Add '-list-tests' cmdline option

[akmal-threepointsix]

• I added new command line option -list-tests.
• It prints all tests from app->TestsAll in the following format:

Test: 'category' 'name'

• In command line you must run imgui_test_suite.exe -list-tests and the output looks the following way:

What you might not like:

• I included imgui_te_internal.h header, which presumably should not be included anywhere (because it is internal)
• I added early return on line 559, which is sometimes considered as antipattern

Why I opened this PR?

• Idk, to be honest, it is not an important change.
• It allows developers to print all test cases in command line, so if they just want to look at what tests were written for test_imgui_suite app, they won't have to run the whole app UI and ImGUI Test Engine UI.
• Also, it is kind of an example for developers on how they can print ImGUI Test Engine tests in their own applications.
• Finally, outputs in command line can be piped, e.g. you could save a list of tests to txt file by executing imgui_test_engine.exe -list-tests > text.txt

[akmal-threepointsix]

Btw, I am coming from The Open-Smartwatch project (https://github.com/Open-Smartwatch/open-smartwatch-os).

We use ImGUI in our emulator, so we wrote our UI tests using ImGUI Test Engine. The code is quite ugly, but demo videos look cool:

• Here you can find demo videos of ImGUI Test Engine tests in our project: Testing/integration tests Open-Smartwatch/open-smartwatch-os#351
• Here you can find the code, if you are interested to look at it (not recommended xD): Testing/integration tests Open-Smartwatch/open-smartwatch-os#367

[ocornut]

Hello,

Thanks for this. I have merged your commit as 1605937 then amended it with 4ab8e39.
Renamed the option to "-list", made it support filters (e.g. -list "^table") and exposed test list and test queue.

Great to see the test engine useful for your project!