should be it

external/duckdb/test/sql/attach/show_databases.test

@@ -0,0 +1,38 @@
+# name: test/sql/attach/show_databases.test
+# description: Test SHOW DATABASES and USE
+# group: [attach]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+ATTACH DATABASE ':memory:' AS new_database;
+
+query I
+SHOW DATABASES
+----
+memory
+new_database
+
+query I
+SELECT name FROM pragma_database_list ORDER BY name
+----
+memory
+new_database
+
+# check changing the default database
+statement ok
+USE new_database
+
+statement ok
+CREATE TABLE tbl AS SELECT 42 i
+
+query I
+SELECT * FROM new_database.tbl
+----
+42
+
+statement error
+USE blablabla
+----
+No catalog + schema named "blablabla" found