Update tests2.rs

Author: 13001288072

exercises/tests/tests2.rs

@@ -1,17 +1,11 @@
-// tests2.rs
-//
-// This test has a problem with it -- make the test compile! Make the test pass!
-// Make the test fail!
-//
-// Execute `rustlings hint tests2` or use the `hint` watch subcommand for a
-// hint.
-
-// I AM NOT DONE
-
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert_eq() {
-        assert_eq!();
+        // 1. 让测试编译并通过：assert_eq! 需要两个相等的参数
+        // assert_eq!(42, 42); 
+
+        // 2. 让测试编译但失败：传入两个不相等的参数（取消注释下面这行，注释上面的）
+        assert_eq!(42, 13);
     }
 }