How to use the test-drive-react.simulate.blur function in test-drive-react

it('should only call onChange once', async () => {
        const onChange = sinon.spy();
        const {select, waitForDom} = clientRenderer.render();
        const datePickerInput = select(datePickerInputId);

        trigger.change(datePickerInput!, '2017/02/01');
        simulate.blur(datePickerInput);

        await waitForDom(() => expect(onChange).to.have.been.calledOnce);
    });

it('should set focus on hh on first input', () => {
                        simulate.blur(secondInputMM);
                        simulate.focus(firstStepperUp);
                        simulate.click(firstStepperUp);
                        expect(document.activeElement === firstInputHH).to.be.true;
                    });
                });

await waitForDom(() => {
                        const input = select('NATIVE_INPUT_NUMBER') as HTMLInputElement;

                        simulateKeyInput(input, '1');
                        simulateKeyInput(input, '2');
                        simulateKeyInput(input, '3');

                        simulate.blur(input);

                        assertCommit(input, onChange, 123);
                    });
                });

beforeEach(() => {
                    simulate.blur(firstInputMM);
                    simulate.click(secondInputMM);
                    simulate.focus(secondInputMM);
                });
                describe.skip('click on stepper in first input', () => {

public blur(): void {
        simulate.blur(this.root);
    }

public blur() {
        simulate.blur(this.nativeInput);
    }
}

public changeDate(value: string): void {
        trigger.change(this.input, value);
        simulate.blur(this.input);
    }