feat(content): function signatures + test cases

backend/data/questions/design-add-and-search-words-data-structure.yaml

@@ -10,6 +10,40 @@ patterns:
   - trie
   - dfs
 
+function_signature: "class WordDictionary: ..."
+
+test_cases:
+  visible:
+    - input:
+        operations: ["WordDictionary", "addWord", "addWord", "addWord", "search", "search", "search", "search"]
+        arguments: [[], ["bad"], ["dad"], ["mad"], ["pad"], ["bad"], [".ad"], ["b.."]]
+      expected: [null, null, null, null, false, true, true, true]
+  hidden:
+    - input:
+        operations: ["WordDictionary", "addWord", "search", "search"]
+        arguments: [[], ["a"], ["a"], ["."]]
+      expected: [null, null, true, true]
+    - input:
+        operations: ["WordDictionary", "addWord", "addWord", "search", "search", "search"]
+        arguments: [[], ["apple"], ["app"], ["app"], ["apple"], ["appl"]]
+      expected: [null, null, null, true, true, false]
+    - input:
+        operations: ["WordDictionary", "search"]
+        arguments: [[], ["a"]]
+      expected: [null, false]
+    - input:
+        operations: ["WordDictionary", "addWord", "addWord", "search", "search"]
+        arguments: [[], ["at"], ["and"], ["a"], [".at"]]
+      expected: [null, null, null, false, false]
+    - input:
+        operations: ["WordDictionary", "addWord", "addWord", "addWord", "search", "search", "search"]
+        arguments: [[], ["abc"], ["adc"], ["aec"], ["a.c"], ["..c"], ["..."]]
+      expected: [null, null, null, null, true, true, true]
+    - input:
+        operations: ["WordDictionary", "addWord", "search", "search", "search"]
+        arguments: [[], ["ab"], ["a."], [".b"], [".."]]
+      expected: [null, null, true, true, true]
+
 description: |
   Design a data structure that supports adding new words and finding if a string matches any previously added string.