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`class Key`

Represents a predicate that checks if a hash has a specific key.

Definitions

`def initialize(name, predicate = nil)`

Initialize a new Key predicate.

Signature

parameter　name　Object: The key name to check for.
parameter　predicate　Object, nil: Optional predicate to apply to the key's value.

Implementation

def initialize(name, predicate = nil)
	@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("key ")
	output.variable(@name)
	output.write(" ", @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 (should be a hash).

Implementation

def call(assertions, subject)
	# We want to group all the assertions in to a distinct group:
	assertions.nested(self, distinct: true) do |assertions|
		assertions.assert(subject.key?(@name), "has key")
		if @predicate
			Expect.new(assertions, subject[@name]).to(@predicate)
		end
	end
end