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require File.expand_path('../../../spec_helper', __FILE__)
describe "Bignum#divmod" do
before :each do
@bignum = bignum_value(55)
end
# Based on MRI's test/test_integer.rb (test_divmod),
# MRI maintains the following property:
# if q, r = a.divmod(b) ==>
# assert(0 < b ? (0 <= r && r < b) : (b < r && r <= 0))
# So, r is always between 0 and b.
it "returns an Array containing quotient and modulus obtained from dividing self by the given argument" do
@bignum.divmod(4).should == [2305843009213693965, 3]
@bignum.divmod(13).should == [709490156681136604, 11]
@bignum.divmod(4.5).should == [2049638230412172288, 3.5]
not_supported_on :opal do
@bignum.divmod(4.0).should == [2305843009213693952, 0.0]
@bignum.divmod(13.0).should == [709490156681136640, 8.0]
@bignum.divmod(2.0).should == [4611686018427387904, 0.0]
end
@bignum.divmod(bignum_value).should == [1, 55]
(-(10**50)).divmod(-(10**40 + 1)).should == [9999999999, -9999999999999999999999999999990000000001]
(10**50).divmod(10**40 + 1).should == [9999999999, 9999999999999999999999999999990000000001]
(-10**50).divmod(10**40 + 1).should == [-10000000000, 10000000000]
(10**50).divmod(-(10**40 + 1)).should == [-10000000000, -10000000000]
end
describe "with q = floor(x/y), a = q*b + r," do
it "returns [q,r] when a < 0, b > 0 and |a| < b" do
a = -@bignum + 1
b = @bignum
a.divmod(b).should == [-1, 1]
end
it "returns [q,r] when a > 0, b < 0 and a > |b|" do
b = -@bignum + 1
a = @bignum
a.divmod(b).should == [-2, -@bignum + 2]
end
it "returns [q,r] when a > 0, b < 0 and a < |b|" do
a = @bignum - 1
b = -@bignum
a.divmod(b).should == [-1, -1]
end
it "returns [q,r] when a < 0, b < 0 and |a| < |b|" do
a = -@bignum + 1
b = -@bignum
a.divmod(b).should == [0, -@bignum + 1]
end
end
it "raises a ZeroDivisionError when the given argument is 0" do
lambda { @bignum.divmod(0) }.should raise_error(ZeroDivisionError)
lambda { (-@bignum).divmod(0) }.should raise_error(ZeroDivisionError)
end
# Behaviour established as correct in r23953
it "raises a FloatDomainError if other is NaN" do
lambda { @bignum.divmod(nan_value) }.should raise_error(FloatDomainError)
end
it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
lambda { @bignum.divmod(0.0) }.should raise_error(ZeroDivisionError)
lambda { (-@bignum).divmod(0.0) }.should raise_error(ZeroDivisionError)
end
it "raises a TypeError when the given argument is not an Integer" do
lambda { @bignum.divmod(mock('10')) }.should raise_error(TypeError)
lambda { @bignum.divmod("10") }.should raise_error(TypeError)
lambda { @bignum.divmod(:symbol) }.should raise_error(TypeError)
end
end
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