commit - caf5a2e4344d368c834c8d00be84873248d843bc
commit + bda18df0aafe22fad505453b2dcdbe9868c90a54
blob - f5b1b8e532a444f4930b6d44be6d74995cd94971
blob + af4b5dbd2ab934d82ac95ac79ff2cb7de160e0bf
--- src/err.rs
+++ src/err.rs
@@ -8,12 +8,12 @@ use thiserror::Error;
 
 /// The general error used in the library.
 #[non_exhaustive]
-#[derive(Debug, Error)]
+#[derive(Debug, Error, PartialEq, Eq)]
 pub enum TodoError {
     /// The input has an incorrect format.
     #[error("Incorrect format: {0}")]
     IncorrectFormat(&'static str),
-    /// An error occured while parsing the input.
+    /// An error occurred while parsing the input.
     #[error("Error while parsing: {0}")]
     ParsingError(&'static str),
 }
blob - cc3b2ef7ab549d76a82bc2cf486bd9189329539a
blob + 15183b4929d763f4b870c60c739fe9925d1b155c
--- src/types.rs
+++ src/types.rs
@@ -318,3 +318,43 @@ impl<'a>
         })
     }
 }
+
+impl<'a> TryFrom<&'a str> for Task<'a> {
+    type Error = TodoError;
+
+    fn try_from(value: &'a str) -> Result<Self, Self::Error> {
+        Ok(parser::task(value)
+            .finish()
+            .map_err(|_| TodoError::ParsingError("Unable to parse task"))?
+            .1)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_tag_new_key_value() {
+        assert_eq!(
+            Tag::new_key_value("due", "2023-01-06"),
+            Ok(Tag::Due(NaiveDate::from_ymd_opt(2023, 1, 6).unwrap())),
+        );
+        assert!(matches!(
+            Tag::new_key_value("due", "invalid format"),
+            Err(TodoError::IncorrectFormat(_))
+        ));
+
+        assert_eq!(
+            Tag::new_key_value("rec", "+420y"),
+            Ok(Tag::Rec(Recurring::new(
+                true,
+                TimeAmount::new(420, TimeUnit::Year)
+            ))),
+        );
+        assert!(matches!(
+            Tag::new_key_value("rec", "0d"),
+            Err(TodoError::IncorrectFormat(_))
+        ));
+    }
+}