Secondary initializer for missing label

Label is set to actual/expected stringified value if omitted.

src/spectator/expectations/value_expectation_partial.cr

@@ -8,14 +8,17 @@ module Spectator::Expectations
     getter actual
 
     # Creates the expectation partial.
+    # The label should be a string representation of the actual value.
+    # The actual value is stored for later use.
     protected def initialize(label : String, @actual : ActualType)
       super(label)
     end
 
-    # Returns the actual value as a string
-    # if there's no label available.
-    def label
-      super.empty? ? actual.to_s : super
+    # Creates the expectation partial.
+    # The label is generated by calling `#to_s` on the actual value.
+    # The actual value is stored for later use.
+    protected def initialize(@actual : ActualType)
+      super(@actual.to_s)
     end
 
     # Asserts that the `#actual` value matches some criteria.

src/spectator/matchers/value_matcher.cr

@@ -17,6 +17,13 @@ module Spectator::Matchers
       super(label)
     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)
+      super(@expected.to_s)
+    end
+
     # Determines whether the matcher is satisfied with the value given to it.
     # True is returned if the match was successful, false otherwise.
     abstract def match?(partial : ValueExpectationPartial(ActualType)) : Bool forall ActualType

src/spectator/should.cr

@@ -20,7 +20,7 @@ class Object
     # First argument of the `Expectation` initializer is the expression label.
     # However, since this isn't a macro and we can't "look behind" this method call
     # to see what it was invoked on, the argument is an empty string.
-    expectation = ::Spectator::Expectation.new("", self)
+    expectation = ::Spectator::Expectation.new(self)
     unless matcher.match?(expectation)
       raise ::Spectator::ExpectationFailed.new(matcher.message(expectation))
     end
@@ -29,7 +29,7 @@ class Object
   # Works the same as `#should` except the condition is inverted.
   # When `#should` succeeds, this method will fail, and vice-versa.
   def should_not(matcher : ::Spectator::Matchers::Matcher)
-    expectation = ::Spectator::Expectation.new("", self)
+    expectation = ::Spectator::Expectation.new(self)
     if matcher.match?(expectation)
       raise ::Spectator::ExpectationFailed.new(matcher.message(expectation))
     end