Update chapter3-exercise-small-caps-tests.md

tests/chapter3-exercise-small-caps-tests.md

@@ -16,8 +16,7 @@ Testing boilerplate:
     >>> _ = wbemocks.ssl.patch().start()
     >>> _ = wbemocks.patch_canvas()
     >>> import browser
-    >>> browser.WIDTH
-    800
+    >>> browser.set_parameters(WIDTH=800)
     >>> def test_layout(text):
     ...   dl = browser.Layout(browser.lex(text)).display_list
     ...   return wbemocks.normalize_display_list(dl)