Create parameterless initializer for TypeMatcher

src/spectator/dsl/matcher_dsl.cr

@@ -41,7 +41,7 @@ module Spectator::DSL
     # expect(x).to be_a(Int32 | String)
     # ```
     macro be_a(expected)
-      ::Spectator::Matchers::TypeMatcher({{expected}}).new({{expected.stringify}}, nil)
+      ::Spectator::Matchers::TypeMatcher({{expected}}).new
     end
   end
 end

src/spectator/matchers/type_matcher.cr

@@ -4,6 +4,12 @@ module Spectator::Matchers
   # Matcher that tests a value is of a specified type.
   # The values are compared with the `#is_a?` method.
   struct TypeMatcher(Expected) < ValueMatcher(Nil)
+    # Creates the type matcher.
+    # The `Expected` type param will be used to populate the underlying label.
+    def initialize
+      super(Expected.to_s, nil)
+    end
+
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
     def match?(partial : Expectations::ValueExpectationPartial(ActualType)) : Bool forall ActualType