EnabledElements.cs

    @Test
    public void enabledElements() throws InterruptedException {
        driver.get("https://the-internet.herokuapp.com/dynamic_controls");
        WebElement textField = driver.findElement(By.xpath("//input[@type='text']"));
        Assert.assertTrue(!textField.isEnabled());
        driver.findElement(By.xpath("//button[@onclick='swapInput()']")).click();
        Thread.sleep(5000);
        Assert.assertTrue(textField.isEnabled());
    }