Revert "Remove unnecessary path resolution"

This reverts commit 05182ef.

This introduced a bug where entering a sub-directory would deactivate
the environment.

pyautoenv.py

@@ -72,7 +72,7 @@ def parse_args(argv: List[str], stdout: TextIO) -> str:
     # is not too complex. We won't get a full 'bells and whistles' CLI
     # experience, but that's fine for our use-case.
     if len(argv) == 0:
-        return "."
+        return os.getcwd()
     if any(h in argv for h in ["-h", "--help"]):
         stdout.write(CLI_HELP)
         sys.exit(0)
@@ -83,7 +83,7 @@ def parse_args(argv: List[str], stdout: TextIO) -> str:
         raise ValueError(  # noqa: TRY003
             f"exactly one argument expected, found {len(argv)}",
         )
-    return argv[0]
+    return os.path.abspath(argv[0])
 
 
 def discover_env(directory: str) -> Union[str, None]:

test_pyautoenv.py

@@ -61,7 +61,7 @@ def setup_method(self):
     def test_directory_is_cwd_by_default(self):
         directory = pyautoenv.parse_args([], self.stdout)
 
-        assert os.path.samefile(directory, Path.cwd())
+        assert directory == str(Path.cwd())
 
     def test_directory_is_set(self):
         directory = pyautoenv.parse_args(["/some/dir"], self.stdout)
@@ -167,7 +167,7 @@ def test_deactivate_and_activate_switching_to_new_venv(
         activator,
     ):
         stdout = StringIO()
-        new_venv_activate = Path("pyproj2/.venv") / activator
+        new_venv_activate = Path("/pyproj2/.venv") / activator
         fs.create_file(new_venv_activate)
         activate_venv(self.VENV_DIR)