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# frozen_string_literal: true
module Matchi
class Change
# *Change by* matcher.
class By
# @return [#object_id] An expected delta.
attr_reader :expected
# Initialize the matcher with an object and a block.
#
# @example
# require "matchi/change/by"
#
# object = []
#
# Matchi::Change::By.new(1) { object.length }
#
# @param expected [#object_id] An expected delta.
# @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/by"
#
# object = []
#
# matcher = Matchi::Change::By.new(1) { object.length }
#
# matcher.expected # => 1
# matcher.matches? { object << "foo" } # => true
#
# @yieldreturn [#object_id] The block of code to execute.
#
# @return [Boolean] Comparison between the value before and after the
# code execution.
def matches?
value_before = @state.call
yield
value_after = @state.call
expected == (value_after - value_before)
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 by #{expected.inspect}"
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems