_int).truncate
@neg_int.remainder(@pos_frac).should == @neg_int - @pos_frac * (@neg_int / @pos_frac).truncate
end
it "returns NaN used with zero" do
@mixed.remainder(@zero).should.nan?
@zero.remainder(@zero).should.nan?
end
it "returns zero if used on zero" do
@zero.remainder(@mixed).should == @zero
end
it "returns NaN if NaN is involved" do
@nan.remainder(@nan).should.nan?
@nan.remainder(@one).should.nan?
@one.remainder(@nan).should.nan?
@infinity.remainder(@nan).should.nan?
@nan.remainder(@infinity).should.nan?
end
it "returns NaN if Infinity is involved" do
@infinity.remainder(@infinity).should.nan?
@infinity.remainder(@one).should.nan?
@infinity.remainder(@mixed).should.nan?
@infinity.remainder(@one_minus).should.nan?
@infinity.remainder(@frac_1).should.nan?
@one.remainder(@infinity).should.nan?
@infinity_minus.remainder(@infinity_minus).should.nan?
@infinity_minus.remainder(@one).should.nan?
@one.remainder(@infinity_minus).should.nan?
@frac_2.remainder(@infinity_minus).should.nan?
@infinity.remainder(@infinity_minus).should.nan?
@infinity_minus.remainder(@infinity).should.nan?
end
it "coerces arguments to BigDecimal if possible" do
@three.remainder(2).should == @one
end
describe "with Object" do
it "tries to coerce the other operand to self" do
object = mock("Object")
object.should_receive(:coerce).with(@three).and_return([@three, 2])
@three.remainder(object).should == @one
end
end
it "raises TypeError if the argument cannot be coerced to BigDecimal" do
-> {
@one.remainder('2')
}.should raise_error(TypeError)
end
end
|
