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require File.expand_path('../../../spec_helper', __FILE__)
describe "Fixnum#-" do
it "returns self minus the given Integer" do
(5 - 10).should == -5
(9237212 - 5_280).should == 9231932
(781 - 0.5).should == 780.5
(2_560_496 - bignum_value).should == -9223372036852215312
end
it "returns a Bignum only if the result is too large to be a Fixnum" do
(5 - 10).should be_an_instance_of Fixnum
(-1 - bignum_value).should be_an_instance_of Bignum
bignum_zero = bignum_value.coerce(0).first
(1 - bignum_zero).should be_an_instance_of Fixnum
(fixnum_min - 1).should be_an_instance_of(Bignum)
end
it "raises a TypeError when given a non-Integer" do
lambda {
(obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
13 - obj
}.should raise_error(TypeError)
lambda { 13 - "10" }.should raise_error(TypeError)
lambda { 13 - :symbol }.should raise_error(TypeError)
end
end
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