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require_relative '../../spec_helper'
require_relative 'shared/arithmetic_coerce'
describe "Integer#-" do
ruby_version_is "2.4"..."2.5" do
it_behaves_like :integer_arithmetic_coerce_rescue, :-
end
ruby_version_is "2.5" do
it_behaves_like :integer_arithmetic_coerce_not_rescue, :-
end
context "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 "raises a TypeError when given a non-Integer" do
-> {
(obj = mock('10')).should_receive(:to_int).any_number_of_times.and_return(10)
13 - obj
}.should raise_error(TypeError)
-> { 13 - "10" }.should raise_error(TypeError)
-> { 13 - :symbol }.should raise_error(TypeError)
end
end
context "bignum" do
before :each do
@bignum = bignum_value(314)
end
it "returns self minus the given Integer" do
(@bignum - 9).should == 9223372036854776113
(@bignum - 12.57).should be_close(9223372036854776109.43, TOLERANCE)
(@bignum - bignum_value(42)).should == 272
end
it "raises a TypeError when given a non-Integer" do
-> { @bignum - mock('10') }.should raise_error(TypeError)
-> { @bignum - "10" }.should raise_error(TypeError)
-> { @bignum - :symbol }.should raise_error(TypeError)
end
end
end
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