How to use the power-assert.notEqual function in power-assert

.then(request => {
            assert.equal(streamHelper.streamCount, 2);
            assert.notEqual(oldRequestStream, streamHelper.writeStream);
            assert.deepStrictEqual(collQueryJSON(), request);

            watchHelper.sendAddTarget();
            watchHelper.sendCurrent();
            watchHelper.sendSnapshot(3);
            return watchHelper.await('snapshot');
          })
          .then(results => {

it('should call onDrag when dragging', () => {
    const onDrag = sinon.spy();
    const resizeAndMovable = ReactDOM.render(
      ,
      document.querySelector('body > div')
    );
    const node = ReactDOM.findDOMNode(resizeAndMovable);
    TestUtils.Simulate.mouseDown(node, { clientX: 0, clientY: 0 });
    mouseMove(100, 120);
    mouseUp(100, 120);
    const style = node.getAttribute('style');
    assert.equal(onDrag.callCount, 1);
    assert.equal(onDrag.getCall(0).args[1].position.left, 100);
    assert.equal(onDrag.getCall(0).args[1].position.top, 120);
    assert.notEqual(style.indexOf('transform: translate(100px, 120px);'), -1);
  });

moxios.wait(() => {
                    let response = onFulfilled.getCall(0).args[0];
                    equal(response.status, 204);
                    let request = moxios.requests.get('PUT', '/users/12345');
                    notEqual(request, undefined);
                    done();
                });
            });

it('should install', () => {
        let defaultAdapter = axios.defaults.adapter;
        moxios.install();
        notEqual(axios.defaults.adapter, defaultAdapter);
        moxios.uninstall();
    });

moxios.wait(() => {
                    equal(onFulfilled.calledTwice, true);

                    let response1 = onFulfilled.getCall(0).args[0];
                    let response2 = onFulfilled.getCall(1).args[0];
                    equal(response1.status, 204);
                    equal(response2.status, 200);
                    equal(response2.data.firstName, 'Fred');

                    let request = moxios.requests.get('PUT', '/users/12345');
                    notEqual(request, undefined);

                    request = moxios.requests.get('GET', '/users/12346');
                    notEqual(request, undefined);

                    done();
                });
            });

it('should be rendered as div default', () => {
    const component = TestUtils.renderIntoDocument();
    const node = TestUtils.findRenderedDOMComponentWithTag(component, 'div');

    assert.notEqual(node, null);
  });

it('should be disposed after unmount', () => {
    const component = ReactDOM.render(, div);

    assert.notEqual(component.observer, null);

    ReactDOM.unmountComponentAtNode(div);

    assert.equal(component.observer, null);
  });
});