isograph/libs/isograph-react/src/tests/optimisticProxy.test.ts at 1b76c61d3c3379ac02f2480dc421d2558853782e · PatrykWalach/isograph · GitHub

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import { beforeEach, describe, expect, test, vi } from 'vitest';
import {
  createIsographEnvironment,
  type IsographStore,
} from '../core/IsographEnvironment';
import { mergeOptimisticLayer } from '../core/optimisticProxy';

describe('optimisticProxy', () => {
  let environment: ReturnType<typeof createIsographEnvironment>;

  beforeEach(() => {
    const store: IsographStore = {
      Query: {
        __ROOT: {},
      },
      Economist: {
        0: {
          __typename: 'Economist',
          id: '0',
          name: 'Jeremy Bentham',
        },
      },
    };
    const networkFunction = vi
      .fn()
      .mockRejectedValue(new Error('Fetch failed'));
    environment = createIsographEnvironment(store, networkFunction);
  });

  test('is equal to store', () => {
    expect(environment.optimisticStore.Economist?.[0]).toStrictEqual({
      __typename: 'Economist',
      id: '0',
      name: 'Jeremy Bentham',
    });
  });

  test('writes update proxy', () => {
    environment.optimisticStore.Economist![0]!.name = 'Updated Jeremy Bentham';

    expect(environment.optimisticStore.Economist![0]).toStrictEqual({
      __typename: 'Economist',
      id: '0',
      name: 'Updated Jeremy Bentham',
    });
  });

  test('writes update optimistic layer', () => {
    environment.optimisticStore.Economist![0]!.name = 'Updated Jeremy Bentham';

    expect(environment.optimisticLayer).toStrictEqual({
      Economist: {
        0: { name: 'Updated Jeremy Bentham' },
      },
    });
  });

  test('writes keep store intact', () => {
    environment.optimisticStore.Economist![0]!.name = 'Updated Jeremy Bentham';

    expect(environment.store.Economist?.[0]).toStrictEqual({
      __typename: 'Economist',
      id: '0',
      name: 'Jeremy Bentham',
    });
  });

  test('reads from optimistic layer if record is undefined', () => {
    environment.optimisticLayer.Economist = {
      1: {
        __typename: 'Economist',
        id: '1',
        name: 'John Stuart Mill',
      },
    };

    expect(environment.optimisticStore.Economist![1]).toStrictEqual({
      __typename: 'Economist',
      id: '1',
      name: 'John Stuart Mill',
    });
  });

  describe('mergeOptimisticLayer', () => {
    test('merges optimistic layer with store', () => {
      environment.optimisticStore.Economist![0]!.name =
        'Updated Jeremy Bentham';

      mergeOptimisticLayer(environment);
      expect(environment.optimisticLayer).toStrictEqual({});
      expect(environment.optimisticStore.Economist?.[0]).toStrictEqual({
        __typename: 'Economist',
        id: '0',
        name: 'Updated Jeremy Bentham',
      });
    });
  });
});