Frames.cs

    @Test
    public void frames() {
        driver.navigate().to("https://the-internet.herokuapp.com/nested_frames");
        WebElement defaultFrame = driver.findElement(By.name("frame-top"));
        driver.switchTo().frame(1);
        Assert.assertEquals("BOTTOM", driver.findElement(By.tagName("body")).getText());
        
        driver.switchTo().parentFrame();
        driver.switchTo().frame("frame-top");
        driver.switchTo().frame("frame-left");
        Assert.assertEquals("LEFT", driver.findElement(By.tagName("body")).getText());
        
        driver.switchTo().defaultContent();
        Assert.assertTrue(driver.findElement(By.name("frame-top")).getSize().height>0);
    }