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require 'spec_helper'
require 'mspec/expectations/expectations'
require 'mspec/guards'
require 'mspec/helpers'
require 'mspec/matchers'
describe BeNaNMatcher do
it "matches when actual is NaN" do
BeNaNMatcher.new.matches?(nan_value).should == true
end
it "does not match when actual is not NaN" do
BeNaNMatcher.new.matches?(1.0).should == false
BeNaNMatcher.new.matches?(0).should == false
end
it "provides a useful failure message" do
matcher = BeNaNMatcher.new
matcher.matches?(0)
matcher.failure_message.should == ["Expected 0", "to be NaN"]
end
it "provides a useful negative failure message" do
matcher = BeNaNMatcher.new
matcher.matches?(nan_value)
matcher.negative_failure_message.should == ["Expected NaN", "not to be NaN"]
end
end
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