One of the arguments that can be added to the prerun capability in your test configuration options is --silent, which can be abbreviated to /S. This argument will "silently" install the executable without any modal dialogs or other installation processes showing up in your tests. Here's an example of how you would set the prerun capability to run in silent mode:
"prerun": {
"executable": "http://url.to/your/executable.exe",
"args": [ "/S", "-a", "-q" ],
"background": true,
"timeout": 120
}
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