My react app works correctly, but tests not










1















Unit test returns error, but when I launch my app everything works.



The problem is, that when callOnSubmitWithData() is returned in arrow function as onPress callback, mocked onSubmit function is not called, but in launched app everything works.



Unit test in Jest with enzyme:




const setup = (propOverrides) => 
const props = Object.assign(
fields: ,
error: '',
onSubmit()
, propOverrides);

const wrapper = shallow(
<Form ...props/>
);

return
props,
wrapper
;
;

it('sends fields data to callback after push submit button', () =>
const inputValue = 'Some text';
const submitCallback = jest.fn();

const wrapper, props = setup(
onSubmit: submitCallback,
fields: [

key: 'first',
value: inputValue
,

key: 'second',
value: inputValue

]
);

const output =
[props.fields[0].key]: inputValue,
[props.fields[1].key]: inputValue
;

wrapper.setState(isSubmitDisabled: false);
wrapper.update();
wrapper.find(Button).simulate('click');

expect(submitCallback).toHaveBeenCalledWith(output);
);





And my part of my component:






class Form extends React.Component 
constructor(props)
super(props);

//Create State

//Other bindings
this.callOnSubmitWithData = this.callOnSubmitWithData.bind(this);


//...

callOnSubmitWithData()
const data = this.extractFieldsData();
this.props.onSubmit(data);


extractFieldsData()
//Returns object with all fields values


render()
const fields, error, buttonTitle = this.props;

return (
<View>
<View>

fields.map((data) =>
//...
return (<AuthTextInput/>);
)

</View>

<Button
title=buttonTitle
onPress=() => this.callOnSubmitWithData()
disabled=this.state.isSubmitDisabled
/>
</View>
);



export default Form;












share|improve this question




























    1















    Unit test returns error, but when I launch my app everything works.



    The problem is, that when callOnSubmitWithData() is returned in arrow function as onPress callback, mocked onSubmit function is not called, but in launched app everything works.



    Unit test in Jest with enzyme:




    const setup = (propOverrides) => 
    const props = Object.assign(
    fields: ,
    error: '',
    onSubmit()
    , propOverrides);

    const wrapper = shallow(
    <Form ...props/>
    );

    return
    props,
    wrapper
    ;
    ;

    it('sends fields data to callback after push submit button', () =>
    const inputValue = 'Some text';
    const submitCallback = jest.fn();

    const wrapper, props = setup(
    onSubmit: submitCallback,
    fields: [

    key: 'first',
    value: inputValue
    ,

    key: 'second',
    value: inputValue

    ]
    );

    const output =
    [props.fields[0].key]: inputValue,
    [props.fields[1].key]: inputValue
    ;

    wrapper.setState(isSubmitDisabled: false);
    wrapper.update();
    wrapper.find(Button).simulate('click');

    expect(submitCallback).toHaveBeenCalledWith(output);
    );





    And my part of my component:






    class Form extends React.Component 
    constructor(props)
    super(props);

    //Create State

    //Other bindings
    this.callOnSubmitWithData = this.callOnSubmitWithData.bind(this);


    //...

    callOnSubmitWithData()
    const data = this.extractFieldsData();
    this.props.onSubmit(data);


    extractFieldsData()
    //Returns object with all fields values


    render()
    const fields, error, buttonTitle = this.props;

    return (
    <View>
    <View>

    fields.map((data) =>
    //...
    return (<AuthTextInput/>);
    )

    </View>

    <Button
    title=buttonTitle
    onPress=() => this.callOnSubmitWithData()
    disabled=this.state.isSubmitDisabled
    />
    </View>
    );



    export default Form;












    share|improve this question


























      1












      1








      1








      Unit test returns error, but when I launch my app everything works.



      The problem is, that when callOnSubmitWithData() is returned in arrow function as onPress callback, mocked onSubmit function is not called, but in launched app everything works.



