[Add] exercises\tests

exercises/quiz3.rs

@@ -14,10 +14,27 @@
 
 // Execute `rustlings hint quiz3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
+use std::fmt::{Display, Formatter, Result as FmtResult};
+
+pub enum Grade {
+    Numeric(f32),
+    Alphabetical(String),
+}
+
+impl Display for Grade {
+    fn fmt(&self, fmt: &mut Formatter<'_>) -> FmtResult {
+        let grade = match &self {
+            Grade::Numeric(grade) => grade.to_string(),
+            Grade::Alphabetical(grade) => grade.to_string(),
+        };
+
+        write!(fmt, "{}", grade);
+        Ok(())
+    }
+}
 
 pub struct ReportCard {
-    pub grade: f32,
+    pub grade: Grade,
     pub student_name: String,
     pub student_age: u8,
 }
@@ -36,7 +53,7 @@ mod tests {
     #[test]
     fn generate_numeric_report_card() {
         let report_card = ReportCard {
-            grade: 2.1,
+            grade: Grade::Numeric(2.1),
             student_name: "Tom Wriggle".to_string(),
             student_age: 12,
         };
@@ -48,9 +65,8 @@ mod tests {
 
     #[test]
     fn generate_alphabetic_report_card() {
-        // TODO: Make sure to change the grade here after you finish the exercise.
         let report_card = ReportCard {
-            grade: 2.1,
+            grade: Grade::Alphabetical("A+".into()),
             student_name: "Gary Plotter".to_string(),
             student_age: 11,
         };

exercises/tests/tests1.rs

@@ -7,12 +7,10 @@
 // pass! Make the test fail!
 // Execute `rustlings hint tests1` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 #[cfg(test)]
 mod tests {
     #[test]
     fn you_can_assert() {
-        assert!();
+        assert!(true, true);
     }
 }

exercises/tests/tests2.rs

@@ -3,12 +3,10 @@
 // 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!();
+        assert_eq!(true, true);
     }
 }

exercises/tests/tests3.rs

@@ -4,8 +4,6 @@
 // we expect to get when we call `is_even(5)`.
 // Execute `rustlings hint tests3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
-
 pub fn is_even(num: i32) -> bool {
     num % 2 == 0
 }
@@ -16,11 +14,11 @@ mod tests {
 
     #[test]
     fn is_true_when_even() {
-        assert!();
+        assert!(is_even(4));
     }
 
     #[test]
     fn is_false_when_odd() {
-        assert!();
+        assert!(is_even(5) == false);
     }
 }