diff --git a/openapi_generator_cli/__init__.py b/openapi_generator_cli/__init__.py
index e4519b4..bf28fff 100644
--- a/openapi_generator_cli/__init__.py
+++ b/openapi_generator_cli/__init__.py
@@ -56,12 +56,17 @@ def run(args: list[str] | None = None) -> subprocess.CompletedProcess[bytes]:
     return subprocess.run(arguments, check=False)  # noqa: S603
 
 
-def cli() -> None:
-    """Run the OpenAPI Generator CLI with the arguments provided on the command line."""
-    args = []
-    if len(sys.argv) > 1:
-        args = sys.argv[1:]
-    run(args)
+def cli(argv: list[str] | None = None) -> None:
+    """Run the OpenAPI Generator CLI with the arguments provided on the command line.
+
+    Args:
+        argv (list[str], optional):
+            The command-line arguments to pass to the OpenAPI Generator CLI.
+            If not provided, sys.argv is used.
+
+    """
+    args = (argv or sys.argv)[1:]
+    sys.exit(run(args).returncode)
 
 
 if __name__ == "__main__":
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 60c160d..b9945dd 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -2,12 +2,10 @@
 
 import os
 import re
-from typing import TYPE_CHECKING
 
-from openapi_generator_cli import run
+import pytest
 
-if TYPE_CHECKING:
-    import pytest
+from openapi_generator_cli import cli, run
 
 
 def test_cli_version(capfd: pytest.CaptureFixture[str]) -> None:
@@ -45,3 +43,16 @@ def test_invalid_arg(capfd: pytest.CaptureFixture[str]) -> None:
         "Found unexpected parameters: [--invalid-arg-404]"
         in captured.err.split(os.linesep)[0]
     )
+
+
+def test_cli_invalid_arg(capfd: pytest.CaptureFixture[str]) -> None:
+    with pytest.raises(SystemExit) as exc_info:
+        cli(["openapi-generator-cli", "--invalid-arg-404"])
+    assert exc_info.value.code == 1
+
+    captured = capfd.readouterr()
+    assert not captured.out
+    assert (
+        "Found unexpected parameters: [--invalid-arg-404]"
+        in captured.err.split(os.linesep)[0]
+    )