Fix type hint and adjust test

Author: filmor

clr_loader/util/find.py

@@ -105,7 +105,7 @@ def find_runtimes() -> Iterator[DotnetCoreRuntimeSpec]:
         return find_runtimes_in_root(dotnet_root)
 
 
-def find_libmono(*, assembly_dir: str = None, sgen: bool = True) -> Path:
+def find_libmono(*, assembly_dir: Optional[str] = None, sgen: bool = True) -> Path:
     """Find a suitable libmono dynamic library
 
     On Windows and macOS, we check the default installation directories.

tests/test_common.py

@@ -77,7 +77,7 @@ def test_mono_trace_level(example_netstandard: Path):
 def test_mono_set_dir(example_netstandard: Path):
     from clr_loader import get_mono
 
-    mono = get_mono(assembly_dir="/usr/lib", config_dir="/etc")
+    mono = get_mono(assembly_dir="/usr", config_dir="/etc")
     asm = mono.get_assembly(example_netstandard / "example.dll")
 
     run_tests(asm)