SAP Testing - Screen Flow

Screen flow logic in SAP Testing is like an ABAP code and it is used to contain the processing blocks. It contains the procedural part of the screen. It is created in screen painter and this screen painter is similar to an ABAP editor.

Screen flow logic involves no external data declaration and each processing block is defined with a prefix ‘PROCESS’. For example,

PROCESS AFTER INPUT
PROCESS BEFORE OUTPUT
PROCESS ON HELP-REQUEST
PROCESS ON VALUE-REQUEST

Each screen flow logic should contain PROCESS AFTER INPUT and PROCESS BEFORE OUTPUT keywords.

In an event block, you can use keywords like MODULE, FIELD, ON, VALUES, CALL, etc.

S.No.	Screen Flow Logic Keyword & Description
1	MODULE Calls a dialog module in an ABAP program
2	FIELD Specifies the point at which the contents of a screen field should be transported
3	ON Used in conjuction with FIELD
4	VALUES Used in conjunction with FIELD
5	CHAIN Starts a processing chain.
6	ENDCHAIN Ends a processing chain.
7	CALL Calls a subscreen.
8	LOOP Starts processing a screen table.
9	ENDLOOP Ends processing a screen table.

Creating Screen Flow

In the Repository browser, double-click on the name of a screen and it will display the flow logic of the screen.

The Flow Logic Editor of the Screen Painter will open and you edit the screen flow logic. You can use any of the available ABAP source code editors to define the flow logic.

You can use the following keywords to create the screen flow logic −

S.No.	keywords & Description
1	CALL Calls a subscreen.
2	CHAIN Starts a processing chain.
3	ENDCHAIN Ends a processing chain.
4	ENDLOOP Ends loop processing.
5	FIELD Refers to a field. Can be combined with the keywords MODULE and SELECT.
6	LOOP Starts loop processing.
7	MODIFY Modifies a table.
8	MODULE Identifies a processing module.
9	ON Used with FIELD assignments.
10	PROCESS Defines a processing event.
11	SELECT Checks an entry in a table.

Testing Screens

Testing screens are used to test the appearance of a screen as it will appear at runtime. If you have already programmed the flow logic, you can choose whether to simulate the screen with or without it.

To perform Screen test, follow the steps given below −

Select Screen → Test.
The system will display a dialog box for the runtime simulation.
You can change the window coordinates, if it is required.
Next, define the scope of simulation.
To include the flow logic, click 'choose complete flow logic'.
Click Continue and the screen simulation will appear.