      Unit test in Jest with enzyme:




      const setup = (propOverrides) => 
      const props = Object.assign(
      fields: ,
      error: '',
      onSubmit()
      , propOverrides);

      const wrapper = shallow(
      <Form ...props/>
      );

      return
      props,
      wrapper
      ;
      ;

      it('sends fields data to callback after push submit button', () =>
      const inputValue = 'Some text';
      const submitCallback = jest.fn();

      const wrapper, props = setup(
      onSubmit: submitCallback,
      fields: [

      key: 'first',
      value: inputValue
      ,

      key: 'second',
      value: inputValue

      ]
      );

      const output =
      [props.fields[0].key]: inputValue,
      [props.fields[1].key]: inputValue
      ;

      wrapper.setState(isSubmitDisabled: false);
      wrapper.update();
      wrapper.find(Button).simulate('click');

      expect(submitCallback).toHaveBeenCalledWith(output);
      );





      And my part of my component:






      class Form extends React.Component 
      constructor(props)
      super(props);

      //Create State

      //Other bindings
      this.callOnSubmitWithData = this.callOnSubmitWithData.bind(this);


      //...

      callOnSubmitWithData()
      const data = this.extractFieldsData();
      this.props.onSubmit(data);


      extractFieldsData()
      //Returns object with all fields values


      render()
      const fields, error, buttonTitle = this.props;

      return (
      <View>
      <View>

      fields.map((data) =>
      //...
      return (<AuthTextInput/>);
      )

      </View>

      <Button
      title=buttonTitle
      onPress=() => this.callOnSubmitWithData()
      disabled=this.state.isSubmitDisabled
      />
      </View>
      );



      export default Form;












      share|improve this question
















      Unit test returns error, but when I launch my app everything works.



      The problem is, that when callOnSubmitWithData() is returned in arrow function as onPress callback, mocked onSubmit function is not called, but in launched app everything works.



      Unit test in Jest with enzyme:




      const setup = (propOverrides) => 
      const props = Object.assign(
      fields: ,
      error: '',
      onSubmit()
      , propOverrides);

      const wrapper = shallow(
      <Form ...props/>
      );

      return
      props,
      wrapper
      ;
      ;

      it('sends fields data to callback after push submit button', () =>
      const inputValue = 'Some text';
      const submitCallback = jest.fn();

      const wrapper, props = setup(
      onSubmit: submitCallback,
      fields: [

      key: 'first',
      value: inputValue
      ,

      key: 'second',
      value: inputValue

      ]
      );

      const output =
      [props.fields[0].key]: inputValue,
      [props.fields[1].key]: inputValue
      ;

      wrapper.setState(isSubmitDisabled: false);
      wrapper.update();
      wrapper.find(Button).simulate('click');

      expect(submitCallback).toHaveBeenCalledWith(output);
      );





      And my part of my component:






      class Form extends React.Component 
      constructor(props)
      super(props);

      //Create State

      //Other bindings
      this.callOnSubmitWithData = this.callOnSubmitWithData.bind(this);


      //...

      callOnSubmitWithData()
      const data = this.extractFieldsData();
      this.props.onSubmit(data);


      extractFieldsData()
      //Returns object with all fields values


      render()
      const fields, error, buttonTitle = this.props;

      return (
      <View>
      <View>

      fields.map((data) =>
      //...
      return (<AuthTextInput/>);
      )

      </View>

      <Button
      title=buttonTitle
      onPress=() => this.callOnSubmitWithData()
      disabled=this.state.isSubmitDisabled
      />
      </View>
      );



      export default Form;








      const setup = (propOverrides) => 
      const props = Object.assign(
      fields: ,
      error: '',
      onSubmit()
      , propOverrides);

      const wrapper = shallow(
      <Form ...props/>
      );

      return
      props,
      wrapper
      ;
      ;

      it('sends fields data to callback after push submit button', () =>
      const inputValue = 'Some text';
      const submitCallback = jest.fn();

      const wrapper, props = setup(
      onSubmit: submitCallback,
      fields: [

      key: 'first',
      value: inputValue
      ,

      key: 'second',
      value: inputValue

      ]
      );

      const output =
      [props.fields[0].key]: inputValue,
      [props.fields[1].key]: inputValue
      ;

      wrapper.setState(isSubmitDisabled: false);
      wrapper.update();
      wrapper.find(Button).simulate('click');

      expect(submitCallback).toHaveBeenCalledWith(output);
      );





