Sanitize nb output for testing

pysr/test/nb_sanitize.cfg

@@ -0,0 +1,3 @@
+[pathnames]
+regex: ^[a-zA-Z0-9_\-/]+/pysr/sr\.py
+replace: PATH

pysr/test/test_nb.ipynb

@@ -7,7 +7,6 @@
    "outputs": [],
    "source": [
     "# NBVAL_IGNORE_OUTPUT\n",
-    "import warnings\n",
     "import numpy as np\n",
     "from pysr import PySRRegressor, jl"
    ]

pysr/test/test_startup.py

@@ -135,6 +135,8 @@ class TestStartup(unittest.TestCase):
                 "pytest",
                 "--nbval",
                 str(Path(__file__).parent / "test_nb.ipynb"),
+                "--nbval-sanitize-with",
+                str(Path(__file__).parent / "nb_sanitize.cfg"),
             ],
             env=os.environ,
         )