feat(content): more test cases

backend/data/questions/merge-intervals.yaml

@@ -9,6 +9,24 @@ categories:
 patterns:
   - intervals
 
+function_signature: "def merge(intervals: list[list[int]]) -> list[list[int]]:"
+
+test_cases:
+  visible:
+    - input: { intervals: [[1, 3], [2, 6], [8, 10], [15, 18]] }
+      expected: [[1, 6], [8, 10], [15, 18]]
+    - input: { intervals: [[1, 4], [4, 5]] }
+      expected: [[1, 5]]
+    - input: { intervals: [[1, 4], [0, 4]] }
+      expected: [[0, 4]]
+  hidden:
+    - input: { intervals: [[1, 4]] }
+      expected: [[1, 4]]
+    - input: { intervals: [[1, 4], [0, 0]] }
+      expected: [[0, 0], [1, 4]]
+    - input: { intervals: [[1, 4], [2, 3]] }
+      expected: [[1, 4]]
+
 description: |
   Given an array of `intervals` where `intervals[i] = [start_i, end_i]`, merge all overlapping intervals, and return *an array of the non-overlapping intervals that cover all the intervals in the input*.