Move DSL-based code to subclass of SpectatorContext

This resolves a circular dependency.

src/spectator.cr

@@ -1,5 +1,5 @@
 require "./spectator/includes"
-require "./spectator_context"
+require "./spectator_test_context"
 
 # Module that contains all functionality related to Spectator.
 module Spectator
@@ -38,7 +38,7 @@ module Spectator
     # For more information on how the DSL works, see the `DSL` module.
 
     # Root-level class that contains all examples and example groups.
-    class SpectatorContext
+    class ::SpectatorTestContext
       # Pass off the description argument and block to `DSL::StructureDSL.describe`.
       # That method will handle creating a new group for this spec.
       describe({{description}}) {{block}}

src/spectator_context.cr

@@ -4,17 +4,4 @@
 # This type is intentionally outside the `Spectator` module.
 # The reason for this is to prevent name collision when using the DSL to define a spec.
 abstract class SpectatorContext
-  # Initial implicit subject for tests.
-  # This method should be overridden by example groups when an object is described.
-  private def _spectator_implicit_subject
-    nil
-  end
-
-  # Initial subject for tests.
-  # Returns the implicit subject.
-  # This method should be overridden when an explicit subject is defined by the DSL.
-  # TODO: Subject needs to be cached.
-  private def subject
-    _spectator_implicit_subject
-  end
 end

src/spectator_test_context.cr

@@ -0,0 +1,23 @@
+require "./spectator_context"
+require "./spectator/dsl"
+
+class SpectatorTestContext < SpectatorContext
+  include ::Spectator::DSL::Groups
+
+  # Initial implicit subject for tests.
+  # This method should be overridden by example groups when an object is described.
+  private def _spectator_implicit_subject
+    nil
+  end
+
+  # Initial subject for tests.
+  # Returns the implicit subject.
+  # This method should be overridden when an explicit subject is defined by the DSL.
+  # TODO: Subject needs to be cached.
+  private def subject
+    _spectator_implicit_subject
+  end
+
+  # def initialize(@spectator_test_values : ::Spectator::TestValues)
+  # end
+end