I try to write JUnit tests in IntelliJ for an application, that modifies a String. Now how can I test one particular print on the console?
Let's assume the start-string is stored in args[0] as "Hello World" and we have a method that can change a single letter in the string. The string will be printed out after the execution of the method.
public class modifyString {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
while(true) {
// Print the string
System.out.println(args[0]);
// Wait for a userinput that only contains two chars,
// e.g. '0h' <- 'Change the index 0 to 'h''
// (the order of the chars is unimportant)
String input = scanner.nextLine();
if(preconditionFullfilled(input)) {
executeOperation(input, args);
}
}
}
}
For example: The expected output for the input '0h' with a 'Hello World' string in args[0] should be 'hello World'.
How do I write a JUnit test to test this particular result?
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