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# frozen_string_literal: true
module Matchi
class Change
# *Change to* matcher.
class To
# @return [#object_id] An expected new value.
attr_reader :expected
# Initialize the matcher with an object and a block.
#
# @example
# require "matchi/change/to"
#
# object = "foo"
#
# Matchi::Change::To.new("FOO") { object.to_s }
#
# @param expected [#object_id] An expected new value.
# @param state [Proc] A block of code to execute to get the
# state of the object.
def initialize(expected, &state)
@expected = expected
@state = state
end
# Boolean comparison on the expected change by comparing the value
# before and after the code execution.
#
# @example
# require "matchi/change/to"
#
# object = "foo"
#
# matcher = Matchi::Change::To.new("FOO") { object.to_s }
#
# matcher.expected # => "FOO"
# matcher.matches? { object.upcase! } # => true
#
# @yieldreturn [#object_id] The block of code to execute.
#
# @return [Boolean] Comparison between the value before and after the
# code execution.
def matches?
yield
value_after = @state.call
expected == value_after
end
# A string containing a human-readable representation of the matcher.
def inspect
"#{self.class}(#{expected.inspect})"
end
# Returns a string representing the matcher.
def to_s
"change to #{expected.inspect}"
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems