diff options
Diffstat (limited to 'spec/mspec/lib/mspec/matchers/signed_zero.rb')
-rw-r--r-- | spec/mspec/lib/mspec/matchers/signed_zero.rb | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/spec/mspec/lib/mspec/matchers/signed_zero.rb b/spec/mspec/lib/mspec/matchers/signed_zero.rb new file mode 100644 index 0000000000..3fd1472fc8 --- /dev/null +++ b/spec/mspec/lib/mspec/matchers/signed_zero.rb @@ -0,0 +1,28 @@ +class SignedZeroMatcher + def initialize(expected_sign) + @expected_sign = expected_sign + end + + def matches?(actual) + @actual = actual + (1.0/actual).infinite? == @expected_sign + end + + def failure_message + ["Expected #{@actual}", "to be #{"-" if @expected_sign == -1}0.0"] + end + + def negative_failure_message + ["Expected #{@actual}", "not to be #{"-" if @expected_sign == -1}0.0"] + end +end + +class Object + def be_positive_zero + SignedZeroMatcher.new(1) + end + + def be_negative_zero + SignedZeroMatcher.new(-1) + end +end |