Actualizar 13.integers.md

Author: Phosphorus-M

content/13.integers.md

@@ -15,11 +15,11 @@ initialCode: |
         println!("Multiplicación: {multiplicacion}");
     }
 tests:
-    - code should be contain `i8`
-    - code should be contain `u16`
-    - code should be contain `i32`
-    - code should be contain `Suma: `
-    - code should be contain `Multiplicación: `
+    - "code should be contain `i8`"
+    - "code should be contain `u16`"
+    - "code should be contain `i32`"
+    - "code should be contain `Suma: `"
+    - "code should be contain `Multiplicación: `"
 order: 13
 ---