test: add test for issue #2149

Closes #2149

tests/features/embeddables/GH2149.test.ts

@@ -0,0 +1,57 @@
+import { Embeddable, Embedded, Entity, MikroORM, PrimaryKey, Property } from '@mikro-orm/core';
+
+@Embeddable()
+export class LoopOptions {
+
+  @Property()
+  enabled = false;
+
+  @Property()
+  type = 'a';
+
+}
+
+@Embeddable()
+export class Options {
+
+  @Embedded(() => LoopOptions, { object: true })
+  loop = new LoopOptions();
+
+}
+
+@Entity()
+export class PlayerEntity {
+
+  @PrimaryKey()
+  id!: number;
+
+  @Embedded(() => Options, { object: true })
+  options = new Options();
+
+}
+
+describe('GH issue 2149', () => {
+
+  let orm: MikroORM;
+
+  beforeAll(async () => {
+    orm = await MikroORM.init({
+      entities: [PlayerEntity, Options, LoopOptions],
+      dbName: 'test',
+      type: 'mongo',
+    }, false);
+  });
+
+  afterAll(async () => {
+    await orm.close();
+  });
+
+  test(`GH issue 1912`, async () => {
+    const e = new PlayerEntity();
+    expect(e.options).toBeInstanceOf(Options);
+    expect(e.options.loop).toBeInstanceOf(LoopOptions);
+    expect(e.options.loop.enabled).toBe(false);
+    expect(e.options.loop.type).toBe('a');
+  });
+
+});