feat: add min method to Outcome

01.workspace/oxidice_lib/src/imp/outcome_min.rs

@@ -0,0 +1,40 @@
+use crate::*;
+
+fn min_of(values: Vec<u16>) -> Result<Outcome, FailedTo> {
+    if values.is_empty() {
+        return Err(FailedTo::ProcessInput);
+    }
+    Ok(Outcome::Scalar(u16::MIN)).and_then(|_| {
+        values
+            .iter()
+            .min()
+            .ok_or(FailedTo::FindMin)
+            .map(|min| Outcome::Scalar(*min))
+    })
+}
+
+impl Outcome {
+    pub fn min(self) -> Result<Outcome, FailedTo> {
+        match self {
+            Outcome::Scalar(value) => Ok(Outcome::Scalar(value)),
+            Outcome::List(values) => min_of(values),
+        }
+    }
+}
+
+#[cfg(test)]
+mod unit_tests {
+    use super::*;
+    #[test]
+    fn check_min() {
+        let roll_result = Handful::grab(2, 20).roll();
+        let min_result = roll_result.clone().min().unwrap();
+        match roll_result {
+            Outcome::List(values) => {
+                let min = values.iter().min().unwrap();
+                assert_eq!(min_result, Outcome::Scalar(*min));
+            }
+            _ => panic!("result is not a list"),
+        }
+    }
+}