diff --git a/crate/cmd_model/src/cmd_outcome.rs b/crate/cmd_model/src/cmd_outcome.rs
index bde83916f..e23038edc 100644
--- a/crate/cmd_model/src/cmd_outcome.rs
+++ b/crate/cmd_model/src/cmd_outcome.rs
@@ -11,7 +11,7 @@ use crate::CmdBlockDesc;
 /// errored when processing an item.
 ///
 /// [`CmdExecution`]: https://docs.rs/peace_cmd_rt/latest/peace_cmd_rt/struct.CmdExecution.html
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum CmdOutcome<T, E> {
     /// Execution completed successfully.
     Complete {
diff --git a/crate/core/src/lib.rs b/crate/core/src/lib.rs
index 2d77229f5..333f07cfa 100644
--- a/crate/core/src/lib.rs
+++ b/crate/core/src/lib.rs
@@ -172,7 +172,7 @@ macro_rules! id_newtype {
         }
 
         #[doc = concat!("Error indicating `", stringify!($ty_name), "` provided is not in the correct format.")]
-        #[derive(Debug, PartialEq, Eq)]
+        #[derive(Clone, Debug, PartialEq, Eq)]
         pub struct $ty_err_name<'s> {
             /// String that was provided for the `$ty_name`.
             value: std::borrow::Cow<'s, str>,
diff --git a/workspace_tests/src/cmd_model.rs b/workspace_tests/src/cmd_model.rs
new file mode 100644
index 000000000..694cc9685
--- /dev/null
+++ b/workspace_tests/src/cmd_model.rs
@@ -0,0 +1 @@
+mod cmd_outcome;
diff --git a/workspace_tests/src/cmd_model/cmd_outcome.rs b/workspace_tests/src/cmd_model/cmd_outcome.rs
new file mode 100644
index 000000000..553f1d576
--- /dev/null
+++ b/workspace_tests/src/cmd_model/cmd_outcome.rs
@@ -0,0 +1,191 @@
+use peace::{
+    cmd_model::CmdOutcome,
+    rt_model::{fn_graph::StreamOutcome, IndexMap},
+};
+
+#[test]
+fn value() {
+    assert_eq!(Some(123), cmd_outcome_complete(123).value().copied());
+    assert_eq!(
+        Some(123),
+        cmd_outcome_block_interrupted(123).value().copied()
+    );
+    assert_eq!(
+        Some(123),
+        cmd_outcome_execution_interrupted(Some(123))
+            .value()
+            .copied()
+    );
+    assert_eq!(Some(123), cmd_outcome_item_error(123).value().copied());
+}
+
+#[test]
+fn is_complete() {
+    assert!(cmd_outcome_complete(123).is_complete());
+    assert!(!cmd_outcome_block_interrupted(123).is_complete());
+    assert!(!cmd_outcome_execution_interrupted(Some(123)).is_complete());
+    assert!(!cmd_outcome_item_error(123).is_complete());
+}
+
+#[test]
+fn is_interrupted() {
+    assert!(!cmd_outcome_complete(123).is_interrupted());
+    assert!(cmd_outcome_block_interrupted(123).is_interrupted());
+    assert!(cmd_outcome_execution_interrupted(Some(123)).is_interrupted());
+    assert!(!cmd_outcome_item_error(123).is_interrupted());
+}
+
+#[test]
+fn is_err() {
+    assert!(!cmd_outcome_complete(123).is_err());
+    assert!(!cmd_outcome_block_interrupted(123).is_err());
+    assert!(!cmd_outcome_execution_interrupted(Some(123)).is_err());
+    assert!(cmd_outcome_item_error(123).is_err());
+}
+
+#[test]
+fn map() {
+    assert_eq!(
+        cmd_outcome_complete(124),
+        cmd_outcome_complete(123).map(|value| value + 1)
+    );
+    assert_eq!(
+        cmd_outcome_block_interrupted(124),
+        cmd_outcome_block_interrupted(123).map(|value| value + 1)
+    );
+    assert_eq!(
+        cmd_outcome_execution_interrupted(Some(124)),
+        cmd_outcome_execution_interrupted(Some(123)).map(|value| value + 1)
+    );
+    assert_eq!(
+        cmd_outcome_execution_interrupted(None::<u32>),
+        cmd_outcome_execution_interrupted(None::<u32>).map(|value| value + 1)
+    );
+    assert_eq!(
+        cmd_outcome_item_error(124),
+        cmd_outcome_item_error(123).map(|value| value + 1)
+    );
+}
+
+#[tokio::test]
+async fn map_async() {
+    assert_eq!(
+        cmd_outcome_complete(124),
+        cmd_outcome_complete(123)
+            .map_async(|value| async move { value + 1 })
