Travis CI: Test project exporting/script running in the headless editor

[Calinou]

This makes sure regressions in the editor CLI functionality are caught early on.

Suggestions for making the test process cleaner or more complete are welcome 🙂

See #17408.

[akien-mga]

I wouldn't include test projects in this repo, they should be in a dedicated Git repo which can be cloned during CI.

[Calinou]

@akien-mga Should we create a dedicated repository with the test project? We could reuse godot-tests, but then, we'd be cloning some data we don't use. (It's not that large right now, so it might not be an issue after all.)

[akien-mga]

I think we can reuse godot-tests for now.

[akien-mga]

Thanks!

[bruvzg]

There's something wrong with return values, seems like it's returning 0 for failed jobs with TEST_PROJECT disabled.

For example, I have rebased PR, it gone badly and build failed for all platforms, but Travis registered all except "Linux headless editor" as passed.

Build log: https://travis-ci.org/godotengine/godot/builds/576809375

4 errors generated.

scons: *** [editor/project_manager.osx.tools.64.o] Error 1

scons: building terminated because of errors.

The command "if [ "$STATIC_CHECKS" = "yes" ]; then sh ./misc/travis/clang-format.sh; else scons -j2 CC=$CC CXX=$CXX platform=$PLATFORM tools=$TOOLS target=$TARGET $OPTIONS $EXTRA_ARGS;

if [ "$TEST_PROJECT" = "yes" ]; then git clone --depth 1 "https://github.com/godotengine/godot-tests.git"; sed -i "s:custom_template/release=\"\":custom_template/release=\"$(readlink -e bin/godot_server.x11.opt.tools.64)\":" godot-tests/tests/project_export/export_presets.cfg; godot-tests/tests/project_export/test_project.sh "bin/godot_server.x11.opt.tools.64"; fi fi" exited with 0.

...

Done. Your build exited with 0.

[akien-mga]

@bruvzg Should be fixed by #31714.