test: traits_in_action_test

src/bin/tests/mod.rs

@@ -3,4 +3,5 @@ mod async_get_request_test;
 mod blocking_get_request_test;
 mod environment_variable_test;
 mod read_json_test;
+mod traits_in_action_test;
 mod write_json_tests;

src/bin/tests/traits_in_action_test.rs

@@ -0,0 +1,55 @@
+#[cfg(test)]
+mod traits_in_action_test {
+    use super::{book::Book, impl_me::Loggable};
+    #[test]
+    fn it_constructs_book_properly() {
+        let book = Book::new("Family Problems: The Randi Rona", "Raman Raghav");
+        assert_eq!(book.title, "Family Problems: The Randi Rona");
+        assert_eq!(book.author, "Raman Raghav");
+    }
+    #[test]
+    fn it_gets_description_properly() {
+        let book = Book::new("Family Problems: The Randi Rona", "Raman Raghav");
+        let description = book.get_description();
+        assert_eq!(
+            description,
+            "Family Problems: The Randi Rona by Raman Raghav"
+        );
+    }
+}
+
+pub mod book {
+    pub struct Book {
+        pub title: String,
+        pub author: String,
+    }
+}
+
+pub mod book_impl {
+    use super::book::Book;
+    impl Book {
+        pub fn new(title: &str, author: &str) -> Self {
+            Self {
+                title: title.to_string(),
+                author: author.to_string(),
+            }
+        }
+    }
+}
+
+pub mod book_loggable_impl {
+    use super::book::Book;
+    use super::impl_me::Loggable;
+
+    impl Loggable for Book {
+        fn get_description(&self) -> String {
+            format!("{} by {}", self.title, self.author)
+        }
+    }
+}
+
+pub mod impl_me {
+    pub trait Loggable {
+        fn get_description(&self) -> String;
+    }
+}