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32 lines
1 KiB
Ruby
32 lines
1 KiB
Ruby
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require File.expand_path('../../../spec_helper', __FILE__)
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describe "Numeric#-@" do
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it "returns the same value with opposite sign (integers)" do
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0.send(:-@).should == 0
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100.send(:-@).should == -100
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-100.send(:-@).should == 100
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end
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it "returns the same value with opposite sign (floats)" do
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34.56.send(:-@).should == -34.56
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-34.56.send(:-@).should == 34.56
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end
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it "returns the same value with opposite sign (two complement)" do
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2147483648.send(:-@).should == -2147483648
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-2147483648.send(:-@).should == 2147483648
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9223372036854775808.send(:-@).should == -9223372036854775808
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-9223372036854775808.send(:-@).should == 9223372036854775808
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end
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describe "with a Numeric subclass" do
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it "calls #coerce(0) on self, then subtracts the second element of the result from the first" do
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ten = mock_numeric('10')
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zero = mock_numeric('0')
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ten.should_receive(:coerce).with(0).and_return([zero, ten])
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zero.should_receive(:-).with(ten).and_return(-10)
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ten.send(:-@).should == -10
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end
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end
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end
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