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require 'spec_helper'
require 'mspec/expectations/expectations'
require 'mspec/matchers'
describe SignedZeroMatcher do
it "matches when actual is zero and has the correct sign" do
SignedZeroMatcher.new(1).matches?(0.0).should == true
SignedZeroMatcher.new(-1).matches?(-0.0).should == true
end
it "does not match when actual is non-zero" do
SignedZeroMatcher.new(1).matches?(1.0).should == false
SignedZeroMatcher.new(-1).matches?(-1.0).should == false
end
it "does not match when actual is zero but has the incorrect sign" do
SignedZeroMatcher.new(1).matches?(-0.0).should == false
SignedZeroMatcher.new(-1).matches?(0.0).should == false
end
it "provides a useful failure message" do
matcher = SignedZeroMatcher.new(-1)
matcher.matches?(0.0)
matcher.failure_message.should == ["Expected 0.0", "to be -0.0"]
end
it "provides a useful negative failure message" do
matcher = SignedZeroMatcher.new(-1)
matcher.matches?(-0.0)
matcher.negative_failure_message.should == ["Expected -0.0", "not to be -0.0"]
end
end
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