Add some tests for the single node in way case

Author: joto

tests/bdd/flex/geometry-collection.feature

@@ -69,8 +69,25 @@ Feature: Create geometry collections from relations
         When running osm2pgsql flex
 
         Then table osm2pgsql_test_collection contains exactly
-            | osm_id | name   | ST_GeometryType(geom) |
-            | 30     | foo    | NULL                  |
-            | 31     | bar    | NULL                  |
-            | 32     | baz    | NULL                  |
+            | osm_id | name   | geom |
+            | 30     | foo    | NULL |
+            | 31     | bar    | NULL |
+            | 32     | baz    | NULL |
+
+    Scenario: Null geometry generated for broken way lines
+        Given the grid
+            | 10 |
+        And the OSM data
+            """
+            w20 Nn10
+            w21 Nn10,n10
+            r30 Tname=w20 Mw20@
+            r31 Tname=w21 Mw21@
+            """
+        When running osm2pgsql flex
+
+        Then table osm2pgsql_test_collection contains exactly
+            | osm_id | name  | geom |
+            | 30     | w20   | NULL |
+            | 31     | w21   | NULL |
 

tests/test-geom-collections.cpp

@@ -81,3 +81,13 @@ TEST_CASE("create_collection from no OSM data returns null geometry", "[NoDB]")
     REQUIRE(geometry_type(geom) == "NULL");
     REQUIRE(num_geometries(geom) == 0);
 }
+
+TEST_CASE("create_collection from OSM data with single-node way", "[NoDB]")
+{
+    test_buffer_t buffer;
+    buffer.add_way("w20 Nn1x1y1");
+
+    auto const geom = geom::create_collection(buffer.buffer());
+
+    REQUIRE(geom.is_null());
+}