✨ feat(retention): implement retention policy configuration

- define struct for retention policy with message age and label generation
- add methods to create, access, and modify retention policies
- implement default values, cloning, equality, and debug formatting

src/retention.rs

@@ -19,7 +19,7 @@ pub use message_age::MessageAge;
 /// // Create a retention policy without auto-generated labels
 /// let policy = Retention::new(MessageAge::Years(1), false);
 /// ```
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct Retention {
     age: MessageAge,
     generate_label: bool,
@@ -70,6 +70,7 @@ impl Retention {
     /// let policy = Retention::new(MessageAge::Days(30), true);
     /// assert_eq!(policy.age(), &MessageAge::Days(30));
     /// ```
+    #[must_use]
     pub fn age(&self) -> &MessageAge {
         &self.age
     }
@@ -90,6 +91,7 @@ impl Retention {
     /// let policy = Retention::new(MessageAge::Days(30), false);
     /// assert_eq!(policy.generate_label(), false);
     /// ```
+    #[must_use]
     pub fn generate_label(&self) -> bool {
         self.generate_label
     }
@@ -120,7 +122,7 @@ mod tests {
         let retention = Retention::new(age.clone(), true);
 
         assert_eq!(retention.age(), &age);
-        assert_eq!(retention.generate_label(), true);
+        assert!(retention.generate_label());
     }
 
     #[test]
@@ -129,7 +131,7 @@ mod tests {
         let retention = Retention::new(age.clone(), false);
 
         assert_eq!(retention.age(), &age);
-        assert_eq!(retention.generate_label(), false);
+        assert!(!retention.generate_label());
     }
 
     #[test]
@@ -137,13 +139,13 @@ mod tests {
         let age = MessageAge::Months(6);
         let mut retention = Retention::new(age.clone(), false);
 
-        assert_eq!(retention.generate_label(), false);
+        assert!(!retention.generate_label());
 
         retention.set_generate_label(true);
-        assert_eq!(retention.generate_label(), true);
+        assert!(retention.generate_label());
 
         retention.set_generate_label(false);
-        assert_eq!(retention.generate_label(), false);
+        assert!(!retention.generate_label());
     }
 
     #[test]
@@ -178,7 +180,7 @@ mod tests {
         let default = Retention::default();
 
         assert_eq!(default.age(), &MessageAge::Years(5));
-        assert_eq!(default.generate_label(), true);
+        assert!(default.generate_label());
     }
 
     #[test]
@@ -193,10 +195,10 @@ mod tests {
         assert_eq!(retention_months.age().period_type(), "months");
         assert_eq!(retention_years.age().period_type(), "years");
 
-        assert_eq!(retention_days.generate_label(), true);
-        assert_eq!(retention_weeks.generate_label(), false);
-        assert_eq!(retention_months.generate_label(), true);
-        assert_eq!(retention_years.generate_label(), false);
+        assert!(retention_days.generate_label());
+        assert!(!retention_weeks.generate_label());
+        assert!(retention_months.generate_label());
+        assert!(!retention_years.generate_label());
     }
 
     #[test]