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Diffstat (limited to 'spec/ruby/core/integer/div_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/div_spec.rb | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/div_spec.rb b/spec/ruby/core/integer/div_spec.rb new file mode 100644 index 0000000000..99efedd483 --- /dev/null +++ b/spec/ruby/core/integer/div_spec.rb @@ -0,0 +1,138 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +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 Fixnum" 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 + lambda { 0.div(0.0) }.should raise_error(ZeroDivisionError) + lambda { 10.div(0.0) }.should raise_error(ZeroDivisionError) + lambda { -10.div(0.0) }.should raise_error(ZeroDivisionError) + end + + it "raises a ZeroDivisionError when the given argument is 0 and not a Float" do + lambda { 13.div(0) }.should raise_error(ZeroDivisionError) + lambda { 13.div(-0) }.should raise_error(ZeroDivisionError) + end + + it "raises a TypeError when given a non-numeric argument" do + lambda { 13.div(mock('10')) }.should raise_error(TypeError) + lambda { 5.div("2") }.should raise_error(TypeError) + lambda { 5.div(:"2") }.should raise_error(TypeError) + lambda { 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 == 2305843009213693974 + @bignum.div(Rational(4, 1)).should == 2305843009213693974 + @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 "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 + lambda { @bignum.div(mock("10")) }.should raise_error(TypeError) + lambda { @bignum.div("2") }.should raise_error(TypeError) + lambda { @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(2147483648) + not_supported_on :opal do + @bignum.div(4294967295.0).should eql(2147483648) + @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 + lambda { @bignum.div(0.0) }.should raise_error(ZeroDivisionError) + lambda { @bignum.div(-0.0) }.should raise_error(ZeroDivisionError) + end + + it "raises ZeroDivisionError if the argument is 0 and is not a Float" do + lambda { @bignum.div(0) }.should raise_error(ZeroDivisionError) + lambda { @bignum.div(-0) }.should raise_error(ZeroDivisionError) + end + end +end |