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Authors: Arto Hellas, Matti Luukkainen
Translators to English: Emilia Hjelm, Alex H. Virtanen, Matti Luukkainen, Virpi Sumu, Birunthan Mohanathas, Etiënne Goossens
Extra material added by: Etiënne Goossens, Maurice Snoeren, Johan Talboom
The course is maintained by Technische Informatica Breda
Testing a program manually is a hopeless burden. It is possible to automate inputs by setting up a string as a Scanner
object parameter. The example below shows how it is possible to test automatically the program above.
String input = "translate\n" + "monkey\n" +
"translate\n" + "cheese\n" +
"add\n" + "cheese\n" + "juusto\n" +
"translate\n" + "cheese\n" +
"quit\n";
Scanner reader = new Scanner(input);
Dictionary dictionary = new Dictionary();
TextUserInterface ui = new TextUserInterface(reader, dictionary);
ui.start();
The print output contains only the program output, and not the user commands.
Commands:
add - adds a word couple to the dictionary
translate - asks for a word and prints its translation
quit - stops the user interface
Command: Give word: Unknown word!
Command: Give word: Unknown word!
Command: In Finnish: Translation:
Command: Give word: Translation: juusto
Command: Cheers!
Giving a string to a Scanner
class is a way to replace the String
inputs given through the keyboard. The contents of the String
variable input “simulates” the user input. \n
denotes a line break. Each single part of the input
variable which ends with a line break corresponds to one nextLine()
input.
It is easy to change the text input, and we can add new words to our dictionary in the following way:
String input = "add\n" + "cheese\n" + "juusto\n" +
"add\n" + "bier\n" + "olut\n" +
"add\n" + "book\n" + "kirja\n" +
"add\n" + "computer\n" + "tietokone\n" +
"add\n" + "auto\n" + "car\n" +
"quit\n";
If you want to test again your program manually, change the Scanner
object constructor parameter into System.in
, i.e system input stream.
The program functionality must be checked from the output pane, still. The result can still be confusing at the beginning, because the automatic input does not appear in the output pane at all.
The final goal will be to also automate the testing the program’s functionality, so that both testing the program and analising its output text would happen successfully in one click.