noCredentialsTest.cs

@Test
public void noCredentialsTest() {
        WebElement _loginButton = driver.findElement(By.id("login-button"));
        _loginButton.click();
        WebElement _errorMessage = driver.findElement(By.xpath("//h3[@data-test='error']"));
        // Validate that the message is displayed:
        Assert.assertTrue(_errorMessage.isDisplayed());
        // Validate the message contains the correct text:
        Assert.assertTrue(_errorMessage.getText().equals("Epic sadface: Username is required"));
}