Add unit test for postgres layer metadata

tests/src/python/test_provider_postgres.py

@@ -37,6 +37,7 @@
     QgsReadWriteContext,
     QgsRectangle,
     QgsDefaultValue,
+    QgsCoordinateReferenceSystem,
     QgsProject,
     QgsWkbTypes,
     QgsGeometry
@@ -197,6 +198,13 @@ def test_table(dbconn, table_name, wkt):
 
         test_table(self.dbconn, 'pt4d', 'PointZM (1 2 3 4)')
 
+    def testMetadata(self):
+        """ Test that metadata is correctly acquired from provider """
+        metadata = self.vl.metadata()
+        self.assertEqual(metadata.crs(), QgsCoordinateReferenceSystem.fromEpsgId(4326))
+        self.assertEqual(metadata.type(), 'dataset')
+        self.assertEqual(metadata.abstract(), 'QGIS Test Table')
+
     def testGetFeaturesUniqueId(self):
         """
         Test tables with inheritance for unique ids

tests/testdata/provider/testdata_pg.sql

@@ -43,6 +43,8 @@ CREATE TABLE qgis_test."someData" (
     geom public.geometry(Point,4326)
 );
 
+COMMENT ON TABLE qgis_test."someData" IS 'QGIS Test Table';
+
 CREATE TABLE qgis_test."some_poly_data" (
     pk SERIAL NOT NULL,
     geom public.geometry(Polygon,4326)