lib/matchi/change/by.rb in matchi-3.0.0 vs lib/matchi/change/by.rb in matchi-3.1.0

@@ -2,10 +2,13 @@
 
 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"
       #
@@ -28,31 +31,33 @@
       #   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?(*, **)
+      def matches?
         value_before = @state.call
         yield
         value_after = @state.call
 
-        @expected == (value_after - value_before)
+        expected == (value_after - value_before)
       end
 
       # A string containing a human-readable representation of the matcher.
       def inspect
-        "#{self.class}(#{@expected.inspect})"
+        "#{self.class}(#{expected.inspect})"
       end
 
       # Returns a string representing the matcher.
       def to_s
-        "change by #{@expected.inspect}"
+        "change by #{expected.inspect}"
       end
     end
   end
 end