completed test part

exercises/16_lifetimes/lifetimes3.rs

@@ -8,7 +8,7 @@ struct Book<'a> {
 
 // Will the strings pointed to by book still be valid?
 fn main() {
-    let book = Book {
+    // let book = Book {
         author: "George Orwell",
         title: "1984",
     };

exercises/17_tests/tests1.rs

@@ -13,11 +13,12 @@ fn main() {
 mod tests {
     // TODO: Import `is_even`. You can use a wildcard to import everything in
     // the outer module.
+    use super::*;
 
     #[test]
     fn you_can_assert() {
         // TODO: Test the function `is_even` with some values.
-        assert!();
-        assert!();
+        assert!(is_even(32));
+        assert!(is_even(12));
     }
 }

exercises/17_tests/tests2.rs

@@ -15,9 +15,9 @@ mod tests {
     #[test]
     fn you_can_assert_eq() {
         // TODO: Test the function `power_of_2` with some values.
-        assert_eq!();
-        assert_eq!();
-        assert_eq!();
-        assert_eq!();
+        assert_eq!(power_of_2(3), 8);
+        assert_eq!(power_of_2(4), 16);
+        assert_eq!(power_of_2(3), 8);
+        assert_eq!(power_of_2(2), 4);
     }
 }

exercises/17_tests/tests3.rs

@@ -29,13 +29,14 @@ mod tests {
         // TODO: This test should check if the rectangle has the size that we
         // pass to its constructor.
         let rect = Rectangle::new(10, 20);
-        assert_eq!(todo!(), 10); // Check width
-        assert_eq!(todo!(), 20); // Check height
+        assert_eq!(rect.width, 10); // Check width
+        assert_eq!(rect.height, 20); // Check height
     }
 
     // TODO: This test should check if the program panics when we try to create
     // a rectangle with negative width.
     #[test]
+    #[should_panic]
     fn negative_width() {
         let _rect = Rectangle::new(-10, 10);
     }
@@ -43,6 +44,7 @@ mod tests {
     // TODO: This test should check if the program panics when we try to create
     // a rectangle with negative height.
     #[test]
+    #[should_panic]
     fn negative_height() {
         let _rect = Rectangle::new(10, -10);
     }