CommunitySolidServer/test/unit/storage/routing/ConvertingRouterRule.test.ts

import type { Readable } from 'stream';
import type { Representation } from '../../../../src/ldp/representation/Representation';
import { RepresentationMetadata } from '../../../../src/ldp/representation/RepresentationMetadata';
import type { ResourceStore } from '../../../../src/storage/ResourceStore';
import { ConvertingRouterRule } from '../../../../src/storage/routing/ConvertingRouterRule';
import type { PreferenceSupport } from '../../../../src/storage/routing/PreferenceSupport';
import { InternalServerError } from '../../../../src/util/errors/InternalServerError';
import { NotFoundHttpError } from '../../../../src/util/errors/NotFoundHttpError';

describe('A ConvertingRouterRule', (): void => {
  let store1: ResourceStore;
  let store2: ResourceStore;
  let defaultStore: ResourceStore;
  let checker1: PreferenceSupport;
  let checker2: PreferenceSupport;
  let rule: ConvertingRouterRule;
  let representation: Representation;
  let metadata: RepresentationMetadata;

  beforeEach(async(): Promise<void> => {
    store1 = { name: 'turtleStore' } as any;
    store2 = { name: 'textStore' } as any;
    defaultStore = { name: 'defaultStore' } as any;

    checker1 = {
      async supports(input: { representation: Representation }): Promise<boolean> {
        return input.representation.metadata.contentType === 'text/turtle';
      },
    } as any;
    checker2 = {
      async supports(input: { representation: Representation }): Promise<boolean> {
        return input.representation.metadata.contentType === 'application/ld+json';
      },
    } as any;

    rule = new ConvertingRouterRule([{ store: store1, supportChecker: checker1 },
      { store: store2, supportChecker: checker2 }], defaultStore);

    metadata = new RepresentationMetadata();
    representation = { binary: true, data: 'data!' as any, metadata };
  });

  it('returns the corresponding store if it supports the input.', async(): Promise<void> => {
    metadata.contentType = 'text/turtle';
    await expect(rule.handle({ identifier: { path: 'identifier' }, representation })).resolves.toBe(store1);

    metadata.contentType = 'application/ld+json';
    await expect(rule.handle({ identifier: { path: 'identifier' }, representation })).resolves.toBe(store2);
  });

  it('returns the defaultStore if the converter does not support the input.', async(): Promise<void> => {
    await expect(rule.handle({ identifier: { path: 'identifier' }, representation })).resolves.toBe(defaultStore);
  });

  it('checks if the stores contain the identifier if there is no data.', async(): Promise<void> => {
    const data: Readable = { destroy: jest.fn() } as any;
    store1.getRepresentation = (): any => {
      throw new NotFoundHttpError();
    };
    store2.getRepresentation = async(): Promise<Representation> => ({ data } as any);
    await expect(rule.handle({ identifier: { path: 'identifier' }})).resolves.toBe(store2);
    expect(data.destroy).toHaveBeenCalledTimes(1);
  });

  it('returns the defaultStore if no other store has the resource.', async(): Promise<void> => {
    store1.getRepresentation = (): any => {
      throw new NotFoundHttpError();
    };
    store2.getRepresentation = (): any => {
      throw new NotFoundHttpError();
    };
    await expect(rule.handle({ identifier: { path: 'identifier' }})).resolves.toBe(defaultStore);
  });

  it('throws the error if a store had a non-404 error.', async(): Promise<void> => {
    store1.getRepresentation = (): any => {
      throw new InternalServerError();
    };
    await expect(rule.handle({ identifier: { path: 'identifier' }})).rejects.toThrow(InternalServerError);
  });
});