misc: add tests

Author: tinycedar

.gitignore

@@ -8,3 +8,4 @@ Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+/.idea/

tests/add.rs

@@ -0,0 +1,23 @@
+pub fn add(a: i32, b: i32) -> i32 {
+    a + b
+}
+
+#[allow(dead_code)]
+fn bad_add(a: i32, b: i32) -> i32 {
+    a - b
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_add() {
+        assert_eq!(add(1, 2), 3);
+    }
+
+    #[test]
+    fn test_bad_add() {
+        assert_eq!(bad_add(1, 2), -1);
+    }
+}

tests/trait.rs

@@ -0,0 +1,41 @@
+struct Duck;
+
+struct Pig;
+
+trait Fly {
+    fn fly(&self) -> bool;
+}
+
+impl Fly for Duck {
+    fn fly(&self) -> bool {
+        true
+    }
+}
+
+impl Fly for Pig {
+    fn fly(&self) -> bool {
+        false
+    }
+}
+
+fn fly_static<T: Fly>(s: T) -> bool {
+    s.fly()
+}
+
+fn fly_dyn(s: &dyn Fly) -> bool {
+    s.fly()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_trait() {
+        let pig = Pig;
+        assert_eq!(fly_static::<Pig>(pig), false);
+
+        let duck = Duck;
+        assert_eq!(fly_dyn(&duck), true);
+    }
+}