[py] Allow 0 coordinates for the window position. Fixes #9574

Python is treating 0 as falsy types if we just use the `not`
keyword. Being more explicit for that and added a few tests to
make sure that we don't ever allow it.

Author: AutomatedTester

py/selenium/webdriver/remote/webdriver.py

@@ -1368,7 +1368,7 @@ def set_window_rect(self, x=None, y=None, width=None, height=None) -> dict:
                 driver.set_window_rect(x=10, y=10, width=100, height=200)
         """
 
-        if (not x and not y) and (not height and not width):
+        if (x is None and y is None) and (not height and not width):
             raise InvalidArgumentException("x and y or height and width need values")
 
         return self.execute(Command.SET_WINDOW_RECT, {"x": x, "y": y,

py/test/selenium/webdriver/common/window_tests.py

@@ -114,6 +114,20 @@ def test_should_set_the_rect_of_the_current_window(driver):
     assert new_rect.get('height') == target_height
 
 
+def test_set_window_rect_should_accept_0_as_x_and_y(driver):
+    from selenium.common.exceptions import InvalidArgumentException
+    try:
+        driver.set_window_rect(x=0, y=0)
+    except InvalidArgumentException:
+        pytest.fail("Should not have thrown InvalidArgumentException")
+
+
+def test_set_window_rect_throws_when_height_and_width_are_0(driver):
+    from selenium.common.exceptions import InvalidArgumentException
+    with pytest.raises(InvalidArgumentException):
+        driver.set_window_rect(height=0, width=0)
+
+
 # @pytest.mark.xfail_safari(raises=WebDriverException,
 #                           reason='Fullscreen command not implemented')
 # @pytest.mark.skipif(os.environ.get('TRAVIS') == 'true',