Outline of the Unit Test
The things we want to test are:
- Initial settings:
- The text field is empty.
- The text field is a sensible size.
- The Ok button is disabled.
- The Cancel button is enabled.
- The dialog is a sensible size.
- Usability:
- The Escape key cancels the dialog.
- The Enter key activates the Ok button.
- The mnemonics for Ok and Cancel work.
.
- Correctness. The Ok button is disabled if the entered name:
- Contains characters such as '*', '\', '/'. ° Is just white-space.
- Is one already being used.
.
- API test: unit tests for each of the public methods.
As with most unit tests, our test class has an init() method for getting an object into a known state, and a cleanup() method called at the end of each test. The instance variables are:
- A JFrame and a set of IkonNames from which the SaveAsDialog can be constructed.
- A SaveAsDialog, which is the object under test.
- A UserStrings and a UISaveAsDialog (listed later on) for manipulating the SaveAsDialog with keystrokes.
- A ShowerThread, which is a Thread for showing the SaveAsDialog. This is listed later on.
The outline of the unit test is:
Sample Code
public class SaveAsDialogTest {
private JFrame frame
private SaveAsDialog sad
private IkonMakerUserStrings =
IkonMakerUserStrings.instance()
private SortedSet<ikonname></ikonname> names
private UISaveAsDialog ui
private Shower shower
...
private void init() {
...
}
private void cleanup() {
...
}
private class ShowerThread extends Thread {
...
}
}
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UI Helper Methods
A lot of the work in this unit test will be done by the static methods in our helper class, UI. We looked at some of these (isEnabled(), runInEventThread(), and findNamedComponent()) in Chapter 8. The new methods are listed now, according to their function.
Dialogs
If a dialog is showing, we can search for a dialog by name, get its size, and read its title:
Sample Code
public final class UI {
...
/**
* Safely read the showing state of the given window.
*/
public static boolean isShowing( final Window window ) {
final boolean[] resultHolder = new boolean[]{false}
runInEventThread( new Runnable() {
public void run() {
resultHolder[0] = window.isShowing()
}
} )
return resultHolder[0]
}
/**
* The first found dialog that has the given name and
* is showing (though the owning frame need not be showing).
*/
public static Dialog findNamedDialog( String name ) {
Frame[] allFrames = Frame.getFrames()
for (Frame allFrame : allFrames) {
Window[] subWindows = allFrame.getOwnedWindows()
for (Window subWindow : subWindows) {
if (subWindow instanceof Dialog) {
Dialog d = (Dialog) subWindow
if (name.equals( d.getName() )
&& d.isShowing()) {
return (Dialog) subWindow
}
}
}
}
return null
}
/**
* Safely read the size of the given component.
*/
public static Dimension getSize( final Component component ) {
final Dimension[] resultHolder = new Dimension[]{null}
runInEventThread( new Runnable() {
public void run() {
resultHolder[0] = component.getSize()
}
} )
return resultHolder[0]
}
/**
* Safely read the title of the given dialog.
*/
public static String getTitle( final Dialog dialog ) {
final String[] resultHolder = new String[]{null}
runInEventThread( new Runnable() {
public void run() {
resultHolder[0] = dialog.getTitle()
}
} )
return resultHolder[0]
} ...
}
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Tutorials 
