Update ValueMatcher to use Matcher's methods

src/spectator/matchers/value_matcher.cr

@@ -3,28 +3,22 @@ require "./matcher"
 module Spectator::Matchers
   # Category of matcher that uses a value.
   # Matchers of this type expect that a SUT applies to the value in some way.
-  # Sub-types must implement `Matcher#match?`, `Matcher#message`, and `Matcher#negated_message`.
   abstract struct ValueMatcher(ExpectedType) < Matcher
-    # Textual representation of what the matcher expects.
-    # This shouldn't be used in the conditional logic,
-    # but for verbose output to help the end-user.
-    getter label
-
     # Expected value.
     # Sub-types may use this value to test the expectation and generate message strings.
-    getter expected
+    getter expected : TestValue(ExpectedType)
 
     # Creates the value matcher.
-    # The label should be a string representation of the expectation.
     # The expected value is stored for later use.
-    def initialize(@expected : ExpectedType, @label : String)
+    def initialize(@expected)
     end
 
-    # Creates the value matcher.
-    # The label is generated by calling `#to_s` on the expected value.
-    # The expected value is stored for later use.
-    def initialize(expected : ExpectedType)
-      initialize(expected, expected.to_s)
+    private def values(actual) : Array(LabeledValue)
+      super(actual) << LabeledValue.new(expected.value.to_s, "expected")
+    end
+
+    private def negated_values(actual) : Array(LabeledValue)
+      super(actual) << LabeledValue.new("Not #{expected.value}", "expected")
     end
   end
 end