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