Add a test that opening two separate FDBs at the same time works

tests/test_passing_config_directly.py

@@ -34,3 +34,50 @@ def test_direct_config():
         # On OSX tmp file paths look like /private/var/folders/.../T/tmp.../x138-300.grib
         # While the tmp directory looks like /var/folders/.../T/tmp.../ hence why this check is not "startwith"
         assert tmp_root in list_output[0]["path"]
+
+
+def test_opening_two_fdbs():
+    with TemporaryDirectory() as tmp_root1, TemporaryDirectory() as tmp_root2:
+        tests_dir = Path(__file__).parent
+
+        fdb1 = pyfdb.FDB(
+            dict(
+                type="local",
+                engine="toc",
+                schema=str(tests_dir / "default_fdb_schema"),
+                spaces=[
+                    dict(
+                        handler="Default",
+                        roots=[
+                            {"path": tmp_root1},
+                        ],
+                    )
+                ],
+            )
+        )
+
+        fdb2 = pyfdb.FDB(
+            dict(
+                type="local",
+                engine="toc",
+                schema=str(tests_dir / "default_fdb_schema"),
+                spaces=[
+                    dict(
+                        handler="Default",
+                        roots=[
+                            {"path": tmp_root2},
+                        ],
+                    )
+                ],
+            )
+        )
+
+        for fdb in [fdb1, fdb2]:
+            data = open(tests_dir / "x138-300.grib", "rb").read()
+            fdb.archive(data)
+            fdb.flush()
+
+        for fdb, root in [(fdb1, tmp_root1), (fdb2, tmp_root2)]:
+            list_output = list(fdb.list(keys=True))
+            assert len(list_output) == 1
+            assert root in list_output[0]["path"]