Include external models in project snapshots

tests/project-state-snapshot.test.ts

@@ -32,6 +32,12 @@ function minimalSnapshot() {
     },
     distributionBoards: [],
     externalCsvConfiguration: null,
+    externalModel: {
+      source: null,
+      importBatches: [],
+      roomMappings: [],
+      objects: [],
+    },
     circuitLists: [],
     circuitSections: [],
     distributionBoardComponents: [],
@@ -149,6 +155,7 @@ describe("project state snapshot model", () => {
     baseline.schemaVersion = 1 as typeof baseline.schemaVersion;
     delete (baseline.project as Record<string, unknown>).isPublicBuilding;
     delete (baseline as Record<string, unknown>).externalCsvConfiguration;
+    delete (baseline as Record<string, unknown>).externalModel;
 
     const upgraded = parseProjectStateSnapshot(baseline);
 
@@ -161,11 +168,35 @@ describe("project state snapshot model", () => {
     const previous = structuredClone(minimalSnapshot());
     previous.schemaVersion = 2 as typeof previous.schemaVersion;
     delete (previous as Record<string, unknown>).externalCsvConfiguration;
+    delete (previous as Record<string, unknown>).externalModel;
 
     const upgraded = parseProjectStateSnapshot(previous);
 
     assert.equal(upgraded.schemaVersion, projectStateSnapshotSchemaVersion);
     assert.equal(upgraded.externalCsvConfiguration, null);
+    assert.deepEqual(upgraded.externalModel, {
+      source: null,
+      importBatches: [],
+      roomMappings: [],
+      objects: [],
+    });
+  });
+
+  it("upgrades snapshot version 3 with an empty external model", () => {
+    const previous = structuredClone(minimalSnapshot());
+    previous.schemaVersion = 3 as typeof previous.schemaVersion;
+    delete (previous as Record<string, unknown>).externalModel;
+
+    const upgraded = parseProjectStateSnapshot(previous);
+
+    assert.equal(upgraded.schemaVersion, projectStateSnapshotSchemaVersion);
+    assert.equal(upgraded.externalCsvConfiguration, null);
+    assert.deepEqual(upgraded.externalModel, {
+      source: null,
+      importBatches: [],
+      roomMappings: [],
+      objects: [],
+    });
   });
 
   it("rejects malformed baseline and unknown snapshot shapes", () => {