feat(content): function signatures + test cases

backend/data/questions/chalkboard-xor-game.yaml

@@ -9,6 +9,30 @@ categories:
 patterns:
   - greedy
 
+function_signature: "def xor_game(nums: list[int]) -> bool:"
+
+test_cases:
+  visible:
+    - input: { nums: [1, 1, 2] }
+      expected: false
+    - input: { nums: [0, 1] }
+      expected: true
+    - input: { nums: [1, 2, 3] }
+      expected: true
+  hidden:
+    - input: { nums: [1] }
+      expected: false
+    - input: { nums: [0, 0] }
+      expected: true
+    - input: { nums: [1, 1] }
+      expected: true
+    - input: { nums: [1, 2, 3, 4] }
+      expected: true
+    - input: { nums: [5, 5, 5] }
+      expected: false
+    - input: { nums: [1, 2, 4, 8] }
+      expected: true
+
 description: |
   You are given an array of integers `nums` representing the numbers written on a chalkboard.