fix: Set OBJC_DISABLE_INITIALIZE_FORK_SAFETY for macOS in CLI integration tests (#4644)

Author: georgesittas

tests/cli/test_integration_cli.py

@@ -7,6 +7,8 @@
 import shutil
 import site
 import uuid
+import os
+import platform
 
 pytestmark = pytest.mark.slow
 
@@ -30,6 +32,11 @@ def invoke_cli(tmp_path: Path) -> InvokeCliType:
     ).stdout.strip()
 
     def _invoke(sqlmesh_args: t.List[str], **kwargs: t.Any) -> subprocess.CompletedProcess:
+        # Set up environment to handle macOS fork safety, see https://stackoverflow.com/a/52230415
+        env = os.environ.copy()
+        if platform.system() == "Darwin":
+            env["OBJC_DISABLE_INITIALIZE_FORK_SAFETY"] = "YES"
+
         return subprocess.run(
             args=[sqlmesh_bin] + sqlmesh_args,
             # set the working directory to the isolated temp dir for this test
@@ -39,6 +46,7 @@ def _invoke(sqlmesh_args: t.List[str], **kwargs: t.Any) -> subprocess.CompletedP
             # combine stdout/stderr into a single stream
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
+            env=env,
             **kwargs,
         )