tests: models: find model script paths relative to psyneulink root (#…

…3141)

Searching for the model scripts starting from the test directory can
fail if psyneulink is not installed locally. Starting from the
psyneulink root directory should be more reliable across install types.

tests/models/test_documentation_models.py

@@ -1,5 +1,5 @@
 import json
-import os
+import pathlib
 import runpy
 import sys
 
@@ -80,23 +80,15 @@ def test_documentation_models(
     additional_args,
     variant,
 ):
-    models_dir = os.path.join(
-        os.path.dirname(__file__),
-        '..',
-        '..',
-        'psyneulink',
-        'library',
-        'models'
-    )
-    model_file = os.path.join(models_dir, f'{model_name}.py')
+    models_dir = pathlib.Path(pnl.__file__).parent.joinpath('library', 'models')
+    model_file = models_dir.joinpath(f'{model_name}.py')
     old_argv = sys.argv
     sys.argv = [model_file] + additional_args
     script_globals = runpy.run_path(model_file)
     sys.argv = old_argv
 
     suffix = f'-{variant}' if variant is not None else ''
-    expected_results_file = os.path.join(
-        models_dir,
+    expected_results_file = models_dir.joinpath(
         'results',
         f'{model_name}-{composition_name}{suffix}.json'
     )