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