How to use the apollo-link-context.setContext.mock function in apollo-link-context
To help you get started, we’ve selected a few apollo-link-context examples, based on popular ways it is used in public projects.
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Jordaneisenburger / fallback-studio / src / pwa-studio / packages / venia-concept / src / __tests__ / index.spec.js View on Github 
jest.isolateModules(() => {
// Execute index.js.
require('../');
// Assert.
expect(setContext).toHaveBeenCalled();
const contextCallback = setContext.mock.calls[0][0];
expect(
contextCallback(null, { headers: { foo: 'bar' } })
).toMatchObject({
headers: {
foo: 'bar',
authorization: ''
}
});
// It includes the authorization header if the signin_token is present.
getItem.mockReturnValueOnce('blarg');
expect(contextCallback(null, { headers: {} })).toMatchObject({
headers: {
authorization: 'Bearer blarg'
}
});apollo-link-context
An easy way to set and cache context changes for Apollo Link