      const setup = (propOverrides) => 
      const props = Object.assign(
      fields: ,
      error: '',
      onSubmit()
      , propOverrides);

      const wrapper = shallow(
      <Form ...props/>
      );

      return
      props,
      wrapper
      ;
      ;

      it('sends fields data to callback after push submit button', () =>
      const inputValue = 'Some text';
      const submitCallback = jest.fn();

      const wrapper, props = setup(
      onSubmit: submitCallback,
      fields: [

      key: 'first',
      value: inputValue
      ,

      key: 'second',
      value: inputValue

      ]
      );

      const output =
      [props.fields[0].key]: inputValue,
      [props.fields[1].key]: inputValue
      ;

      wrapper.setState(isSubmitDisabled: false);
      wrapper.update();
      wrapper.find(Button).simulate('click');

      expect(submitCallback).toHaveBeenCalledWith(output);
      );





      class Form extends React.Component 
      constructor(props)
      super(props);

      //Create State

      //Other bindings
      this.callOnSubmitWithData = this.callOnSubmitWithData.bind(this);


      //...

      callOnSubmitWithData()
      const data = this.extractFieldsData();
      this.props.onSubmit(data);


      extractFieldsData()
      //Returns object with all fields values


      render()
      const fields, error, buttonTitle = this.props;

      return (
      <View>
      <View>

      fields.map((data) =>
      //...
      return (<AuthTextInput/>);
      )

      </View>

      <Button
      title=buttonTitle
      onPress=() => this.callOnSubmitWithData()
      disabled=this.state.isSubmitDisabled
      />
      </View>
      );



      export default Form;





      class Form extends React.Component 
      constructor(props)
      super(props);

      //Create State

      //Other bindings
      this.callOnSubmitWithData = this.callOnSubmitWithData.bind(this);


      //...

      callOnSubmitWithData()
      const data = this.extractFieldsData();
      this.props.onSubmit(data);


      extractFieldsData()
      //Returns object with all fields values


      render()
      const fields, error, buttonTitle = this.props;

      return (
      <View>
      <View>

      fields.map((data) =>
      //...
      return (<AuthTextInput/>);
      )

      </View>

      <Button
      title=buttonTitle
      onPress=() => this.callOnSubmitWithData()
      disabled=this.state.isSubmitDisabled
      />
      </View>
      );



      export default Form;






      javascript reactjs jestjs






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      edited Nov 13 '18 at 9:56









      skyboyer

      3,61611128




      3,61611128










      asked Jun 21 '18 at 10:03









      Szustka124Szustka124

      215




      215






















          1 Answer
          1






          active

          oldest

          votes


















          1














          The reason is simulate(). You attach handler to onPress but calling simulate('click').



          You need to call exactly onPress. Maybe simulate('press') will work.



          If not you can just



          wrapper.find(Button).props().onPress();
          wrapper.update();


          and then your mock will be run.






          share|improve this answer






















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            1 Answer
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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            The reason is simulate(). You attach handler to onPress but calling simulate('click').



            You need to call exactly onPress. Maybe simulate('press') will work.



            If not you can just



            wrapper.find(Button).props().onPress();
            wrapper.update();


            and then your mock will be run.






            share|improve this answer



























              1














              The reason is simulate(). You attach handler to onPress but calling simulate('click').



              You need to call exactly onPress. Maybe simulate('press') will work.



              If not you can just



              wrapper.find(Button).props().onPress();
              wrapper.update();


              and then your mock will be run.






              share|improve this answer

























                1












                1








                1







                The reason is simulate(). You attach handler to onPress but calling simulate('click').



                You need to call exactly onPress. Maybe simulate('press') will work.



                If not you can just



                wrapper.find(Button).props().onPress();
                wrapper.update();


                and then your mock will be run.






                share|improve this answer













                The reason is simulate(). You attach handler to onPress but calling simulate('click').



                You need to call exactly onPress. Maybe simulate('press') will work.



                If not you can just



                wrapper.find(Button).props().onPress();
                wrapper.update();


                and then your mock will be run.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 13 '18 at 10:11









                skyboyerskyboyer

                3,61611128




                3,61611128



























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