feat(content): hidden test cases

backend/data/questions/check-if-object-instance-of-class.yaml

@@ -8,6 +8,30 @@ categories:
 patterns:
   - dfs
 
+function_signature: "function checkIfInstanceOf(obj, classFunction)"
+
+test_cases:
+  visible:
+    - input: { obj: "new Date()", classFunction: "Date" }
+      expected: true
+    - input: { obj: "5", classFunction: "Number" }
+      expected: true
+    - input: { obj: "Date", classFunction: "Date" }
+      expected: false
+  hidden:
+    - input: { obj: "null", classFunction: "Object" }
+      expected: false
+    - input: { obj: "undefined", classFunction: "Object" }
+      expected: false
+    - input: { obj: "'hello'", classFunction: "String" }
+      expected: true
+    - input: { obj: "[]", classFunction: "Array" }
+      expected: true
+    - input: { obj: "[]", classFunction: "Object" }
+      expected: true
+    - input: { obj: "{}", classFunction: "Object" }
+      expected: true
+
 description: |
   Write a function that checks if a given value is an instance of a given class or superclass. For this problem, an object is considered an instance of a given class if that object has access to that class's methods.