diff --git a/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs b/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs
index 35bb510..2dd84bd 100644
--- a/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs
+++ b/testing-framework/core/src/scenario/runtime/orchestration/source_orchestration_plan.rs
@@ -69,7 +69,19 @@ impl SourceOrchestrationPlan {
 #[cfg(test)]
 mod tests {
     use super::{SourceOrchestrationMode, SourceOrchestrationPlan};
-    use crate::scenario::{ExistingCluster, sources::ScenarioSources};
+    use crate::scenario::{ExistingCluster, ExternalNodeSource, sources::ScenarioSources};
+
+    #[test]
+    fn managed_sources_are_planned() {
+        let plan = SourceOrchestrationPlan::try_from_sources(&ScenarioSources::default())
+            .expect("managed sources should build a source orchestration plan");
+
+        assert!(matches!(
+            plan.mode(),
+            SourceOrchestrationMode::Managed { .. }
+        ));
+        assert!(plan.external_sources().is_empty());
+    }
 
     #[test]
     fn attached_sources_are_planned() {
@@ -86,6 +98,46 @@ mod tests {
             SourceOrchestrationMode::Attached { .. }
         ));
     }
+
+    #[test]
+    fn attached_sources_keep_external_nodes() {
+        let sources = ScenarioSources::default()
+            .with_attach(ExistingCluster::for_compose_project(
+                "test-project".to_string(),
+            ))
+            .with_external_node(ExternalNodeSource::new(
+                "external-0".to_owned(),
+                "http://127.0.0.1:1".to_owned(),
+            ));
+        let plan = SourceOrchestrationPlan::try_from_sources(&sources)
+            .expect("attached sources with external nodes should build");
+
+        assert!(matches!(
+            plan.mode(),
+            SourceOrchestrationMode::Attached { .. }
+        ));
+        assert_eq!(plan.external_sources().len(), 1);
+        assert_eq!(plan.external_sources()[0].label(), "external-0");
+    }
+
+    #[test]
+    fn external_only_sources_are_planned() {
+        let sources = ScenarioSources::default()
+            .with_external_node(ExternalNodeSource::new(
+                "external-0".to_owned(),
+                "http://127.0.0.1:1".to_owned(),
+            ))
+            .into_external_only();
+        let plan = SourceOrchestrationPlan::try_from_sources(&sources)
+            .expect("external-only sources should build a source orchestration plan");
+
+        assert!(matches!(
+            plan.mode(),
+            SourceOrchestrationMode::ExternalOnly { .. }
+        ));
+        assert_eq!(plan.external_sources().len(), 1);
+        assert_eq!(plan.external_sources()[0].label(), "external-0");
+    }
 }
 
 fn mode_from_sources(sources: &ScenarioSources) -> SourceOrchestrationMode {