2018-03-04 10:09:32 -05:00
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require_relative '../../spec_helper'
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2018-01-29 11:08:16 -05:00
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describe "Integer#div" do
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context "fixnum" do
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it "returns self divided by the given argument as an Integer" do
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2.div(2).should == 1
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1.div(2).should == 0
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5.div(2).should == 2
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end
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it "rounds towards -inf" do
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8192.div(10).should == 819
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8192.div(-10).should == -820
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(-8192).div(10).should == -820
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(-8192).div(-10).should == 819
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end
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it "means (x / y).floor" do
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5.div(2).should == (5 / 2).floor
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5.div(2.0).should == (5 / 2.0).floor
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5.div(-2).should == (5 / -2).floor
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5.div(100).should == (5 / 100).floor
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5.div(100.0).should == (5 / 100.0).floor
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5.div(-100).should == (5 / -100).floor
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end
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it "calls #coerce and #div if argument responds to #coerce" do
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x = mock("x")
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y = mock("y")
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result = mock("result")
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y.should_receive(:coerce).and_return([x, y])
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x.should_receive(:div).with(y).and_return(result)
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10.div(y).should == result
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end
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it "coerces self and the given argument to Floats and returns self divided by other as Fixnum" do
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1.div(0.2).should == 5
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1.div(0.16).should == 6
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1.div(0.169).should == 5
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-1.div(50.4).should == -1
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1.div(bignum_value).should == 0
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1.div(Rational(1, 5)).should == 5
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end
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it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
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lambda { 0.div(0.0) }.should raise_error(ZeroDivisionError)
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lambda { 10.div(0.0) }.should raise_error(ZeroDivisionError)
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lambda { -10.div(0.0) }.should raise_error(ZeroDivisionError)
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end
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it "raises a ZeroDivisionError when the given argument is 0 and not a Float" do
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lambda { 13.div(0) }.should raise_error(ZeroDivisionError)
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lambda { 13.div(-0) }.should raise_error(ZeroDivisionError)
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end
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it "raises a TypeError when given a non-numeric argument" do
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lambda { 13.div(mock('10')) }.should raise_error(TypeError)
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lambda { 5.div("2") }.should raise_error(TypeError)
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lambda { 5.div(:"2") }.should raise_error(TypeError)
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lambda { 5.div([]) }.should raise_error(TypeError)
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end
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end
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context "bignum" do
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before :each do
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@bignum = bignum_value(88)
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end
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it "returns self divided by other" do
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@bignum.div(4).should == 2305843009213693974
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@bignum.div(Rational(4, 1)).should == 2305843009213693974
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@bignum.div(bignum_value(2)).should == 1
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(-(10**50)).div(-(10**40 + 1)).should == 9999999999
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(10**50).div(10**40 + 1).should == 9999999999
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(-10**50).div(10**40 + 1).should == -10000000000
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(10**50).div(-(10**40 + 1)).should == -10000000000
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end
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it "calls #coerce and #div if argument responds to #coerce" do
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x = mock("x")
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y = mock("y")
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result = mock("result")
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y.should_receive(:coerce).and_return([x, y])
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x.should_receive(:div).with(y).and_return(result)
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@bignum.div(y).should == result
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end
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it "means (x / y).floor" do
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@bignum.div(2).should == (@bignum / 2).floor
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@bignum.div(-2).should == (@bignum / -2).floor
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@bignum.div(@bignum+1).should == (@bignum / (@bignum+1)).floor
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@bignum.div(-(@bignum+1)).should == (@bignum / -(@bignum+1)).floor
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@bignum.div(2.0).should == (@bignum / 2.0).floor
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@bignum.div(100.0).should == (@bignum / 100.0).floor
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end
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it "looses precision if passed Float argument" do
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@bignum.div(1).should_not == @bignum.div(1.0)
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@bignum.div(4).should_not == @bignum.div(4.0)
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@bignum.div(21).should_not == @bignum.div(21.0)
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end
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it "raises a TypeError when given a non-numeric" do
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lambda { @bignum.div(mock("10")) }.should raise_error(TypeError)
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lambda { @bignum.div("2") }.should raise_error(TypeError)
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lambda { @bignum.div(:symbol) }.should raise_error(TypeError)
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end
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it "returns a result of integer division of self by a float argument" do
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@bignum.div(4294967295.5).should eql(2147483648)
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not_supported_on :opal do
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@bignum.div(4294967295.0).should eql(2147483648)
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@bignum.div(bignum_value(88).to_f).should eql(1)
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@bignum.div(-bignum_value(88).to_f).should eql(-1)
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end
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end
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# #5490
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it "raises ZeroDivisionError if the argument is 0 and is a Float" do
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lambda { @bignum.div(0.0) }.should raise_error(ZeroDivisionError)
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lambda { @bignum.div(-0.0) }.should raise_error(ZeroDivisionError)
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end
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it "raises ZeroDivisionError if the argument is 0 and is not a Float" do
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lambda { @bignum.div(0) }.should raise_error(ZeroDivisionError)
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lambda { @bignum.div(-0) }.should raise_error(ZeroDivisionError)
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end
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end
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end
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