test: add test for schema factory

tests/e2e/schema.factory.spec.ts

@@ -1,4 +1,5 @@
-import { Prop, Schema, SchemaFactory } from '../../lib';
+import { VirtualTypeOptions } from 'mongoose';
+import { Prop, Schema, SchemaFactory, Virtual } from '../../lib';
 
 @Schema({ validateBeforeSave: false, _id: true, autoIndex: true })
 class ChildClass {
@@ -9,6 +10,9 @@ class ChildClass {
   name: string;
 }
 
+const getterFunctionMock = jest.fn();
+const setterFunctionMock = jest.fn();
+
 @Schema({
   validateBeforeSave: false,
   _id: true,
@@ -24,6 +28,21 @@ class ExampleClass {
 
   @Prop()
   array: Array<any>;
+
+  @Virtual({
+    options: {
+      localField: 'array',
+      ref: 'ChildClass',
+      foreignField: 'id',
+    },
+  })
+  virtualPropsWithOptions: Array<ChildClass>;
+
+  @Virtual({
+    get: getterFunctionMock,
+    set: setterFunctionMock,
+  })
+  virtualPropsWithGetterSetterFunctions: Array<ChildClass>;
 }
 
 describe('SchemaFactory', () => {
@@ -50,4 +69,38 @@ describe('SchemaFactory', () => {
       }),
     );
   });
+
+  it('should define for schema a virtuals with options', () => {
+    const {
+      virtuals: { virtualPropsWithOptions },
+    } = SchemaFactory.createForClass(ExampleClass) as any;
+
+    expect(virtualPropsWithOptions).toEqual(
+      expect.objectContaining({
+        path: 'virtualPropsWithOptions',
+        setters: [expect.any(Function)],
+        getters: [],
+        options: expect.objectContaining({
+          localField: 'array',
+          ref: 'ChildClass',
+          foreignField: 'id',
+        }),
+      }),
+    );
+  });
+
+  it('should define for schema a virtual with getter/setter functions', () => {
+    const {
+      virtuals: { virtualPropsWithGetterSetterFunctions },
+    } = SchemaFactory.createForClass(ExampleClass) as any;
+
+    expect(virtualPropsWithGetterSetterFunctions).toEqual(
+      expect.objectContaining({
+        path: 'virtualPropsWithGetterSetterFunctions',
+        setters: [setterFunctionMock],
+        getters: [getterFunctionMock],
+        options: {},
+      }),
+    );
+  });
 });