I finished writing the program for this exercise, but how do I write a Junit test for it?

This program requires a user input, which so far I can only test by using the test method - System.out.print("Expected:");

What I'm confused is that how are going to use the scanner when we make the rectangle class when, highly likely in the the JUnit test, we can just simply pass a parameter to initialize the length and width when we're using the JUnit test?

What I meant to ask is that how are we going to establish a constructor in the Rectangle class when, from my perception, we can initialize a length and a width inside the constructor by using the scanner. What's confusing me is how are we going to create a Rectangle object in our JUnit test, based on the type of constructor we make in the Rectangle class?

So I see the example you provided. The question I have is do you ask the user for input in the Rectangle class, the JUnit test, or both? What I tried doing was initialize the instance variables of the Rectangle class(the constructor I made had no parameters) by asking the user for input. However, when I did the JUnit test and constructed a Rectangle object and tested for the area, the Java virtual machine would be working but nothing was displaying.

rabbott wrote:

You can also call the Scanner from the JUnit test.  For example:

    @Test
    public void testGetArea( ) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Rectangle height > ");
        int height = scanner.nextInt();
        System.out.print("Rectangle width > ");
        int width = scanner.nextInt();
        // Assume the following is a valid Rectangle constructor
        Rectangle rect = new Rectangle(height, width);
        System.out.print("Expected area > ");
        int expectedArea = scanner.nextInt();
        assertEquals(expectedArea, rect.getArea());
    }

There seems to be a glitch in the relationship between JUnit tests and the Terminal. If you run the preceding test, the terminal window might not show up. To make the terminal window visible, select Show Terminal from the View menu. A shortcut is simply to enter control-t.

I apologize for the all caps. When I clicked on "reply with quote" and clicked "submit", that type of font came out. I tried editing multiple times but I didn't know how to get the font to the normal font. I apologize for that.