सेट नहीं कर सकता के मूल्य का चयन करें तत्व घटक के अंदर के साथ एंजाइम

मैं कोशिश कर रहा हूँ करने के लिए निर्धारित मूल्य के लिए एक का चयन करें तत्व के अंदर Dropdown घटक है, लेकिन परीक्षण असफल रहता है.

यहाँ है एक codesandbox के घटक परीक्षण करने के लिए.

it('should execute onChange once and change value to "item2"', () => {
        const onChangeMock = jest.fn();
        const wrapper = mount(
            <Dropdown{ ...args } 
                onChange={ onChangeMock } 
                listItems={ ['item1', 'item2', 'item3'] } />
        );

    
        wrapper.find('select').simulate('change', { value: 'item2' });

        console.log(wrapper.debug());
        console.log(wrapper.find('select').props());
        
        expect(wrapper.find('select').props().value).toBe('item2');
        expect(onChangeMock.mock.calls.length).toBe(1);
    });

के बाद उत्पादन चल रहा है npm run test:

 expect(received).toBe(expected) // Object.is equality
 Expected: "item2"
 Received: undefined

 51 |         console.log(wrapper.find('select').props());
 52 |         
 53 |         expect(wrapper.find('select').props().value).toBe('item2');
    |                                                      ^
 54 |         expect(onChangeMock.mock.calls.length).toBe(1);
 55 |     });
 56 | });

console.log
    <Dropdown id="" name="" label="" placeholder="" errorMessage="" valid={false} required={false} listItems={{...}} onChange={[Function: mockConstructor] { _isMockFunction: true, getMockImplementation: [Function (anonymous)], mock: Object [Object: null prototype] { calls: [ [ SyntheticBaseEvent { _reactName: 'onChange', _targetInst: [Object], type: 'change', nativeEvent: [Object], target: [Object], currentTarget: null, eventPhase: undefined, bubbles: undefined, cancelable: undefined, timeStamp: 1637655017281, defaultPrevented: undefined, isTrusted: undefined, isDefaultPrevented: [Function: functionThatReturnsFalse], isPropagationStopped: [Function: functionThatReturnsFalse], value: 'item2', _dispatchListeners: null, _dispatchInstances: null } ] ], instances: [ undefined ], invocationCallOrder: [ 1 ], results: [ Object [Object: null prototype] { type: 'return', value: undefined } ] }, mockClear: [Function (anonymous)], mockReset: [Function (anonymous)], mockRestore: [Function (anonymous)], mockReturnValueOnce: [Function (anonymous)], mockResolvedValueOnce: [Function (anonymous)], mockRejectedValueOnce: [Function (anonymous)], mockReturnValue: [Function (anonymous)], mockResolvedValue: [Function (anonymous)], mockRejectedValue: [Function (anonymous)], mockImplementationOnce: [Function (anonymous)], mockImplementation: [Function (anonymous)], mockReturnThis: [Function (anonymous)], mockName: [Function (anonymous)], getMockName: [Function (anonymous)] }}>
      <div className="med-dropdown">
        <label htmlFor="" className="med-dropdown__label">
           (Optional)
        </label>
        <select id="" name="" className="med-dropdown__select false" defaultValue={0} onChange={[Function: mockConstructor] { _isMockFunction: true, getMockImplementation: [Function (anonymous)], mock: Object [Object: null prototype] { calls: [ [ SyntheticBaseEvent { _reactName: 'onChange', _targetInst: [Object], type: 'change', nativeEvent: [Object], target: [Object], currentTarget: null, eventPhase: undefined, bubbles: undefined, cancelable: undefined, timeStamp: 1637655017281, defaultPrevented: undefined, isTrusted: undefined, isDefaultPrevented: [Function: functionThatReturnsFalse], isPropagationStopped: [Function: functionThatReturnsFalse], value: 'item2', _dispatchListeners: null, _dispatchInstances: null } ] ], instances: [ undefined ], invocationCallOrder: [ 1 ], results: [ Object [Object: null prototype] { type: 'return', value: undefined } ] }, mockClear: [Function (anonymous)], mockReset: [Function (anonymous)], mockRestore: [Function (anonymous)], mockReturnValueOnce: [Function (anonymous)], mockResolvedValueOnce: [Function (anonymous)], mockRejectedValueOnce: [Function (anonymous)], mockReturnValue: [Function (anonymous)], mockResolvedValue: [Function (anonymous)], mockRejectedValue: [Function (anonymous)], mockImplementationOnce: [Function (anonymous)], mockImplementation: [Function (anonymous)], mockReturnThis: [Function (anonymous)], mockName: [Function (anonymous)], getMockName: [Function (anonymous)] }} onFocus={[Function: onFocus]} onBlur={[Function: onBlur]} disabled={[undefined]}>
          <option disabled={true} value={0} />
          <option value="item1">
            item1
          </option>
          <option value="item2">
            item2
          </option>
          <option value="item3">
            item3
          </option>
        </select>
      </div>
    </Dropdown>