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('enables external interception of error by overriding global.onerror', function() {
    var fakeGlobal = { onerror: null },
      handler = jasmine.createSpy('errorHandler'),
      hijackHandler = jasmine.createSpy('hijackErrorHandler'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

    fakeGlobal.onerror = hijackHandler;

    fakeGlobal.onerror('foo');

    expect(hijackHandler).toHaveBeenCalledWith('foo');
    expect(handler).not.toHaveBeenCalled();
  });

  it('calls the global error handler with all parameters', function() {
    var fakeGlobal = { onerror: null },
      handler = jasmine.createSpy('errorHandler'),
      errors = new jasmineUnderTest.GlobalErrors(fakeGlobal),
      fooError = new Error('foo');

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

    fakeGlobal.onerror(fooError.message, 'foo.js', 1, 1, fooError);

    expect(handler).toHaveBeenCalledWith(
      fooError.message,
      'foo.js',
      1,
      1,
      fooError
    );
  });

  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(handler2);

    fakeGlobal.onerror('foo');

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

  it('throws when no listener is passed to #popListener', function() {
    var errors = new jasmineUnderTest.GlobalErrors({});
    expect(function() {
      errors.popListener();
    }).toThrowError('popListener expects a listener');
  });

  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 uncaught exceptions 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'
    );
  });

  describe('Reporting unhandled promise rejections in node.js', function() {
    it('reports rejections with `Error` reasons', 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'
      );
    });

    it('reports rejections with non-`Error` reasons', function() {
      var fakeGlobal = {
          process: {
            on: jasmine.createSpy('process.on'),
            removeListener: function() {},
            listeners: function() {
              return [];
            },
            removeAllListeners: function() {}
          }
        },
        handler = jasmine.createSpy('errorHandler'),
        errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

      expect(fakeGlobal.process.on.calls.argsFor(1)[0]).toEqual(
        'unhandledRejection'
      );
      var addedListener = fakeGlobal.process.on.calls.argsFor(1)[1];
      addedListener(17);

      expect(handler).toHaveBeenCalledWith(
        new Error(
          'Unhandled promise rejection: 17\n' +
            '(Tip: to get a useful stack trace, use ' +
            'Promise.reject(new Error(...)) instead of Promise.reject(...).)'
        )
      );
    });

    it('reports rejections with no reason provided', function() {
      var fakeGlobal = {
          process: {
            on: jasmine.createSpy('process.on'),
            removeListener: function() {},
            listeners: function() {
              return [];
            },
            removeAllListeners: function() {}
          }
        },
        handler = jasmine.createSpy('errorHandler'),
        errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

      expect(fakeGlobal.process.on.calls.argsFor(1)[0]).toEqual(
        'unhandledRejection'
      );
      var addedListener = fakeGlobal.process.on.calls.argsFor(1)[1];
      addedListener(undefined);

      expect(handler).toHaveBeenCalledWith(
        new Error(
          'Unhandled promise rejection with no error or message\n' +
            '(Tip: to get a useful stack trace, use ' +
            'Promise.reject(new Error(...)) instead of Promise.reject().)'
        )
      );
    });
  });

  describe('Reporting unhandled promise rejections in the browser', function() {
    it('subscribes and unsubscribes from the unhandledrejection event', function() {
      var fakeGlobal = jasmine.createSpyObj('globalErrors', [
          'addEventListener',
          'removeEventListener',
          'onerror'
        ]),
        errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

      errors.install();
      expect(fakeGlobal.addEventListener).toHaveBeenCalledWith(
        'unhandledrejection',
        jasmine.any(Function)
      );

      var addedListener = fakeGlobal.addEventListener.calls.argsFor(0)[1];
      errors.uninstall();

      expect(fakeGlobal.removeEventListener).toHaveBeenCalledWith(
        'unhandledrejection',
        addedListener
      );
    });

    it('reports rejections whose reason is a string', function() {
      var fakeGlobal = jasmine.createSpyObj('globalErrors', [
          'addEventListener',
          'removeEventListener',
          'onerror'
        ]),
        handler = jasmine.createSpy('errorHandler'),
        errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

      var addedListener = fakeGlobal.addEventListener.calls.argsFor(0)[1];
      addedListener({ reason: 'nope' });

      expect(handler).toHaveBeenCalledWith('Unhandled promise rejection: nope');
    });

    it('reports rejections whose reason is an Error', function() {
      var fakeGlobal = jasmine.createSpyObj('globalErrors', [
          'addEventListener',
          'removeEventListener',
          'onerror'
        ]),
        handler = jasmine.createSpy('errorHandler'),
        errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

      var addedListener = fakeGlobal.addEventListener.calls.argsFor(0)[1];
      var reason;

      try {
        // Throwing ensures that we get a stack property in all browsers
        throw new Error('bar');
      } catch (e) {
        reason = e;
      }

      addedListener({ reason: reason });

      expect(handler).toHaveBeenCalledWith(
        jasmine.objectContaining({
          jasmineMessage: 'Unhandled promise rejection: Error: bar',
          message: reason.message,
          stack: reason.stack
        })
      );
    });

    describe('Enabling external interception of reported rejections by overriding global.onerror', function() {
      it('overriding global.onerror intercepts rejections whose reason is a string', function() {
        var fakeGlobal = jasmine.createSpyObj('globalErrors', [
            'addEventListener'
          ]),
          handler = jasmine.createSpy('errorHandler'),
          hijackHandler = jasmine.createSpy('hijackErrorHandler'),
          errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

        fakeGlobal.onerror = hijackHandler;

        var addedListener = fakeGlobal.addEventListener.calls.argsFor(0)[1];
        addedListener({ reason: 'nope' });

        expect(hijackHandler).toHaveBeenCalledWith(
          'Unhandled promise rejection: nope'
        );
        expect(handler).not.toHaveBeenCalled();
      });

      it('overriding global.onerror intercepts rejections whose reason is an Error', function() {
        var fakeGlobal = jasmine.createSpyObj('globalErrors', [
            'addEventListener'
          ]),
          handler = jasmine.createSpy('errorHandler'),
          hijackHandler = jasmine.createSpy('hijackErrorHandler'),
          errors = new jasmineUnderTest.GlobalErrors(fakeGlobal);

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

        fakeGlobal.onerror = hijackHandler;

        var addedListener = fakeGlobal.addEventListener.calls.argsFor(0)[1];
        var reason;

        try {
          // Throwing ensures that we get a stack property in all browsers
          throw new Error('bar');
        } catch (e) {
          reason = e;
        }

        addedListener({ reason: reason });

        expect(hijackHandler).toHaveBeenCalledWith(
          jasmine.objectContaining({
            jasmineMessage: 'Unhandled promise rejection: Error: bar',
            message: reason.message,
            stack: reason.stack
          })
        );
        expect(handler).not.toHaveBeenCalled();
      });
    });
  });
});