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require File.expand_path('../../../spec_helper', __FILE__)
describe "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
lambda { @bignum - mock('10') }.should raise_error(TypeError)
lambda { @bignum - "10" }.should raise_error(TypeError)
lambda { @bignum - :symbol }.should raise_error(TypeError)
end
end
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