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