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describe :integer_modulo, shared: true do
context "fixnum" do
it "returns the modulus obtained from dividing self by the given argument" do
# test all possible combinations:
# - integer/double/bignum argument
# - positive/negative argument
# - positive/negative self
# - self greater/smaller than argument
13.send(@method, 4).should == 1
4.send(@method, 13).should == 4
13.send(@method, 4.0).should == 1
4.send(@method, 13.0).should == 4
(-200).send(@method, 256).should == 56
(-1000).send(@method, 512).should == 24
(-200).send(@method, -256).should == -200
(-1000).send(@method, -512).should == -488
(200).send(@method, -256).should == -56
(1000).send(@method, -512).should == -24
13.send(@method, -4.0).should == -3.0
4.send(@method, -13.0).should == -9.0
-13.send(@method, -4.0).should == -1.0
-4.send(@method, -13.0).should == -4.0
-13.send(@method, 4.0).should == 3.0
-4.send(@method, 13.0).should == 9.0
1.send(@method, 2.0).should == 1.0
200.send(@method, bignum_value).should == 200
4.send(@method, bignum_value(10)).should == 4
4.send(@method, -bignum_value(10)).should == -18446744073709551622
-4.send(@method, bignum_value(10)).should == 18446744073709551622
-4.send(@method, -bignum_value(10)).should == -4
end
it "raises a ZeroDivisionError when the given argument is 0" do
-> { 13.send(@method, 0) }.should raise_error(ZeroDivisionError)
-> { 0.send(@method, 0) }.should raise_error(ZeroDivisionError)
-> { -10.send(@method, 0) }.should raise_error(ZeroDivisionError)
end
it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
-> { 0.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
-> { 10.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
-> { -10.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
end
it "raises a TypeError when given a non-Integer" do
-> {
(obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
13.send(@method, obj)
}.should raise_error(TypeError)
-> { 13.send(@method, "10") }.should raise_error(TypeError)
-> { 13.send(@method, :symbol) }.should raise_error(TypeError)
end
end
context "bignum" do
before :each do
@bignum = bignum_value(10)
end
it "returns the modulus obtained from dividing self by the given argument" do
# test all possible combinations:
# - integer/double/bignum argument
# - positive/negative argument
# - positive/negative self
# - self greater/smaller than argument
@bignum.send(@method, 5).should == 1
@bignum.send(@method, -5).should == -4
(-@bignum).send(@method, 5).should == 4
(-@bignum).send(@method, -5).should == -1
@bignum.send(@method, 2.22).should be_close(1.5603603603605034, TOLERANCE)
@bignum.send(@method, -2.22).should be_close(-0.6596396396394968, TOLERANCE)
(-@bignum).send(@method, 2.22).should be_close(0.6596396396394968, TOLERANCE)
(-@bignum).send(@method, -2.22).should be_close(-1.5603603603605034, TOLERANCE)
@bignum.send(@method, @bignum + 10).should == 18446744073709551626
@bignum.send(@method, -(@bignum + 10)).should == -10
(-@bignum).send(@method, @bignum + 10).should == 10
(-@bignum).send(@method, -(@bignum + 10)).should == -18446744073709551626
(@bignum + 10).send(@method, @bignum).should == 10
(@bignum + 10).send(@method, -@bignum).should == -18446744073709551616
(-(@bignum + 10)).send(@method, @bignum).should == 18446744073709551616
(-(@bignum + 10)).send(@method, -@bignum).should == -10
end
it "raises a ZeroDivisionError when the given argument is 0" do
-> { @bignum.send(@method, 0) }.should raise_error(ZeroDivisionError)
-> { (-@bignum).send(@method, 0) }.should raise_error(ZeroDivisionError)
end
it "raises a ZeroDivisionError when the given argument is 0 and a Float" do
-> { @bignum.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
-> { -@bignum.send(@method, 0.0) }.should raise_error(ZeroDivisionError)
end
it "raises a TypeError when given a non-Integer" do
-> { @bignum.send(@method, mock('10')) }.should raise_error(TypeError)
-> { @bignum.send(@method, "10") }.should raise_error(TypeError)
-> { @bignum.send(@method, :symbol) }.should raise_error(TypeError)
end
end
end
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