How to test button prop in enzyme - reactjs

Question

Trying to test this component, and im getting this
error
TypeError: this.props.onItemAdded is not a function
I've referenced this but this solution doesn't really apply to my problem
Enzyme test: TypeError: expect(...).find is not a function
How would i test the button functionality being that the button is a prop ?
todo-add-item.test.js
import React from "react";
import { shallow } from "enzyme";
import TodoAddItem from './todo-add-item';
describe('Should render add item component', ()=> {
it('should render add item component', () => {
const wrapper = shallow(<TodoAddItem/>)
})
})
describe('Should simulate button click', ()=> {
it('should simulate button click', () => {
const wrapper =shallow(<TodoAddItem/>)
wrapper.find('button').simulate('click') // getting the type error here.
})
})
todo-add-item.js
import React, { Component } from 'react';
import './todo-add-item.css';
export default class TodoAddItem extends Component {
render() {
return (
<div className="todo-add-item">
<button
className="test-button btn btn-outline-secondary float-left"
onClick={() => this.props.onItemAdded('Hello world')}>
Add Item
</button>
</div>
);
}
}
app.js
import React, { Component } from 'react';
import AppHeader from '../app-header';
import SearchPanel from '../search-panel';
import TodoList from '../todo-list';
import ItemStatusFilter from '../item-status-filter';
import TodoAddItem from '../todo-add-item';
import './app.css';
export default class App extends Component {
constructor() {
super();
this.createTodoItem = (label) => {
return {
label,
important: false,
done: false,
id: this.maxId++
}
};
this.maxId = 100;
this.state = {
todoData: [
this.createTodoItem('Drink Coffee'),
this.createTodoItem('Make Awesome App'),
this.createTodoItem('Have a lunch')
]
};
this.deleteItem = (id) => {
this.setState(({ todoData }) => {
const idx = todoData.findIndex((el) => el.id === id);
const newArray = [
...todoData.slice(0, idx),
...todoData.slice(idx + 1)
];
return {
todoData: newArray
};
});
};
this.addItem = (text) => {
const newItem = this.createTodoItem(text);
this.setState(({ todoData }) => {
const newArray = [
...todoData,
newItem
];
return {
todoData: newArray
};
});
};
this.onToggleImportant = (id) => {
console.log('toggle important', id);
};
this.onToggleDone = (id) => {
console.log('toggle done', id);
};
};
render() {
return (
<div className="todo-app">
<AppHeader toDo={ 1 } done={ 3 } />
<div className="top-panel d-flex">
<SearchPanel />
<ItemStatusFilter />
</div>
<TodoList
todos={ this.state.todoData }
onDeleted={ this.deleteItem }
onToggleImportant={ this.onToggleImportant }
onToggleDone={ this.onToggleDone } />
<TodoAddItem onItemAdded={ this.addItem } />
</div>
);
};
};

Answer 1

You don't pass any props to your component.
const wrapper =shallow(<TodoAddItem onItemAdded={() => jest.fn()}/>)
You can check props with .props()
Eg:
console.log('props',wrapper.find('button').props());