test.bat

@echo off

setlocal EnableDelayedExpansion

set BL_PATHS_FILE=blender_paths.txt

rem Checks, if there is a "blender_paths.txt"
if not exist "%BL_PATHS_FILE%" (
  echo No %BL_PATHS_FILE% found. Example:
  echo %BL_PATHS_FILE%
  echo full/path/here/blender.exe
  echo full/path/to/another/version/here/blender.exe
  goto :EOF
)

rem Counts up the lines inside "blender_paths.txt", that contain blender paths
set /a NUM_BL_PATHS=0
for /f "tokens=* usebackq" %%i in ("%BL_PATHS_FILE%") do (
  set /a NUM_BL_PATHS+=1
  set BL_PATH_!NUM_BL_PATHS!=%%i
)

rem If no blender paths were found, the "blender_paths.txt" is empty
if "%NUM_BL_PATHS%" == "0" (
  echo No blender paths found in %BL_PATHS_FILE%
  goto :EOF
)

echo On which Blender version would you like to run tests?

rem Sets the default selected Blender version to the first one in the list
set /a SELECTED_BL_PATH=1

:LOOP
  for /l %%i in (1,1,%NUM_BL_PATHS%) do (
    if "%%i"=="%SELECTED_BL_PATH%" (
      echo [x] !BL_PATH_%%i!
    ) else (
      echo [ ] !BL_PATH_%%i!
    )
  )

  rem goto multi-line-comment
  rem :multi-line-comment
  rem Prompts the user to choose a Blender version by displaying a list of options and waiting for the user to input a character corresponding to the desired option. The /c option specifies the list of valid characters, /n indicates that no prompt message should be displayed, /m specifies the prompt message, /t specifies the timeout in seconds (10 in this case), and /d specifies the default choice if the user doesn't enter anything.
  
  choice /c 123456789abcdefghijklmnopqrstuvwxyz /n /m "Choose a Blender version [1-%NUM_BL_PATHS%, q to quit]: " /t 10 /d 1
  
  set KEY=%errorlevel%

  if "%KEY%" lss 11 (
    set /a SELECTED_BL_PATH=%KEY%
    goto :TEST
  ) else if "%KEY%" equ "27" (
    goto :EOF
  ) else (
    goto :LOOP
  )

:TEST
  rem Assigns the value of the variable BL_PATH_%SELECTED_BL_PATH% (which corresponds to the selected Blender version path) to the variable BL_PATH.
  set BL_PATH=!BL_PATH_%SELECTED_BL_PATH%!
  
  rem Checks if the file or directory specified by BL_PATH exists. 
  if not exist "!BL_PATH!" (
    echo Invalid path: !BL_PATH!
    goto :EOF
  )

  rem This checks if the pytest package is installed in the Python environment. If it isn't, the script installs it using pip install pytest. If the installation fails, the script prints an error message (Failed to install pytest.).
  echo Checking if pytest is installed...
  pip show pytest > nul
  if %errorlevel% neq 0 (
    echo Installing pytest...
    pip install pytest > nul 2>&1 || echo Failed to install pytest.
  ) else (
    echo pytest is already installed.
  )

  rem This checks if the pytest-blender package is installed in the Python environment. If it isn't, the script installs it using pip install pytest-blender --blender-executable "!BL_PATH!". The --blender-executable option specifies the path to the Blender executable to use for running the tests. If the installation fails, the script prints an error message (Failed to install pytest-blender.).
  echo Checking if pytest-blender is installed...
  pip show pytest-blender > nul
  if %errorlevel% neq 0 (
    echo Installing pytest-blender...
    pip install pytest-blender --blender-executable "!BL_PATH!" > nul 2>&1 || echo Failed to install pytest-blender.
  ) else (
    echo pytest-blender is already installed.
  )

  rem This determines the path to the Python interpreter that will be used to run the tests. It does this by running pytest-blender --blender-executable "!BL_PATH!" and capturing the output using a for loop. If the path to the interpreter can't be determined, the script prints an error message (Failed to determine location of the Python interpreter.) and exits the code block.
  echo Determining location of the Python interpreter...
  set PYTHON_EXE=
  for /f "tokens=*" %%i in ('pytest-blender --blender-executable "!BL_PATH!"') do set PYTHON_EXE=%%i

  if not defined PYTHON_EXE (
    echo Failed to determine location of the Python interpreter.
    goto :EOF
  )

  rem This checks if the test requirements (specified in test-requirements.txt) are already installed in the Python environment. If they aren't, the script installs them using pip install -r test-requirements.txt. If the installation fails, the script prints an error message (`Failed to install test requirements
  echo Checking if test requirements are already installed...
  "%PYTHON_EXE%" -m pip freeze | findstr /i /c:"pytest==" > nul
  if %errorlevel% neq 0 (
    echo Installing test requirements...
    "%PYTHON_EXE%" -m pip install -r test-requirements.txt > nul 2>&1 || echo Failed to install test requirements.
  ) else (
    echo Test requirements are already installed.
  )

  echo Running tests...

  rem This line executes the pytest command with the --blender-executable flag set to the selected Blender version path stored in the BL_PATH variable. It also specifies the directory where the tests are located using the tests argument. This command will run all the tests in the tests directory using the selected Blender version.
  pytest --blender-executable "!BL_PATH!" tests --verbose

pause
endlocal