jasmine/spec/core/GlobalErrorsSpec.js

describe('GlobalErrors', function() {
  it('calls the added handler on error', function() {
    var fakeGlobal = { onerror: null },
      handler = jasmine.createSpy('errorHandler'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

    errors.install();
    errors.pushListener(handler);

    fakeGlobal.onerror('foo');

    expect(handler).toHaveBeenCalledWith('foo');
  });

  it('only calls the most recent handler', function() {
    var fakeGlobal = { onerror: null },
      handler1 = jasmine.createSpy('errorHandler1'),
      handler2 = jasmine.createSpy('errorHandler2'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

    errors.install();
    errors.pushListener(handler1);
    errors.pushListener(handler2);

    fakeGlobal.onerror('foo');

    expect(handler1).not.toHaveBeenCalled();
    expect(handler2).toHaveBeenCalledWith('foo');
  });

  it('calls previous handlers when one is removed', function() {
    var fakeGlobal = { onerror: null },
      handler1 = jasmine.createSpy('errorHandler1'),
      handler2 = jasmine.createSpy('errorHandler2'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

    errors.install();
    errors.pushListener(handler1);
    errors.pushListener(handler2);

    errors.popListener();

    fakeGlobal.onerror('foo');

    expect(handler1).toHaveBeenCalledWith('foo');
    expect(handler2).not.toHaveBeenCalled();
  });

  it('uninstalls itself, putting back a previous callback', function() {
    var originalCallback = jasmine.createSpy('error'),
      fakeGlobal = { onerror: originalCallback },
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

    expect(fakeGlobal.onerror).toBe(originalCallback);

    errors.install();

    expect(fakeGlobal.onerror).not.toBe(originalCallback);

    errors.uninstall();

    expect(fakeGlobal.onerror).toBe(originalCallback);
  });

  it('rethrows the original error when there is no handler', function() {
    var fakeGlobal = {},
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal),
      originalError = new Error('nope');

    errors.install();

    try {
      fakeGlobal.onerror(originalError);
    } catch (e) {
      expect(e).toBe(originalError);
    }

    errors.uninstall();
  });

  it('reports uncaughtException in node.js', function() {
    var fakeGlobal = {
        process: {
          on: jasmine.createSpy('process.on'),
          removeListener: jasmine.createSpy('process.removeListener'),
          listeners: jasmine
            .createSpy('process.listeners')
            .and.returnValue(['foo']),
          removeAllListeners: jasmine.createSpy('process.removeAllListeners')
        }
      },
      handler = jasmine.createSpy('errorHandler'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

    errors.install();
    expect(fakeGlobal.process.on).toHaveBeenCalledWith(
      'uncaughtException',
      jasmine.any(Function)
    );
    expect(fakeGlobal.process.listeners).toHaveBeenCalledWith(
      'uncaughtException'
    );
    expect(fakeGlobal.process.removeAllListeners).toHaveBeenCalledWith(
      'uncaughtException'
    );

    errors.pushListener(handler);

    var addedListener = fakeGlobal.process.on.calls.argsFor(0)[1];
    addedListener(new Error('bar'));

    expect(handler).toHaveBeenCalledWith(new Error('bar'));
    expect(handler.calls.argsFor(0)[0].jasmineMessage).toBe(
      'Uncaught exception: Error: bar'
    );

    errors.uninstall();

    expect(fakeGlobal.process.removeListener).toHaveBeenCalledWith(
      'uncaughtException',
      addedListener
    );
    expect(fakeGlobal.process.on).toHaveBeenCalledWith(
      'uncaughtException',
      'foo'
    );
  });

  it('reports unhandledRejection in node.js', function() {
    var fakeGlobal = {
        process: {
          on: jasmine.createSpy('process.on'),
          removeListener: jasmine.createSpy('process.removeListener'),
          listeners: jasmine
            .createSpy('process.listeners')
            .and.returnValue(['foo']),
          removeAllListeners: jasmine.createSpy('process.removeAllListeners')
        }
      },
      handler = jasmine.createSpy('errorHandler'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

    errors.install();
    expect(fakeGlobal.process.on).toHaveBeenCalledWith(
      'unhandledRejection',
      jasmine.any(Function)
    );
    expect(fakeGlobal.process.listeners).toHaveBeenCalledWith(
      'unhandledRejection'
    );
    expect(fakeGlobal.process.removeAllListeners).toHaveBeenCalledWith(
      'unhandledRejection'
    );

    errors.pushListener(handler);

    var addedListener = fakeGlobal.process.on.calls.argsFor(1)[1];
    addedListener(new Error('bar'));

    expect(handler).toHaveBeenCalledWith(new Error('bar'));
    expect(handler.calls.argsFor(0)[0].jasmineMessage).toBe(
      'Unhandled promise rejection: Error: bar'
    );

    errors.uninstall();

    expect(fakeGlobal.process.removeListener).toHaveBeenCalledWith(
      'unhandledRejection',
      addedListener
    );
    expect(fakeGlobal.process.on).toHaveBeenCalledWith(
      'unhandledRejection',
      'foo'
    );
  });
});