Add truthy matcher

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Michael Miller 2019-01-23 15:51:36 -07:00
parent 429c2d7302
commit 9befd5ee4f

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require "./value_matcher"
module Spectator::Matchers
# Matcher that tests whether a value is truthy or falsey.
# Falsey means a value is considered false by an if-statement,
# which are `false` and `nil` in Crystal.
# Truthy is the opposite of falsey.
struct TruthyMatcher < ValueMatcher(Bool)
# Creates the truthy matcher.
def initialize(truthy : Bool)
super(truthy ? "truthy" : "falsey", truthy)
end
# Determines whether the matcher is satisfied with the value given to it.
# True is returned if the match was successful, false otherwise.
def match?(partial : Expectations::ValueExpectationPartial(ActualType)) : Bool forall ActualType
# Cast value to truthy value and compare.
@expected == !!partial.value
end
# Describes the condition that satisfies the matcher.
# This is informational and displayed to the end-user.
def message(partial : Expectations::ValueExpectationPartial(ActualType)) : String forall ActualType
"Expected #{partial.label} to be #{label}"
end
# Describes the condition that won't satsify the matcher.
# This is informational and displayed to the end-user.
def negated_message(partial : Expectations::ValueExpectationPartial(ActualType)) : String forall ActualType
"Expected #{partial.label} to not be #{label}"
end
end
end