feat(content): function signatures + test cases

backend/data/questions/transpose-matrix.yaml

@@ -8,6 +8,24 @@ categories:
 patterns:
   - matrix-traversal
 
+function_signature: "def transpose(matrix: list[list[int]]) -> list[list[int]]:"
+
+test_cases:
+  visible:
+    - input: { matrix: [[1, 2, 3], [4, 5, 6], [7, 8, 9]] }
+      expected: [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
+    - input: { matrix: [[1, 2, 3], [4, 5, 6]] }
+      expected: [[1, 4], [2, 5], [3, 6]]
+  hidden:
+    - input: { matrix: [[1]] }
+      expected: [[1]]
+    - input: { matrix: [[1, 2], [3, 4]] }
+      expected: [[1, 3], [2, 4]]
+    - input: { matrix: [[1], [2], [3]] }
+      expected: [[1, 2, 3]]
+    - input: { matrix: [[1, 2, 3, 4]] }
+      expected: [[1], [2], [3], [4]]
+
 description: |
   Given a 2D integer array `matrix`, return *the **transpose** of* `matrix`.