Implement #described_class

README.md

@@ -88,7 +88,7 @@ In no particular order, features that have been implemented and are planned:
 
 - [ ] DSL
     - [X] `describe` and `context` blocks
-    - [ ] Contextual values with `let`, `let!`, `subject`, `described_class`
+    - [X] Contextual values with `let`, `let!`, `subject`, `described_class`
     - [ ] Test multiple and generated values - `given`
     - [ ] Before and after hooks - `before_each`, `before_all`, `after_each`, `after_all`, `around_each`
     - [ ] One-liner syntax

src/spectator/dsl.cr

@@ -17,6 +17,12 @@ module Spectator
 
         module Locals
           include {{parent_locals_module.id}}::Locals
+
+          {% if what.is_a?(Path) %}
+            def described_class
+              {{what}}
+            end
+          {% end %}
         end
 
         {{block.body}}