Implement ExampleComponent#example_count

src/spectator/example.cr

@@ -29,6 +29,11 @@ module Spectator
     def initialize(@group, sample_values : Internals::SampleValues)
     end
 
+    # Indicates there is only one example to run.
+    def example_count
+      1
+    end
+
     # String representation of the example.
     # This consists of the groups the example is in and the description.
     # The string can be given to end-users to identify the example.

src/spectator/example_component.cr

@@ -7,5 +7,8 @@ module Spectator
 
     # Indicates whether the example (or group) has been completely run.
     abstract def finished? : Bool
+
+    # The number of examples in this instance.
+    abstract def example_count : Int
   end
 end

src/spectator/example_group.cr

@@ -27,11 +27,8 @@ module Spectator
       children.each
     end
 
-    # TODO: Remove this method.
-    def example_count
-      children.sum do |child|
-        child.is_a?(Example) ? 1 : child.as(ExampleGroup).example_count
-      end
+    def example_count : Int
+      children.sum(&.example_count)
     end
 
     # TODO: Remove this method.