Test SQL profile capability preflight

Author: TonisOrmisson

tests/test_sql_profiles.py

@@ -0,0 +1,21 @@
+import pytest
+
+from openstatspec.core import UnsupportedOperationError
+from openstatspec.sql.profiles import MYSQL, POSTGRESQL, SQLITE, preflight, profile_for_url
+
+
+def test_profile_detection_tracks_supported_dialect_urls() -> None:
+    assert profile_for_url("sqlite:///dataset.sqlite") is SQLITE
+    assert profile_for_url("postgresql+psycopg://user@host/database") is POSTGRESQL
+    assert profile_for_url("mysql+pymysql://user@host/database") is MYSQL
+    assert profile_for_url("mariadb+mariadbconnector://user@host/database") is MYSQL
+
+
+def test_profile_preflight_fails_without_transforming_a_wide_dataset() -> None:
+    with pytest.raises(UnsupportedOperationError, match="Target capability exceeded"):
+        preflight(POSTGRESQL, POSTGRESQL.max_physical_variables + 1)
+
+
+def test_unknown_target_is_explicitly_rejected() -> None:
+    with pytest.raises(UnsupportedOperationError, match="No OpenStatSpec SQL profile"):
+        profile_for_url("oracle://host/database")