initial commit

exercises/03_ticket_v1/01_struct/src/lib.rs

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+// Define a struct named `Order` with the following fields:
+// - `price`, an unsigned integer
+// - `quantity`, an unsigned integer
+//
+// It should also have a method named `is_available` that returns a `true` if the quantity is
+// greater than 0, otherwise `false`.
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_order_is_available() {
+        let order = Order {
+            price: 100,
+            quantity: 10,
+        };
+        assert!(order.is_available());
+    }
+
+    #[test]
+    fn test_order_is_not_available() {
+        let order = Order {
+            price: 100,
+            quantity: 0,
+        };
+        assert!(!order.is_available());
+    }
+}