add jest mockName and getMockName (#22682)

types/jest/index.d.ts

@@ -533,6 +533,8 @@ declare namespace jest {
         mockReturnThis(): Mock<T>;
         mockReturnValue(value: any): Mock<T>;
         mockReturnValueOnce(value: any): Mock<T>;
+        mockName(name: string): Mock<T>;
+        getMockName(): string;
     }
 
     interface MockContext<T> {

types/jest/jest-tests.ts

@@ -311,7 +311,7 @@ describe('missing tests', () => {
        expect(jest.isMockFunction(spy)).toBeTruthy();
    });
 
-    it('tests all mising Mocks functionality', () => {
+    it('tests all missing Mocks functionality', () => {
        type FruitsGetter = () => string[];
        const mock: jest.Mock<FruitsGetter> = jest.fn<FruitsGetter>();
        mock.mockImplementationOnce(() => ['Orange', 'Apple', 'Plum']);
@@ -328,6 +328,12 @@ describe('missing tests', () => {
        expect(thisMock()).toBe(this);
    });
 
+    it('tests mock name functionality', () => {
+        const mock: jest.Mock = jest.fn();
+        mock.mockName('Carrot');
+        expect(mock.getMockName()).toBe('Carrot');
+    });
+
     it('creates snapshoter', () => {
        jest.disableAutomock().mock('./render', () => jest.fn((): string => "{Link to: \"facebook\"}"), { virtual: true });
        const render: () => string = require('./render');