Fix WKT for empty geometry collections (#132)

Author: LachlanArthur

src/Objects/GeometryCollection.php

@@ -42,6 +42,10 @@ public function toWkt(): string
     {
         $wktData = $this->getWktData();
 
+        if ($wktData === '') {
+            return 'GEOMETRYCOLLECTION EMPTY';
+        }
+
         return "GEOMETRYCOLLECTION({$wktData})";
     }
 

tests/Objects/GeometryCollectionTest.php

@@ -669,3 +669,9 @@
         TestPlace::factory()->create(['geometry_collection' => $geometryCollection]);
     })->toThrow(InvalidArgumentException::class);
 });
+
+it('generates empty geometry collection WKT', function (): void {
+    $geometryCollection = new GeometryCollection([]);
+
+    expect($geometryCollection->toWkt())->toBe('GEOMETRYCOLLECTION EMPTY');
+});