feat(content): more test cases

backend/data/questions/longest-substring-without-repeating.yaml

@@ -9,6 +9,26 @@ categories:
 patterns:
   - sliding-window
 
+function_signature: "def length_of_longest_substring(s: str) -> int:"
+
+test_cases:
+  visible:
+    - input: { s: "abcabcbb" }
+      expected: 3
+    - input: { s: "bbbbb" }
+      expected: 1
+    - input: { s: "pwwkew" }
+      expected: 3
+  hidden:
+    - input: { s: "" }
+      expected: 0
+    - input: { s: " " }
+      expected: 1
+    - input: { s: "au" }
+      expected: 2
+    - input: { s: "dvdf" }
+      expected: 3
+
 description: |
   Given a string `s`, find the length of the **longest substring** without repeating characters.