How to use the graphql-playground-middleware-express.default.mockReturnValueOnce function in graphql-playground-middleware-express
To help you get started, we’ve selected a few graphql-playground-middleware-express examples, based on popular ways it is used in public projects.
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Jordaneisenburger / fallback-studio / src / pwa-studio / packages / pwa-buildpack / lib / WebpackTools / __tests__ / PWADevServer.spec.js View on Github 
test('graphql-playground middleware handles error during project query read', async () => {
const config = mockConfig();
fs.readFile.mockImplementation((p, opts, cb) =>
cb(new Error(`ENOENT: ${p} not found`))
);
const middleware = jest.fn();
playgroundMiddleware.mockReturnValueOnce(middleware);
await PWADevServer.configure({ graphqlPlayground: true }, config);
expect(config.devServer.before).toBeInstanceOf(Function);
const app = {
get: jest.fn(),
use: jest.fn()
};
const compilerStatsData = {
stats: [
{
compilation: {
fileDependencies: new Set([
'path/to/module.js',
'path/to/query.graphql',
'path/to/otherModule.js',graphql-playground-middleware-express
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