Added a test for the direct determination of geometry type/srid

Author: SebDieBln

tests/src/python/test_provider_postgres.py

@@ -59,6 +59,14 @@ def testDefaultValue(self):
         assert self.provider.defaultValue(1) == NULL
         assert self.provider.defaultValue(2) == '\'qgis\'::text'
 
+    def testQueryLayers(self):
+        def test_query(dbconn, query, key):
+            ql = QgsVectorLayer('%s srid=4326 table="%s" (geom) key=\'%s\' sql=' % (dbconn, query.replace('"', '\\"'), key), "testgeom", "postgres")
+            print query, key
+            assert(ql.isValid())
+
+        test_query(self.dbconn, '(SELECT NULL::integer "Id1", NULL::integer "Id2", NULL::geometry(Point, 4326) geom LIMIT 0)', '"Id1","Id2"')
+
     def testWkbTypes(self):
         def test_table(dbconn, table_name, wkt):
             vl = QgsVectorLayer('%s srid=4326 table="qgis_test".%s (geom) sql=' % (dbconn, table_name), "testgeom", "postgres")