tests: try multiple times to get a database name (#42634)

tests/test_convert_to_sql.py

@@ -47,8 +47,17 @@ def cursor():
 
 @pytest.fixture
 def database(cursor):
-    dbname = 'wcstests%d' % random.randint(0, 100000)
-    cursor.execute('CREATE DATABASE %s' % dbname)
+    i = 0
+    while True:
+        dbname = 'wcstests%d' % random.randint(0, 100000)
+        try:
+            cursor.execute('CREATE DATABASE %s' % dbname)
+            break
+        except psycopg2.Error:
+            if i < 5:
+                i += 1
+                continue
+            raise
     yield dbname
     cleanup_connection()
     cursor.execute('DROP DATABASE %s' % dbname)