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How to Integrate Graphql With Cypress?

6 minutes read

To integrate GraphQL with Cypress, you would need to set up your Cypress tests to interact with your GraphQL API. This can be done by using tools such as Apollo Client or GraphQL-request in your Cypress test code.


You would typically write custom commands in Cypress to perform GraphQL queries and mutations on your API endpoints. These commands can be used in your test scripts to make requests and assert on the responses.


It's important to handle authentication and authorization in your Cypress tests when working with GraphQL APIs. You may need to include the necessary headers or tokens in your requests to authenticate with your API server.


Overall, integrating GraphQL with Cypress involves writing custom commands and test scripts that interact with your API endpoints using GraphQL queries and mutations. With proper setup and implementation, you can efficiently test your GraphQL API with Cypress.


What are the benefits of integrating GraphQL with Cypress?

  1. Improved test coverage: By integrating GraphQL with Cypress, you can easily write end-to-end tests that cover all aspects of your application's GraphQL API, ensuring that all queries and mutations behave as expected.
  2. Faster test execution: GraphQL allows you to specify exactly the data you need in a single query, reducing the number of requests made to the server. This can lead to faster test execution times compared to traditional REST API testing.
  3. Enhanced test readability: With GraphQL, you can specify the exact data you want to retrieve in your queries, making your test scenarios more clear and concise. This can improve the readability of your test code and make it easier to maintain.
  4. Better error handling: GraphQL provides detailed error messages that can help you quickly identify and diagnose issues in your API requests. By integrating GraphQL with Cypress, you can easily capture and verify these error messages in your tests.
  5. Seamless integration with Cypress commands: Cypress provides a rich set of commands for interacting with web elements and making HTTP requests. By integrating GraphQL with Cypress, you can leverage these commands to test your GraphQL API alongside your frontend application, allowing for a more seamless testing experience.


What is the purpose of schema stitching in GraphQL integration with Cypress?

Schema stitching in GraphQL integration with Cypress is used to combine multiple GraphQL schemas into a single, unified schema. This allows developers to merge schemas from different services or APIs and provide a single endpoint for clients to interact with. This can be helpful in simplifying the client-side code and reducing the number of network requests needed to fetch data from multiple sources. Additionally, schema stitching can help improve performance by minimizing redundant data fetching and reducing latency.


How to send a GraphQL query in Cypress?

To send a GraphQL query in Cypress, you can make a POST request using the cy.request() command with the appropriate headers and body for the GraphQL query.


Here is an example of how you can send a GraphQL query in Cypress:

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cy.request({
  method: 'POST',
  url: 'https://yourgraphqlendpoint.com',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer yourAuthToken'
  },
  body: {
    query: `
      query {
        users {
          id
          name
          email
        }
      }
    `
  }
}).then((response) => {
  // Assert on the response data
  expect(response.status).to.eq(200)
  expect(response.body.data.users).to.be.an('array')
})


In this example, we are sending a POST request to a GraphQL endpoint with the query to fetch users. Make sure to replace the 'url', 'Authorization', and 'query' values with your own GraphQL endpoint URL, authentication token, and GraphQL query.


You can then use Cypress assertions to verify the response data as shown in the example.


How to test file uploads with GraphQL in Cypress?

To test file uploads with GraphQL in Cypress, you can use the cy.fixture() function to load a file as a fixture, and then send a GraphQL request with the file as a variable in the request body. Here's an example test that demonstrates how to upload a file using GraphQL in Cypress:

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describe('File Upload Test', () => {
  it('should upload a file using GraphQL API', () => {
    cy.fixture('example.pdf').then(fileContent => {
      cy.request({
        method: 'POST',
        url: 'https://your-graphql-api-url',
        headers: {
          'Content-Type': 'application/json',
        },
        body: {
          query: `
            mutation uploadFile($file: Upload!) {
              uploadFile(file: $file) {
                url
              }
            }
          `,
          variables: {
            file: fileContent,
          },
        }
      }).then(response => {
        // Assert on the response if needed
        expect(response.status).to.equal(200);
        expect(response.body.data.uploadFile.url).to.not.be.empty;
      });
    });
  });
});


In this test, we first load the file example.pdf as a fixture using cy.fixture(). Then, we send a GraphQL request using cy.request() with the query that includes a mutation to upload the file as a variable. Finally, we can assert on the response to ensure that the file was successfully uploaded.


Make sure to replace 'https://your-graphql-api-url' with the actual endpoint URL of your GraphQL API, and update the GraphQL query to match your API's schema.


Additionally, you may need to handle file uploads differently depending on how your GraphQL server expects files to be sent. Some GraphQL servers may require you to use a specific format (e.g., multipart form data) or a special file input type in your GraphQL schema. Consult your API documentation for more information on how to handle file uploads with GraphQL.


How to compare GraphQL responses in Cypress tests?

In order to compare GraphQL responses in Cypress tests, you can follow these steps:

  1. Make a GraphQL query using the cy.request() command in Cypress to send a request to the GraphQL endpoint.
  2. Capture the response using the .its() command to access the response body.
  3. Use the expect() function to compare the response with the expected data.


For example, suppose you have a GraphQL query that fetches the user with id 1:

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cy.request({
  method: 'POST',
  url: 'https://example.com/graphql',
  body: {
    query: `
      query {
        user(id: "1") {
          id
          name
          email
        }
      }
    `
  }
}).its('body').then(response => {
  const expectedUser = {
    id: '1',
    name: 'John Doe',
    email: 'johndoe@example.com'
  };

  expect(response.data.user).to.deep.equal(expectedUser);
});


By following these steps, you can compare GraphQL responses in Cypress tests and ensure that the API is returning the expected data.


How to use GraphQL aliases in Cypress tests?

To use GraphQL aliases in Cypress tests, you can follow these steps:

  1. Install the graphql-tag package by running the following command:
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npm install graphql-tag


  1. Create a reusable GraphQL query object with aliases using the gql tag from the graphql-tag package. For example:
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import gql from 'graphql-tag';

const GET_USER_INFO = gql`
  query GetUser($id: ID!) {
    user(id: $id) {
      id
      name
      email
    }
  }
`;


  1. Use the cy.request command in your Cypress test to send a GraphQL query to your server with the aliases included. For example:
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it('should fetch user info with aliases', () => {
  cy.request({
    method: 'POST',
    url: 'http://localhost:4000/graphql',
    body: {
      query: GET_USER_INFO,
      variables: {
        id: '1',
      },
    },
  }).then((response) => {
    const { user: { id, name, email } } = response.body.data;
    // Use the retrieved data as needed
    expect(id).to.equal('1');
    expect(name).to.equal('John Doe');
    expect(email).to.equal('john.doe@example.com');
  });
});


  1. Run your Cypress test to verify that the GraphQL query with aliases is executed correctly.


By following these steps, you can use GraphQL aliases in your Cypress tests to request specific fields from your GraphQL server and verify the results in your test assertions.

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