1 files changed, 88 insertions, 0 deletions
diff --git a/exercises/07_structs/structs3.rs b/exercises/07_structs/structs3.rs
new file mode 100644
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+++ b/exercises/07_structs/structs3.rs
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+// structs3.rs
+//
+// Structs contain data, but can also have logic. In this exercise we have
+// defined the Package struct and we want to test some logic attached to it.
+// Make the code compile and the tests pass!
+//
+// Execute `rustlings hint structs3` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+#[derive(Debug)]
+struct Package {
+    sender_country: String,
+    recipient_country: String,
+    weight_in_grams: u32,
+}
+
+impl Package {
+    fn new(sender_country: String, recipient_country: String, weight_in_grams: u32) -> Package {
+        if weight_in_grams < 10 {
+            // This is not how you should handle errors in Rust,
+            // but we will learn about error handling later.
+            panic!("Can not ship a package with weight below 10 grams.")
+        } else {
+            Package {
+                sender_country,
+                recipient_country,
+                weight_in_grams,
+            }
+        }
+    }
+
+    fn is_international(&self) -> ??? {
+        // Something goes here...
+    }
+
+    fn get_fees(&self, cents_per_gram: u32) -> ??? {
+        // Something goes here...
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    #[should_panic]
+    fn fail_creating_weightless_package() {
+        let sender_country = String::from("Spain");
+        let recipient_country = String::from("Austria");
+
+        Package::new(sender_country, recipient_country, 5);
+    }
+
+    #[test]
+    fn create_international_package() {
+        let sender_country = String::from("Spain");
+        let recipient_country = String::from("Russia");
+
+        let package = Package::new(sender_country, recipient_country, 1200);
+
+        assert!(package.is_international());
+    }
+
+    #[test]
+    fn create_local_package() {
+        let sender_country = String::from("Canada");
+        let recipient_country = sender_country.clone();
+
+        let package = Package::new(sender_country, recipient_country, 1200);
+
+        assert!(!package.is_international());
+    }
+
+    #[test]
+    fn calculate_transport_fees() {
+        let sender_country = String::from("Spain");
+        let recipient_country = String::from("Spain");
+
+        let cents_per_gram = 3;
+
+        let package = Package::new(sender_country, recipient_country, 1500);
+
+        assert_eq!(package.get_fees(cents_per_gram), 4500);
+        assert_eq!(package.get_fees(cents_per_gram * 2), 9000);
+    }
+}