feat(content): more test cases

backend/data/questions/number-of-islands.yaml

@@ -11,6 +11,24 @@ patterns:
   - bfs
   - matrix-traversal
 
+function_signature: "def num_islands(grid: list[list[str]]) -> int:"
+
+test_cases:
+  visible:
+    - input: { grid: [["1", "1", "1", "1", "0"], ["1", "1", "0", "1", "0"], ["1", "1", "0", "0", "0"], ["0", "0", "0", "0", "0"]] }
+      expected: 1
+    - input: { grid: [["1", "1", "0", "0", "0"], ["1", "1", "0", "0", "0"], ["0", "0", "1", "0", "0"], ["0", "0", "0", "1", "1"]] }
+      expected: 3
+  hidden:
+    - input: { grid: [["1"]] }
+      expected: 1
+    - input: { grid: [["0"]] }
+      expected: 0
+    - input: { grid: [["1", "0", "1", "0", "1"]] }
+      expected: 3
+    - input: { grid: [["1", "1"], ["1", "1"]] }
+      expected: 1
+
 description: |
   Given an `m × n` 2D binary grid `grid` which represents a map of `'1'`s (land) and `'0'`s (water), return *the number of islands*.