Update a raw selenium example

examples/migration/raw_selenium/ReadMe.md

@@ -29,7 +29,7 @@ By this stage, newcomers to Selenium have evolved into legitimate test automatio
 
 * [refined_raw.py](https://github.com/seleniumbase/SeleniumBase/tree/master/examples/migration/raw_selenium/refined_raw.py)
 
-By now, the test automation engineer has become an expert in breaking out code into reusable methods, and the test itself has been simplified down to a single page action per line. The code is easy to read and easy to maintain. The journey of writing a complete test automation framework for Selenium has begun.
+By now, the test automation engineer has become an expert in breaking out code into reusable methods, and the test itself has been simplified down to a single page action per line. The code is easy to read and easy to maintain. The error output is also simplified. The journey of writing a complete test automation framework for Selenium has begun.
 
 * [simple_sbase.py](https://github.com/seleniumbase/SeleniumBase/tree/master/examples/migration/raw_selenium/simple_sbase.py)
 

examples/migration/raw_selenium/refined_raw.py

@@ -34,23 +34,41 @@ class RefinedRawSelenium(TestCase):
     def wait_for_element_visible(
         self, selector, by="css selector", timeout=10
     ):
+        try:
             return WebDriverWait(self.driver, timeout).until(
                 EC.visibility_of_element_located((by, selector))
             )
+        except Exception:
+            raise Exception(
+                "Element {%s} was not visible after %s seconds!"
+                % (selector, timeout)
+            )
 
     def wait_for_element_clickable(
         self, selector, by="css selector", timeout=10
     ):
+        try:
             return WebDriverWait(self.driver, timeout).until(
                 EC.element_to_be_clickable((by, selector))
             )
+        except Exception:
+            raise Exception(
+                "Element {%s} was not visible/clickable after %s seconds!"
+                % (selector, timeout)
+            )
 
     def wait_for_element_not_visible(
         self, selector, by="css selector", timeout=10
     ):
+        try:
             return WebDriverWait(self.driver, timeout).until(
                 EC.invisibility_of_element((by, selector))
             )
+        except Exception:
+            raise Exception(
+                "Element {%s} was still visible after %s seconds!"
+                % (selector, timeout)
+            )
 
     def open(self, url):
         self.driver.get(url)