Ways to test a functional component effectively and generate a comprehensive coverage report using jest and enzyme

Question

Ways to test a functional component effectively and generate a comprehensive coverage report using jest and enzyme

I have been working on achieving a 100% test coverage report for my React project, specifically focusing on unit testing. While I understand that having full coverage is not necessary, I am determined to explore ways to cover all tests for a Stateless Functional Component (SFC) in order to achieve a perfect score.

Below is the code snippet of my component:

(Component code here...)

When I run the command "yarn test --coverage", I see the following coverage result:

update-user.component.jsx          |    66.67 |        0 |       25 |    85.71 |                73 |

Here is what my current test looks like:

(Test code here...)

My main concern now is how to ensure proper test coverage for the dispatch function getUser(). Any insights or suggestions would be greatly appreciated. Thank you!

javascript jestjs enzyme

Answer 1

Answer №1

Here is a method to test a redux action:

import { setResults } from '...';

it('Verifying that the setResults action functions as expected', () => {
    const results = ['sample result1',  'sample result2'];
    const expectedAction = {
        type: actions.SET_RESULTS,
        data: results
    };
    expect(setResults(results)).toEqual(expectedAction);
});

This is how you can test a redux reducer:

import { setResults } from '...';
import { setResultsReducer } from '...';

it('Testing state with detailedResult value when setDetailedResult(detailedResult) ' +
        'action is invoked', () => {
    const resultsValue = ['sample result1', 'sample result2'];
    expect(setResultsReducer([], setResults(resultsValue)))
            .toEqual({results: resultsValue});
});

Answer 2

Here is a method to test a redux action:

import { setResults } from '...';

it('Verifying that the setResults action functions as expected', () => {
    const results = ['sample result1',  'sample result2'];
    const expectedAction = {
        type: actions.SET_RESULTS,
        data: results
    };
    expect(setResults(results)).toEqual(expectedAction);
});

This is how you can test a redux reducer:

import { setResults } from '...';
import { setResultsReducer } from '...';

it('Testing state with detailedResult value when setDetailedResult(detailedResult) ' +
        'action is invoked', () => {
    const resultsValue = ['sample result1', 'sample result2'];
    expect(setResultsReducer([], setResults(resultsValue)))
            .toEqual({results: resultsValue});
});

Ways to test a functional component effectively and generate a comprehensive coverage report using jest and enzyme

Answer №1

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