# Test

During the development of your apps, you go through several iterations of designing and testing with clients.

To facilitate easy testing and debugging of your application, you utilize the Windows client or Web client in diagnostic mode. This diagnostic mode serves as an analysis tool for your application, allowing users to execute applications, navigate through them, and access real-time information related to variables, inputs, and tasks. This feature greatly aids in identifying and resolving errors and issues.

The client will pause at any step requiring user action, such as a user step. To halt the workflow at other elements, simply add a breakpoint by selecting the element, right-clicking, and choosing 'Add Breakpoint' (F9). These breakpoints can be removed using the same procedure. Additionally, it is possible to eliminate all breakpoints by right-clicking in the design area and selecting 'Delete All Breakpoints'.

### How to use the diagnostic mode

To initiate the diagnostic mode, begin by selecting the play button (F12) located on the toolbar in the top right corner. 

Upon selection, the application will be automatically saved and launched into diagnostic mode within the Windows client. 

Alternatively, if you prefer to use the Web client, hold down the shift key and click on the play button.

Read more about testing in Diagnostic mode [here](/flow-connect/reference/reference/diagnostic-mode.md).

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