Tests UISourceCode display name.

UISourceCode display name for url "http://localhost:8080/folder/filename?parameter=value&nnn=1" is "filename?parameter=value&nnn=1".
UISourceCode display name for url "http://localhost:8080/folder/very-long-filename-123456?nn=1" is "very-long-filename-123456?nn=1".
UISourceCode display name for url "http://localhost:8080/folder/too-long-filename-1234567890?nn=1" is "too-long-fil…e-1234567890?nn=1".
UISourceCode display name for url "http://localhost:8080/folder/long-filename?parameter=value&nnn=1" is "long-filename?parameter=value…".
UISourceCode display name for url "http://localhost:8080/folder/too-long-filename-1234567890?parameter=value&nnn=1" is "too-long-fil…e-1234567890?par…".