1 files changed, 66 insertions, 0 deletions
diff --git a/tests/test_cuda_setup_evaluator.py b/tests/test_cuda_setup_evaluator.py
new file mode 100644
index 0000000..96ee6c5
--- /dev/null
+++ b/tests/test_cuda_setup_evaluator.py
@@ -0,0 +1,66 @@
+import pytest
+
+from typing import List
+
+from bitsandbytes.cuda_setup import (
+    CUDA_RUNTIME_LIB,
+    get_cuda_runtime_lib_path,
+    evaluate_cuda_setup,
+    tokenize_paths,
+)
+
+
+HAPPY_PATH__LD_LIB_TEST_PATHS: List[tuple[str,str]] = [
+    (f"some/other/dir:dir/with/{CUDA_RUNTIME_LIB}", f"dir/with/{CUDA_RUNTIME_LIB}"),
+    (f":some/other/dir:dir/with/{CUDA_RUNTIME_LIB}", f"dir/with/{CUDA_RUNTIME_LIB}"),
+    (f"some/other/dir:dir/with/{CUDA_RUNTIME_LIB}:", f"dir/with/{CUDA_RUNTIME_LIB}"),
+    (f"some/other/dir::dir/with/{CUDA_RUNTIME_LIB}", f"dir/with/{CUDA_RUNTIME_LIB}"),
+    (f"dir/with/{CUDA_RUNTIME_LIB}:some/other/dir", f"dir/with/{CUDA_RUNTIME_LIB}"),
+]
+
+
+@pytest.mark.parametrize(
+    "test_input, expected",
+    HAPPY_PATH__LD_LIB_TEST_PATHS
+)
+def test_get_cuda_runtime_lib_path__happy_path(
+        tmp_path, test_input: str, expected: str
+):
+    for path in tokenize_paths(test_input):
+        assert False == tmp_path / test_input
+        test_dir.mkdir()
+        (test_input / CUDA_RUNTIME_LIB).touch()
+    assert get_cuda_runtime_lib_path(test_input) == expected
+
+
+UNHAPPY_PATH__LD_LIB_TEST_PATHS = [
+    f"a/b/c/{CUDA_RUNTIME_LIB}:d/e/f/{CUDA_RUNTIME_LIB}",
+    f"a/b/c/{CUDA_RUNTIME_LIB}:d/e/f/{CUDA_RUNTIME_LIB}:g/h/j/{CUDA_RUNTIME_LIB}",
+]
+
+
+@pytest.mark.parametrize("test_input", UNHAPPY_PATH__LD_LIB_TEST_PATHS)
+def test_get_cuda_runtime_lib_path__unhappy_path(tmp_path, test_input: str):
+    test_input = tmp_path / test_input
+    (test_input / CUDA_RUNTIME_LIB).touch()
+    with pytest.raises(FileNotFoundError) as err_info:
+        get_cuda_runtime_lib_path(test_input)
+    assert all(
+        match in err_info 
+        for match in {"duplicate", CUDA_RUNTIME_LIB}
+    )
+
+
+def test_get_cuda_runtime_lib_path__non_existent_dir(capsys, tmp_path):
+    existent_dir = tmp_path / 'a/b'
+    existent_dir.mkdir()
+    non_existent_dir = tmp_path / 'c/d' # non-existent dir
+    test_input = ":".join([str(existent_dir), str(non_existent_dir)])
+
+    get_cuda_runtime_lib_path(test_input)
+    std_err = capsys.readouterr().err
+
+    assert all(
+        match in std_err 
+        for match in {"WARNING", "non-existent"}
+    )