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/* eslint-disable no-underscore-dangle */
import { gql, execute, ApolloLink, Observable } from '@apollo/client/core';
import { testApolloLink } from 'helpers/test_apollo_link';
import { getPersistLink } from '~/lib/apollo/persist_link';
const DEFAULT_QUERY = gql`
query {
foo {
bar
}
}
`;
const QUERY_WITH_DIRECTIVE = gql`
query {
foo @persist {
bar
}
}
`;
const QUERY_WITH_PERSIST_FIELD = gql`
query {
foo @persist {
bar
__persist
}
}
`;
const terminatingLink = new ApolloLink(() => Observable.of({ data: { foo: { bar: 1 } } }));
describe('~/lib/apollo/persist_link', () => {
let subscription;
afterEach(() => {
if (subscription) {
subscription.unsubscribe();
}
});
it('removes `@persist` directive from the operation', async () => {
const operation = await testApolloLink(getPersistLink(), {}, QUERY_WITH_DIRECTIVE);
const { selections } = operation.query.definitions[0].selectionSet;
expect(selections[0].directives).toEqual([]);
});
it('removes `__persist` fields from the operation with `@persist` directive', async () => {
const operation = await testApolloLink(getPersistLink(), {}, QUERY_WITH_PERSIST_FIELD);
const { selections } = operation.query.definitions[0].selectionSet;
const childFields = selections[0].selectionSet.selections;
expect(childFields).toHaveLength(1);
expect(childFields.some((field) => field.name.value === '__persist')).toBe(false);
});
it('decorates the response with `__persist: true` is there is `__persist` field in the query', async () => {
const link = getPersistLink().concat(terminatingLink);
subscription = execute(link, { query: QUERY_WITH_PERSIST_FIELD }).subscribe(({ data }) => {
expect(data.foo.__persist).toBe(true);
});
});
it('does not decorate the response with `__persist: true` is there if query is not persistent', async () => {
const link = getPersistLink().concat(terminatingLink);
subscription = execute(link, { query: DEFAULT_QUERY }).subscribe(({ data }) => {
expect(data.foo.__persist).toBe(undefined);
});
});
});
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