diff options
Diffstat (limited to 'spec/rubyspec/core/numeric/uminus_spec.rb')
-rw-r--r-- | spec/rubyspec/core/numeric/uminus_spec.rb | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/spec/rubyspec/core/numeric/uminus_spec.rb b/spec/rubyspec/core/numeric/uminus_spec.rb new file mode 100644 index 0000000000..7385f5f599 --- /dev/null +++ b/spec/rubyspec/core/numeric/uminus_spec.rb @@ -0,0 +1,31 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Numeric#-@" do + it "returns the same value with opposite sign (integers)" do + 0.send(:-@).should == 0 + 100.send(:-@).should == -100 + -100.send(:-@).should == 100 + end + + it "returns the same value with opposite sign (floats)" do + 34.56.send(:-@).should == -34.56 + -34.56.send(:-@).should == 34.56 + end + + it "returns the same value with opposite sign (two complement)" do + 2147483648.send(:-@).should == -2147483648 + -2147483648.send(:-@).should == 2147483648 + 9223372036854775808.send(:-@).should == -9223372036854775808 + -9223372036854775808.send(:-@).should == 9223372036854775808 + end + + describe "with a Numeric subclass" do + it "calls #coerce(0) on self, then subtracts the second element of the result from the first" do + ten = mock_numeric('10') + zero = mock_numeric('0') + ten.should_receive(:coerce).with(0).and_return([zero, ten]) + zero.should_receive(:-).with(ten).and_return(-10) + ten.send(:-@).should == -10 + end + end +end |