should be it

external/duckdb/test/extension/loadable_parser_override.test

@@ -0,0 +1,64 @@
+# name: test/extension/loadable_parser_override.test
+# description: Try loading a parser override with an extension
+# group: [extension]
+
+require skip_reload
+
+statement error
+override
+----
+Parser Error: syntax error at or near "override"
+
+statement ok
+LOAD '__BUILD_DIRECTORY__/test/extension/loadable_extension_demo.duckdb_extension';
+
+statement error
+set allow_parser_override_extension=doesnotexist;
+----
+Invalid Input Error: Unrecognized value for parser override setting. Valid options are: "default", "fallback", "strict".
+
+# Default behavior is not using the parser override
+statement error
+override
+----
+Parser Error: syntax error at or near "override"
+
+# Fallback behavior is trying the parser override and if they error falling back to the default parser
+statement ok
+set allow_parser_override_extension=fallback;
+
+# The QuackParser can return a valid SQLStatement for this query
+query I
+override
+----
+The DuckDB parser has been overridden
+
+# The parser cannot return a valid SQLStatement for this query, the default parser also gets an error
+statement error
+over
+----
+Parser Error: syntax error at or near "over"
+
+
+query I
+SELECT 1;
+----
+1
+
+statement ok
+set allow_parser_override_extension=strict;
+
+query I
+override
+----
+The DuckDB parser has been overridden
+
+statement error
+over
+----
+Parser Error: Parser override could not parse this query. (Original error: Parser overridden, query equaled "over" but not "override")
+
+statement error
+SELECT 1;
+----
+<REGEX>:.*Parser Error: Parser override failed.*