Get rid of #add_examples

Added #example_count method to help with array sizing.

src/spectator/example_group.cr

@@ -30,9 +30,21 @@ module Spectator
       @children.select { |child| child.is_a?(ExampleGroup) }.map { |child| child.unsafe_as(ExampleGroup) }
     end
 
+    def example_count
+      @children.sum do |child|
+        child.is_a?(ExampleFactory) ? 1 : child.example_count
+      end
+    end
+
     def all_examples
-      Array(Example).new.tap do |array|
-        add_examples(array)
+      Array(Example).new(example_count).tap do |array|
+        @children.each do |child|
+          if child.is_a?(ExampleFactory)
+            array << child.build
+          else
+            array.concat(child.all_examples)
+          end
+        end
       end
     end
 
@@ -94,15 +106,5 @@ module Spectator
     private def wrap_proc(inner : Proc(Nil) ->, wrapper : ->)
       -> { inner.call(wrapper) }
     end
-
-    def add_examples(array : Array(Example))
-      @children.each do |child|
-        if child.is_a?(ExampleFactory)
-          array << child.build
-        else
-          array.concat(child.all_examples)
-        end
-      end
-    end
   end
 end

src/spectator/given_example_group.cr

@@ -8,9 +8,13 @@ module Spectator
       super(what, parent)
     end
 
-    protected def add_examples(array : Array(Example))
-      @collection.each do |value|
-        examples = super.all_examples
+    def example_count
+      super.example_count * @collection.size
+    end
+
+    def all_examples
+      Array(Example).new(example_count).tap do |array|
+        examples = super
         examples.each do |example|
           @mapping[example] = value
         end