feat(content): function signatures + test cases

backend/data/questions/verifying-an-alien-dictionary.yaml

@@ -10,6 +10,26 @@ categories:
 patterns:
   - two-pointers
 
+function_signature: "def is_alien_sorted(words: list[str], order: str) -> bool:"
+
+test_cases:
+  visible:
+    - input: { words: ["hello", "leetcode"], order: "hlabcdefgijkmnopqrstuvwxyz" }
+      expected: true
+    - input: { words: ["word", "world", "row"], order: "worldabcefghijkmnpqstuvxyz" }
+      expected: false
+    - input: { words: ["apple", "app"], order: "abcdefghijklmnopqrstuvwxyz" }
+      expected: false
+  hidden:
+    - input: { words: ["a"], order: "abcdefghijklmnopqrstuvwxyz" }
+      expected: true
+    - input: { words: ["a", "b", "c"], order: "abcdefghijklmnopqrstuvwxyz" }
+      expected: true
+    - input: { words: ["app", "apple"], order: "abcdefghijklmnopqrstuvwxyz" }
+      expected: true
+    - input: { words: ["a", "a"], order: "abcdefghijklmnopqrstuvwxyz" }
+      expected: true
+
 description: |
   In an alien language, surprisingly, they also use English lowercase letters, but possibly in a different `order`. The `order` of the alphabet is some permutation of lowercase letters.