feat(content): more test cases

backend/data/questions/generate-parentheses.yaml

@@ -9,6 +9,20 @@ categories:
 patterns:
   - backtracking
 
+function_signature: "def generate_parenthesis(n: int) -> list[str]:"
+
+test_cases:
+  visible:
+    - input: { n: 3 }
+      expected: ["((()))", "(()())", "(())()", "()(())", "()()()"]
+    - input: { n: 1 }
+      expected: ["()"]
+  hidden:
+    - input: { n: 2 }
+      expected: ["(())", "()()"]
+    - input: { n: 4 }
+      expected: ["(((())))", "((()()))", "((())())", "((()))()", "(()(()))", "(()()())", "(()())()", "(())(())", "(())()()", "()((()))", "()(()())", "()(())()", "()()(())", "()()()()"]
+
 description: |
   Given `n` pairs of parentheses, write a function to *generate all combinations of well-formed parentheses*.