Include locator in error message when element is not found

[liefke]

Let's say I have the following code:

HtmlUnitDriver driver = ...
List<WebElement> elements = Stream.of(
    By.tagName("h1"), 
    By.tagName("h2"), 
    By.cssSelector("h3"), 
    By.cssSelector("h4")
  ).map(driver::findElement).toList();
...

When one of that elements is missing, I get different error messages:

• org.openqa.selenium.NoSuchElementException: Unable to locate element with name: 'h1'
• org.openqa.selenium.NoSuchElementException: Unable to locate element with name: 'h2'
• org.openqa.selenium.NoSuchElementException: Returned node (null) was not a DOM element
• org.openqa.selenium.NoSuchElementException: Returned node (null) was not a DOM element

I hope you see what the problem is: While I can identify what is missing from the error message for By.tagName, I can't do that from the error message for By.cssSelector, what makes it hard to find the root cause for an error.

So I'd like to ask if we can include the specific locator in each error message of HtmlUnitDriver.findElement.