+            .await
+    );
+    assert_eq!(
+        cmd_outcome_block_interrupted(124),
+        cmd_outcome_block_interrupted(123)
+            .map_async(|value| async move { value + 1 })
+            .await
+    );
+    assert_eq!(
+        cmd_outcome_execution_interrupted(Some(124)),
+        cmd_outcome_execution_interrupted(Some(123))
+            .map_async(|value| async move { value + 1 })
+            .await
+    );
+    assert_eq!(
+        cmd_outcome_execution_interrupted(None::<u32>),
+        cmd_outcome_execution_interrupted(None::<u32>)
+            .map_async(|value| async move { value + 1 })
+            .await
+    );
+    assert_eq!(
+        cmd_outcome_item_error(124),
+        cmd_outcome_item_error(123)
+            .map_async(|value| async move { value + 1 })
+            .await
+    );
+}
+
+#[test]
+fn transpose() {
+    assert_eq!(
+        Ok(cmd_outcome_complete(123)),
+        cmd_outcome_complete(Ok(123)).transpose()
+    );
+    assert_eq!(
+        Err("err".to_string()),
+        cmd_outcome_complete(Err::<u32, _>("err".to_string())).transpose()
+    );
+    assert_eq!(
+        Ok(cmd_outcome_block_interrupted(123)),
+        cmd_outcome_block_interrupted(Ok(123)).transpose()
+    );
+    assert_eq!(
+        Err("err".to_string()),
+        cmd_outcome_block_interrupted(Err::<u32, _>("err".to_string())).transpose()
+    );
+    assert_eq!(
+        Ok(cmd_outcome_execution_interrupted(Some(123))),
+        cmd_outcome_execution_interrupted(Some(Ok(123))).transpose()
+    );
+    assert_eq!(
+        Err("err".to_string()),
+        cmd_outcome_execution_interrupted(Some(Err::<u32, _>("err".to_string()))).transpose()
+    );
+    assert_eq!(
+        Ok(cmd_outcome_execution_interrupted(None::<u32>)),
+        cmd_outcome_execution_interrupted(None::<Result<u32, String>>).transpose()
+    );
+    assert_eq!(
+        Ok(cmd_outcome_item_error(123)),
+        cmd_outcome_item_error(Ok(123)).transpose()
+    );
+    assert_eq!(
+        Err("err".to_string()),
+        cmd_outcome_item_error(Err::<u32, _>("err".to_string())).transpose()
+    );
+}
+
+#[test]
+fn clone() {
+    let cmd_outcome = cmd_outcome_complete(123);
+
+    assert_eq!(cmd_outcome, Clone::clone(&cmd_outcome));
+}
+
+#[test]
+fn debug() {
+    let cmd_outcome = cmd_outcome_complete(123);
+
+    assert_eq!(
+        "Complete { value: 123, cmd_blocks_processed: [] }",
+        format!("{cmd_outcome:?}")
+    );
+}
+
+fn cmd_outcome_complete<T>(value: T) -> CmdOutcome<T, String> {
+    CmdOutcome::<T, String>::Complete {
+        value,
+        cmd_blocks_processed: vec![],
+    }
+}
+
+fn cmd_outcome_block_interrupted<T>(value: T) -> CmdOutcome<T, String> {
+    CmdOutcome::<T, String>::BlockInterrupted {
+        stream_outcome: StreamOutcome::finished_with(value, Vec::new()),
+        cmd_blocks_processed: vec![],
+        cmd_blocks_not_processed: vec![],
+    }
+}
+
+fn cmd_outcome_execution_interrupted<T>(value: Option<T>) -> CmdOutcome<T, String> {
+    CmdOutcome::<T, String>::ExecutionInterrupted {
+        value,
+        cmd_blocks_processed: vec![],
+        cmd_blocks_not_processed: vec![],
+    }
+}
+
+fn cmd_outcome_item_error<T>(value: T) -> CmdOutcome<T, String> {
+    CmdOutcome::<T, String>::ItemError {
+        stream_outcome: StreamOutcome::finished_with(value, Vec::new()),
+        cmd_blocks_processed: vec![],
+        cmd_blocks_not_processed: vec![],
+        errors: IndexMap::new(),
+    }
+}
diff --git a/workspace_tests/src/lib.rs b/workspace_tests/src/lib.rs
index 54cddb9ac..00e967c16 100644
--- a/workspace_tests/src/lib.rs
+++ b/workspace_tests/src/lib.rs
@@ -18,6 +18,7 @@ pub(crate) mod mock_item;
 // `peace` test modules
 mod cfg;
 mod cmd;
+mod cmd_model;
 mod cmd_rt;
 mod data;
 mod diff;