diff --git a/tests/domain/spline-corridor-junction.command.test.ts b/tests/domain/spline-corridor-junction.command.test.ts
new file mode 100644
index 00000000..5d255e9b
--- /dev/null
+++ b/tests/domain/spline-corridor-junction.command.test.ts
@@ -0,0 +1,128 @@
+import { describe, expect, it } from "vitest";
+
+import { createEditorStore } from "../../src/app/editor-store";
+import { createDeletePathCommand } from "../../src/commands/delete-path-command";
+import { createDeleteSplineCorridorJunctionCommand } from "../../src/commands/delete-spline-corridor-junction-command";
+import { createUpsertPathCommand } from "../../src/commands/upsert-path-command";
+import { createUpsertSplineCorridorJunctionCommand } from "../../src/commands/upsert-spline-corridor-junction-command";
+import { createScenePath } from "../../src/document/paths";
+import { createEmptySceneDocument } from "../../src/document/scene-document";
+import { createSplineCorridorJunction } from "../../src/document/spline-corridor-junctions";
+
+describe("spline corridor junction commands", () => {
+  it("creates, updates, deletes, undoes, and redoes junctions", () => {
+    const store = createEditorStore({
+      initialDocument: createEmptySceneDocument()
+    });
+    const pathA = createScenePath({ id: "path-junction-command-a" });
+    const pathB = createScenePath({ id: "path-junction-command-b" });
+    const junction = createSplineCorridorJunction({
+      id: "junction-command",
+      center: { x: 1, y: 0, z: 2 },
+      radius: 2,
+      connections: [
+        { pathId: pathA.id, progress: 0.5, clipDistance: 2 },
+        { pathId: pathB.id, progress: 0.25, clipDistance: 2 }
+      ]
+    });
+
+    store.executeCommand(createUpsertPathCommand({ path: pathA }));
+    store.executeCommand(createUpsertPathCommand({ path: pathB }));
+    store.executeCommand(
+      createUpsertSplineCorridorJunctionCommand({ junction })
+    );
+
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]
+    ).toEqual(junction);
+
+    store.executeCommand(
+      createUpsertSplineCorridorJunctionCommand({
+        junction: createSplineCorridorJunction({
+          ...junction,
+          radius: 3
+        })
+      })
+    );
+
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]?.radius
+    ).toBe(3);
+
+    store.executeCommand(createDeleteSplineCorridorJunctionCommand(junction.id));
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]
+    ).toBeUndefined();
+
+    expect(store.undo()).toBe(true);
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]?.radius
+    ).toBe(3);
+
+    expect(store.undo()).toBe(true);
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]?.radius
+    ).toBe(2);
+
+    expect(store.redo()).toBe(true);
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]?.radius
+    ).toBe(3);
+  });
+
+  it("removes invalid junction connections when deleting paths and restores them on undo", () => {
+    const pathA = createScenePath({ id: "path-junction-delete-a" });
+    const pathB = createScenePath({ id: "path-junction-delete-b" });
+    const pathC = createScenePath({ id: "path-junction-delete-c" });
+    const junction = createSplineCorridorJunction({
+      id: "junction-delete",
+      center: { x: 0, y: 0, z: 0 },
+      connections: [
+        { pathId: pathA.id, progress: 0, clipDistance: 1.5 },
+        { pathId: pathB.id, progress: 0.5, clipDistance: 1.5 },
+        { pathId: pathC.id, progress: 1, clipDistance: 1.5 }
+      ]
+    });
+    const store = createEditorStore({
+      initialDocument: {
+        ...createEmptySceneDocument(),
+        paths: {
+          [pathA.id]: pathA,
+          [pathB.id]: pathB,
+          [pathC.id]: pathC
+        },
+        splineCorridorJunctions: {
+          [junction.id]: junction
+        }
+      }
+    });
+
+    store.executeCommand(createDeletePathCommand(pathA.id));
+
+    expect(
+      store
+        .getState()
+        .document.splineCorridorJunctions[junction.id]?.connections.map(
+          (connection) => connection.pathId
+        )
+    ).toEqual([pathB.id, pathC.id]);
+
+    store.executeCommand(createDeletePathCommand(pathB.id));
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]
+    ).toBeUndefined();
+
+    expect(store.undo()).toBe(true);
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]
+        ?.connections
+    ).toHaveLength(2);
+
+    expect(store.undo()).toBe(true);
+    expect(
+      store.getState().document.splineCorridorJunctions[junction.id]
+        ?.connections
+    ).toHaveLength(3);
+  });
+});
+
diff --git a/tests/serialization/scene-document-json.test.ts b/tests/serialization/scene-document-json.test.ts
index 577a1ea7..ba6623f7 100644
--- a/tests/serialization/scene-document-json.test.ts
+++ b/tests/serialization/scene-document-json.test.ts
@@ -68,6 +68,7 @@ import {
   SCENE_DOCUMENT_VERSION,
   SHADER_SKY_HORIZON_HEIGHT_SCENE_DOCUMENT_VERSION,
   SHADER_SKY_SCENE_DOCUMENT_VERSION,
+  SPLINE_CORRIDOR_JUNCTIONS_SCENE_DOCUMENT_VERSION,
   SPLINE_CORRIDOR_COLLISION_SCENE_DOCUMENT_VERSION,
   SPLINE_REPEATERS_SCENE_DOCUMENT_VERSION,
   SPLINE_ROAD_EDGES_SCENE_DOCUMENT_VERSION,
@@ -123,6 +124,7 @@ import {
 } from "../../src/serialization/scene-document-json";
 import { BUNDLED_FOLIAGE_PROTOTYPES } from "../../src/foliage/bundled-foliage-manifest";
 import { createFoliageLayer } from "../../src/foliage/foliage";
+import { createSplineCorridorJunction } from "../../src/document/spline-corridor-junctions";
 
 describe("scene document JSON", () => {
   it("round-trips the current empty schema", () => {