Root example group specialization

src/spectator/dsl/builder.cr

@@ -2,11 +2,9 @@ module Spectator::DSL
   module Builder
     extend self
 
-    @@group_stack = [::Spectator::DSL::ExampleGroupBuilder.new("ROOT")]
+    @@group_stack = Array(ExampleGroupBuilder).new(1, root_group)
 
-    private def root_group
-      @@group_stack.first
-    end
+    private class_getter root_group = RootExampleGroupBuilder.new()
 
     private def current_group
       @@group_stack.last
@@ -57,7 +55,7 @@ module Spectator::DSL
     end
 
     protected def build : ExampleGroup
-      root_group.build(nil, Internals::SampleValues.empty)
+      root_group.build(Internals::SampleValues.empty)
     end
   end
 end

src/spectator/dsl/root_example_group_builder.cr

@@ -0,0 +1,15 @@
+module Spectator::DSL
+  class RootExampleGroupBuilder < ExampleGroupBuilder
+    def initialize
+      super("ROOT")
+    end
+    
+    def build(sample_values : Internals::SampleValues) : ExampleGroup
+      RootExampleGroup.new(build_hooks).tap do |group|
+        group.children = @children.map do |child|
+          child.build(group, sample_values).as(ExampleGroup::Child)
+        end
+      end
+    end
+  end
+end

src/spectator/includes.cr

@@ -18,6 +18,7 @@ require "./pending_example"
 
 require "./example_hooks"
 require "./example_group"
+require "./root_example_group"
 
 require "./expectation_failed"
 require "./test_results"

src/spectator/root_example_group.cr

@@ -0,0 +1,13 @@
+require "./example_group"
+
+module Spectator
+  class RootExampleGroup < ExampleGroup
+    def initialize(hooks)
+      super("ROOT", nil, hooks)
+    end
+
+    def to_s(io)
+      # ...
+    end
+  end
+end