feat(content): function signatures + test cases

backend/data/questions/binary-number-with-alternating-bits.yaml

@@ -8,6 +8,32 @@ categories:
 patterns:
   - greedy
 
+function_signature: "def has_alternating_bits(n: int) -> bool:"
+
+test_cases:
+  visible:
+    - input: { n: 5 }
+      expected: true
+    - input: { n: 7 }
+      expected: false
+    - input: { n: 11 }
+      expected: false
+  hidden:
+    - input: { n: 1 }
+      expected: true
+    - input: { n: 2 }
+      expected: true
+    - input: { n: 10 }
+      expected: true
+    - input: { n: 21 }
+      expected: true
+    - input: { n: 15 }
+      expected: false
+    - input: { n: 1431655765 }
+      expected: true
+    - input: { n: 4 }
+      expected: false
+
 description: |
   Given a positive integer `n`, check whether it has **alternating bits**: namely, if two adjacent bits will always have different values.