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`class Attribute`

Represents a predicate that checks if an object has a specific attribute.

Definitions

`def initialize(name, predicate)`

Initialize a new Attribute predicate.

Signature

parameter　name　Symbol, String: The attribute name to check for.
parameter　predicate　Object: The predicate to apply to the attribute's value.

Implementation

def initialize(name, predicate)
	@name = name
	@predicate = predicate
end

`def print(output)`

Print a representation of this predicate.

Signature

parameter　output　Output: The output target.

Implementation

def print(output)
	output.write("attribute ", :variable, @name.to_s, :reset, " ", @predicate, :reset)
end

`def call(assertions, subject)`

Evaluate this predicate against a subject.

Signature

parameter　assertions　Assertions: The assertions instance to use.
parameter　subject　Object: The subject to evaluate.

Implementation

def call(assertions, subject)
	assertions.nested(self, distinct: true) do |assertions|
		assertions.assert(subject.respond_to?(@name), "has attribute")
		if @predicate
			Expect.new(assertions, subject.public_send(@name)).to(@predicate)
		end
	end
end