typed-utilities/src/__tests__/sequenceId.test.ts

Strongly typed general purpose utilities

import { nextify, range, sequenceIdFn, sequenceIdGenerator } from "..";

describe(`sequenceId`, () => {
  describe(`sequenceIdGenerator`, () => {
    test(`unbounded`, () => {
      const seq = nextify(sequenceIdGenerator(`test`));
      const ids = range(10).map(() => seq());
      expect(ids).toEqual([
        `test-0`,
        `test-1`,
        `test-2`,
        `test-3`,
        `test-4`,
        `test-5`,
        `test-6`,
        `test-7`,
        `test-8`,
        `test-9`,
      ]);
    });

    test(`bounded`, () => {
      const seq = nextify(sequenceIdGenerator(`test`, 5));
      const ids = range(5).map(() => seq());
      expect(ids).toEqual([`test-0`, `test-1`, `test-2`, `test-3`, `test-4`]);
      expect(() => seq()).toThrow();
    });
  });

  describe(`sequenceIdFn`, () => {
    test(`unbounded`, () => {
      const seq = sequenceIdFn(`test`);
      const ids = range(10).map(() => seq());
      expect(ids).toEqual([
        `test-0`,
        `test-1`,
        `test-2`,
        `test-3`,
        `test-4`,
        `test-5`,
        `test-6`,
        `test-7`,
        `test-8`,
        `test-9`,
      ]);
    });

    test(`bounded`, () => {
      const seq = sequenceIdFn(`test`, 5);
      const ids = range(5).map(() => seq());
      expect(ids).toEqual([`test-0`, `test-1`, `test-2`, `test-3`, `test-4`]);
      expect(() => seq()).toThrow();
    });
  });
});