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require_relative '../../spec_helper'
describe "Integer#div" do
context "fixnum" do
it "returns self divided by the given argument as an Integer" do
2.div(2).should == 1
1.div(2).should == 0
5.div(2).should == 2
end
it "rounds towards -inf" do
8192.div(10).should == 819
8192.div(-10).should == -820
(-8192).div(10).should == -820
(-8192).div(-10).should == 819
end
it "means (x / y).floor" do
5.div(2).should == (5 / 2).floor
5.div(2.0).should == (5 / 2.0).floor
5.div(-2).should == (5 / -2).floor
5.div(100).should == (5 / 100).floor
5.div(100.0).should == (5 / 100.0).floor
5.div(-100).should == (5 / -100).floor
end
it "calls #coerce and #div if argument responds to #coerce" do
x = mock("x")
y = mock("y")
result = mock("result")
y.should_receive(:coerce).and_return([x, y])
x.should_receive(:div).with(y).and_return(result)
10.div(y).should == result
end
it "coerces self and the given argument to Floats and returns self divided by other as Integer" do
1.div(0.2).should == 5
1.div(0.16).should == 6
1.div(0.169).should == 5
-1.div(50.4).should == -1
1.div(bignum_value).should == 0
1.div(Rational(1, 5)).should == 5
end
it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
-> { 0.div(0.0) }.should raise_error(ZeroDivisionError)
-> { 10.div(0.0) }.should raise_error(ZeroDivisionError)
-> { -10.div(0.0) }.should raise_error(ZeroDivisionError)
end
it "raises a ZeroDivisionError when the given argument is 0 and not a Float" do
-> { 13.div(0) }.should raise_error(ZeroDivisionError)
-> { 13.div(-0) }.should raise_error(ZeroDivisionError)
end
it "raises a TypeError when given a non-numeric argument" do
-> { 13.div(mock('10')) }.should raise_error(TypeError)
-> { 5.div("2") }.should raise_error(TypeError)
-> { 5.div(:"2") }.should raise_error(TypeError)
-> { 5.div([]) }.should raise_error(TypeError)
end
end
context "bignum" do
before :each do
@bignum = bignum_value(88)
end
it "returns self divided by other" do
@bignum.div(4).should == 4611686018427387926
@bignum.div(Rational(4, 1)).should == 4611686018427387926
@bignum.div(bignum_value(2)).should == 1
(-(10**50)).div(-(10**40 + 1)).should == 9999999999
(10**50).div(10**40 + 1).should == 9999999999
(-10**50).div(10**40 + 1).should == -10000000000
(10**50).div(-(10**40 + 1)).should == -10000000000
end
it "handles fixnum_min / -1" do
(fixnum_min / -1).should == -fixnum_min
(fixnum_min / -1).should > 0
int_min = -2147483648
(int_min / -1).should == 2147483648
end
it "calls #coerce and #div if argument responds to #coerce" do
x = mock("x")
y = mock("y")
result = mock("result")
y.should_receive(:coerce).and_return([x, y])
x.should_receive(:div).with(y).and_return(result)
@bignum.div(y).should == result
end
it "means (x / y).floor" do
@bignum.div(2).should == (@bignum / 2).floor
@bignum.div(-2).should == (@bignum / -2).floor
@bignum.div(@bignum+1).should == (@bignum / (@bignum+1)).floor
@bignum.div(-(@bignum+1)).should == (@bignum / -(@bignum+1)).floor
@bignum.div(2.0).should == (@bignum / 2.0).floor
@bignum.div(100.0).should == (@bignum / 100.0).floor
end
it "looses precision if passed Float argument" do
@bignum.div(1).should_not == @bignum.div(1.0)
@bignum.div(4).should_not == @bignum.div(4.0)
@bignum.div(21).should_not == @bignum.div(21.0)
end
it "raises a TypeError when given a non-numeric" do
-> { @bignum.div(mock("10")) }.should raise_error(TypeError)
-> { @bignum.div("2") }.should raise_error(TypeError)
-> { @bignum.div(:symbol) }.should raise_error(TypeError)
end
it "returns a result of integer division of self by a float argument" do
@bignum.div(4294967295.5).should eql(4294967296)
not_supported_on :opal do
@bignum.div(4294967295.0).should eql(4294967297)
@bignum.div(bignum_value(88).to_f).should eql(1)
@bignum.div((-bignum_value(88)).to_f).should eql(-1)
end
end
# #5490
it "raises ZeroDivisionError if the argument is 0 and is a Float" do
-> { @bignum.div(0.0) }.should raise_error(ZeroDivisionError)
-> { @bignum.div(-0.0) }.should raise_error(ZeroDivisionError)
end
it "raises ZeroDivisionError if the argument is 0 and is not a Float" do
-> { @bignum.div(0) }.should raise_error(ZeroDivisionError)
-> { @bignum.div(-0) }.should raise_error(ZeroDivisionError)
end
end
end
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