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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../shared/modulo', __FILE__)
require 'bigdecimal'
module DivmodSpecs
def self.check_both_nan(array)
array.length.should == 2
array[0].nan?.should == true
array[1].nan?.should == true
end
def self.check_both_bigdecimal(array)
array.length.should == 2
array[0].kind_of?(BigDecimal).should == true
array[1].kind_of?(BigDecimal).should == true
end
end
# TODO: figure out a way to do the shared specs with helpers instead
# of spec'ing a method that does not really exist
describe "BigDecimal#mod_part_of_divmod" do
# BigDecimal#divmod[1] behaves exactly like #modulo
before :all do
class BigDecimal
def mod_part_of_divmod(arg)
divmod(arg)[1]
end
end
end
after :all do
class BigDecimal
undef mod_part_of_divmod
end
end
it_behaves_like :bigdecimal_modulo, :mod_part_of_divmod
ruby_version_is "" ... "1.9" do
it "does NOT raise ZeroDivisionError if other is zero" do
bd6543 = BigDecimal.new("6543.21")
bd5667 = BigDecimal.new("5667.19")
a = BigDecimal("1.0000000000000000000000000000000000000000005")
b = BigDecimal("1.00000000000000000000000000000000000000000005")
bd5667.send(@method, 0).nan?.should == true
bd5667.send(@method, BigDecimal("0")).nan?.should == true
@zero.send(@method, @zero).nan?.should == true
end
end
ruby_version_is "1.9" do
it "raises ZeroDivisionError if other is zero" do
bd6543 = BigDecimal.new("6543.21")
bd5667 = BigDecimal.new("5667.19")
a = BigDecimal("1.0000000000000000000000000000000000000000005")
b = BigDecimal("1.00000000000000000000000000000000000000000005")
lambda { bd5667.send(@method, 0) }.should raise_error(ZeroDivisionError)
lambda { bd5667.send(@method, BigDecimal("0")) }.should raise_error(ZeroDivisionError)
lambda { @zero.send(@method, @zero) }.should raise_error(ZeroDivisionError)
end
end
end
describe "BigDecimal#divmod" do
before(:each) do
@a = BigDecimal("42.00000000000000000001")
@zero = BigDecimal("0")
@zero_pos = BigDecimal("+0")
@zero_neg = BigDecimal("-0")
@one = BigDecimal("1")
@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")
@special_vals = [@infinity, @infinity_minus, @nan]
@regular_vals = [
@one, @mixed, @pos_int, @neg_int, @pos_frac,
@neg_frac, @one_minus, @frac_1, @frac_2]
@zeroes = [@zero, @zero_pos, @zero_neg]
end
it "divides value, returns an array" do
res = @a.divmod(5)
res.kind_of?(Array).should == true
end
it "array contains quotient and modulus as BigDecimal" do
res = @a.divmod(5)
DivmodSpecs::check_both_bigdecimal(res)
res[0].should == BigDecimal('0.8E1')
res[1].should == BigDecimal('2.00000000000000000001')
BigDecimal('1').divmod(BigDecimal('2')).should == [0, 1]
BigDecimal('2').divmod(BigDecimal('1')).should == [2, 0]
BigDecimal('1').divmod(BigDecimal('-2')).should == [-1, -1]
BigDecimal('2').divmod(BigDecimal('-1')).should == [-2, 0]
BigDecimal('-1').divmod(BigDecimal('2')).should == [-1, 1]
BigDecimal('-2').divmod(BigDecimal('1')).should == [-2, 0]
end
it "Can be reversed with * and +" do
# Example taken from BigDecimal documentation
a = BigDecimal.new("42")
b = BigDecimal.new("9")
q, m = a.divmod(b)
c = q * b + m
a.should == c
values = [@one, @one_minus, BigDecimal('2'), BigDecimal('-2'),
BigDecimal('5'), BigDecimal('-5'), BigDecimal('10'), BigDecimal('-10'),
BigDecimal('20'), BigDecimal('-20'), BigDecimal('100'), BigDecimal('-100'),
BigDecimal('1.23456789E10'), BigDecimal('-1.23456789E10')
]
# TODO: file MRI bug:
# BigDecimal('1').divmod(BigDecimal('3E-9'))[0] #=> 0.3E9,
# but really should be 0.333333333E9
ruby_bug "#206", "1.8" do #MRI's precision is very low in some cases
values << BigDecimal('1E-10')
values << BigDecimal('-1E-10')
values << BigDecimal('2E55')
values << BigDecimal('-2E55')
values << BigDecimal('2E-5555')
values << BigDecimal('-2E-5555')
# not quite sure what changed since 1.7.19 that is breaking this:
#values_and_zeroes = values + @zeroes
#values_and_zeroes.each do |val1|
# values.each do |val2|
# res = val1.divmod(val2)
# DivmodSpecs::check_both_bigdecimal(res)
# res[0].should == ((val1/val2).floor)
# res[1].should == (val1 - res[0] * val2)
# end
#end
end
end
ruby_version_is "" ... "1.9" do
it "properly handles special values" do
values = @special_vals + @zeroes
values.each do |val1|
values.each do |val2|
DivmodSpecs::check_both_nan(val1.divmod(val2))
end
end
@special_vals.each do |val1|
@regular_vals.each do |val2|
DivmodSpecs::check_both_nan(val1.divmod(val2))
end
end
@regular_vals.each do |val1|
@special_vals.each do |val2|
DivmodSpecs::check_both_nan(val1.divmod(val2))
end
end
end
it "returns an array of two NaNs if the argument is zero" do
values = @regular_vals + @special_vals
values.each do |val1|
@zeroes.each do |val2|
DivmodSpecs::check_both_nan(val1.divmod(val2))
end
end
end
end
ruby_version_is "1.9" do
it "returns an array of two NaNs if NaN is involved" do
(@special_vals + @regular_vals + @zeroes).each do |val|
DivmodSpecs::check_both_nan(val.divmod(@nan))
DivmodSpecs::check_both_nan(@nan.divmod(val))
end
end
it "raises ZeroDivisionError if the divisor is zero" do
(@special_vals + @regular_vals + @zeroes - [@nan]).each do |val|
@zeroes.each do |zero|
lambda { val.divmod(zero) }.should raise_error(ZeroDivisionError)
end
end
end
it "returns an array of Infinity and NaN if the dividend is Infinity" do
@regular_vals.each do |val|
array = @infinity.divmod(val)
array.length.should == 2
array[0].infinite?.should == (val > 0 ? 1 : -1)
array[1].nan?.should == true
end
end
it "returns an array of zero and the dividend if the divisor is Infinity" do
@regular_vals.each do |val|
array = val.divmod(@infinity)
array.length.should == 2
array[0].should == @zero
array[1].should == val
end
end
it "returns an array of two zero if the diviend is zero" do
@zeroes.each do |zero|
@regular_vals.each do |val|
zero.divmod(val).should == [@zero, @zero]
end
end
end
end
it "raises TypeError if the argument cannot be coerced to BigDecimal" do
lambda {
@one.divmod('1')
}.should raise_error(TypeError)
end
end
|
