test: add broken test case for jsx-key rule

Author: yialo

tests/lib/rules/jsx-key.js

@@ -387,5 +387,27 @@ ruleTester.run('jsx-key', rule, {
         { messageId: 'missingIterKey' },
       ],
     },
+    {
+      code: `
+        const TestCase = () => {
+          const list = [1, 2, 3, 4, 5];
+
+          return (
+            <div>
+              {list.map(item => {
+                if (item < 2) return <div>{item}</div>;
+                else if (item < 5) return <div />;
+                else return <div />;
+              })}
+            </div>
+          );
+        };
+      `,
+      errors: [
+        { messageId: 'missingIterKey' },
+        { messageId: 'missingIterKey' },
+        { messageId: 'missingIterKey' },
+      ],
+    },
   ]),
 });