session-desktop/libtextsecure/test/task_with_timeout_test.js

describe('createTaskWithTimeout', () => {
  it('resolves when promise resolves', () => {
    const task = function() {
      return Promise.resolve('hi!');
    };
    const taskWithTimeout = textsecure.createTaskWithTimeout(task);

    return taskWithTimeout().then(result => {
      assert.strictEqual(result, 'hi!');
    });
  });
  it('flows error from promise back', () => {
    const error = new Error('original');
    const task = function() {
      return Promise.reject(error);
    };
    const taskWithTimeout = textsecure.createTaskWithTimeout(task);

    return taskWithTimeout().catch(flowedError => {
      assert.strictEqual(error, flowedError);
    });
  });
  it('rejects if promise takes too long (this one logs error to console)', function() {
    const error = new Error('original');
    let complete = false;
    const task = function() {
      return new Promise(resolve => {
        setTimeout(() => {
          complete = true;
          resolve();
        }, 3000);
      });
    };
    const taskWithTimeout = textsecure.createTaskWithTimeout(task, this.name, {
      timeout: 10,
    });

    return taskWithTimeout().then(
      () => {
        throw new Error('it was not supposed to resolve!');
      },
      () => {
        assert.strictEqual(complete, false);
      }
    );
  });
  it('resolves if task returns something falsey', () => {
    const task = function() {};
    const taskWithTimeout = textsecure.createTaskWithTimeout(task);
    return taskWithTimeout();
  });
  it('resolves if task returns a non-promise', () => {
    const task = function() {
      return 'hi!';
    };
    const taskWithTimeout = textsecure.createTaskWithTimeout(task);
    return taskWithTimeout().then(result => {
      assert.strictEqual(result, 'hi!');
    });
  });
  it('rejects if task throws (and does not log about taking too long)', function() {
    const error = new Error('Task is throwing!');
    const task = function() {
      throw error;
    };
    const taskWithTimeout = textsecure.createTaskWithTimeout(task, this.name, {
      timeout: 10,
    });
    return taskWithTimeout().then(
      result => {
        throw new Error('Overall task should reject!');
      },
      flowedError => {
        assert.strictEqual(flowedError, error);
      }
    );
  });
});