Add C++ test to obs-studio-server

[sandboxcoder]

Description

• This pull request depends on another pull request. After that PR is merged, we can merge this one.
• Add support for Catch2 testing framework C++ obs-studio-server tests
• Turn obs-studio-server into static lib
• Add null check on g_server in obs-studio-server/source/nodeobs_api.cpp since we do not need ipc server running during these tests
• Fix undefined behavior in UtilObjCInt constructor by explicitly initializing state to EState::Idle and worker to nullptr

Motivation and Context

There are some tests that we can run much more easily from C++. We can get better code coverage from these tests in certain cases.

How Has This Been Tested?

Verified this test passes when run locally in Xcode.

Types of changes

• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Code cleanup (non-breaking change which makes code smaller or more readable)

Checklist:

• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[Copilot]

Pull request overview

Adds a Catch2-based C++ unit-test executable for obs-studio-server and restructures the server build so the core code can be linked into tests (and the main server executable) via a new static library.

Changes:

• Introduces new Catch2 test(s) for osn::Source concurrency behavior plus OBS init/teardown helpers.
• Refactors obs-studio-server CMake to build a obs-studio-server-lib static library and link both the server executable and unit tests against it.
• Updates CI unit-test runner to execute both client and server Catch2 test suites.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
obs-studio-server/tests/test-osn-source.cpp	Adds a Catch2 test exercising concurrent GetProperties / Release on browser sources.
obs-studio-server/tests/test-helper.hpp	Declares a small helper for initializing/finalizing OBS for tests.
obs-studio-server/tests/test-helper.cpp	Implements OBS initialization/teardown and runtime parsing of test working directory.
obs-studio-server/source/nodeobs_api.cpp	Guards crash-manager server callback registration behind a g_server null check.
obs-studio-server/CMakeLists.txt	Builds server core as a static lib and adds a Catch2 unit-test executable with test discovery.
ci/run-unit-tests.js	Runs both obs-studio-client and obs-studio-server CTest-discovered Catch2 suites in CI.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

[CLAassistant]

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✅ sandboxcoder
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[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.