test: [sdk-1577] add unit tests for file data initializer

Author: joker23

packages/shared/common/__tests__/internal/fdv2/FDv2ChangeSetBuilder.test.ts

@@ -0,0 +1,99 @@
+import FDv2ChangeSetBuilder from '../../../src/internal/fdv2/FDv2ChangeSetBuilder';
+import { DeleteObject, Event, PutObject } from '../../../src/internal/fdv2/proto';
+
+it('throws an error when finishing without starting', () => {
+  const builder = new FDv2ChangeSetBuilder();
+  expect(() => builder.finish()).toThrow('changeset: cannot complete without a server-intent');
+});
+
+it('starts a new changeset with the given intent', () => {
+  const builder = new FDv2ChangeSetBuilder();
+  builder.start('xfer-full');
+  const result = builder.finish();
+
+  expect(result).toBeDefined();
+  expect(result.length).toBeGreaterThan(0);
+  expect(result[0].event).toBe('server-intent');
+});
+
+it('resets events when starting a new changeset', () => {
+  const builder = new FDv2ChangeSetBuilder();
+  builder.start('xfer-full');
+  builder.putObject({ kind: 'flag', key: 'test-flag', version: 1, object: {} });
+  builder.start('xfer-full');
+  const result = builder.finish();
+
+  // Should only have server-intent and payload-transferred, no put-object events
+  const putObjectEvents = result.filter((e) => e.event === 'put-object');
+  expect(putObjectEvents.length).toBe(0);
+});
+
+it('includes server-intent as the first event with correct structure', () => {
+  const builder = new FDv2ChangeSetBuilder();
+  builder.start('xfer-full');
+  const result = builder.finish();
+
+  const serverIntentEvent = result[0] as Event;
+  expect(serverIntentEvent.event).toBe('server-intent');
+  expect(serverIntentEvent.data).toBeDefined();
+
+  const intentData = serverIntentEvent.data as any;
+  expect(intentData.payloads).toBeDefined();
+  expect(intentData.payloads.length).toBe(1);
+  expect(intentData.payloads[0].intentCode).toBe('xfer-full');
+  expect(intentData.payloads[0].id).toBe('dummy-id');
+  expect(intentData.payloads[0].target).toBe(1);
+  expect(intentData.payloads[0].reason).toBe('payload-missing');
+});
+
+it('includes payload-transferred as the last event with empty state', () => {
+  const builder = new FDv2ChangeSetBuilder();
+  builder.start('xfer-full');
+  const result = builder.finish();
+
+  const payloadTransferredEvent = result[result.length - 1] as Event;
+  expect(payloadTransferredEvent.event).toBe('payload-transferred');
+  expect(payloadTransferredEvent.data).toBeDefined();
+
+  const transferredData = payloadTransferredEvent.data as any;
+  expect(transferredData.state).toBe('');
+  expect(transferredData.version).toBe(1);
+  expect(transferredData.id).toBe('dummy-id');
+});
+
+it('includes all put and delete events between server-intent and payload-transferred', () => {
+  const builder = new FDv2ChangeSetBuilder();
+  const putObj1: PutObject = {
+    kind: 'flag',
+    key: 'flag-1',
+    version: 1,
+    object: { key: 'flag-1', on: true },
+  };
+  const deleteObj: DeleteObject = {
+    kind: 'segment',
+    key: 'segment-1',
+    version: 2,
+  };
+  const putObj2: PutObject = {
+    kind: 'flag',
+    key: 'flag-2',
+    version: 3,
+    object: { key: 'flag-2', on: false },
+  };
+
+  builder.start('xfer-full');
+  builder.putObject(putObj1);
+  builder.deleteObject(deleteObj);
+  builder.putObject(putObj2);
+  const result = builder.finish();
+
+  expect(result.length).toBe(5); // server-intent + 3 events + payload-transferred
+  expect(result[0].event).toBe('server-intent');
+  expect(result[1].event).toBe('put-object');
+  expect((result[1].data as PutObject).key).toBe('flag-1');
+  expect(result[2].event).toBe('delete-object');
+  expect((result[2].data as DeleteObject).key).toBe('segment-1');
+  expect(result[3].event).toBe('put-object');
+  expect((result[3].data as PutObject).key).toBe('flag-2');
+  expect(result[4].event).toBe('payload-transferred');
+});