Document Test Suites

[Lightning11wins]

Add Testing.md to centrallix-sysdoc to document the various test suites and testing methods in Centrallix, including where to find them, how to run them, and how to add additional tests.

Information may be missing or inaccurate, especially regarding the Selenium test suite that I still have never run on my own.

[greptile-apps]

Greptile Summary

This PR adds Testing.md to centrallix-sysdoc, documenting the test-obj, centrallix-lib, and Selenium UI test suites — covering how to find, run, and extend each suite. It also corrects an invalid C function signature in centrallix/tests/README (**char name → char** name). All remaining findings are P2.

Confidence Score: 5/5

Safe to merge — documentation-only PR with accurate content and a correct README fix.

Both findings are P2 (a one-word typo and an informal phrasing note). All cross-referenced files (UITestCoverage.md, centrallix-lib/tests/README) resolve correctly. The C signature fix addresses the previously raised P0 issue.

No files require special attention.

Important Files Changed

Filename	Overview
centrallix-sysdoc/Testing.md	New 185-line testing guide covering test-obj, centrallix-lib, and Selenium UI suites; minor typo on line 59 and informal voice on line 118
centrallix/tests/README	One-line fix correcting C function signature from **char name to char** name

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Developer runs tests] --> B{Which suite?}
    B --> C[test-obj suite]
    B --> D[centrallix-lib suite]
    B --> E[Selenium UI suite]
    C --> C1[make test in centrallix/]
    C1 --> C2[Standard .to / .cmp tests]
    C1 --> C3[Native C .c tests]
    D --> D1[make test in centrallix-lib/]
    D1 --> D2[C binaries via t_driver.c]
    D1 --> D3[Optional: make valtest / gcov]
    E --> E1[Start Centrallix server]
    E1 --> E2[python3 tests/X_test.py]
    E2 --> E3[Chrome via ChromeDriver]

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[Lightning11wins]

@greptileai I've resolved your comments, can you rereview? Remember, I'd like to make MINIMAL changes to that README file in centrallix/tests even though I now have changes there because it's outside the tight scope of this small documentation project.

[Lightning11wins]

Oops, forgot about the blocking issues in our questions thread. My bad.