implemented generic tests for config based test flow creation

examples/svelte/src/app.d.ts

@@ -1,4 +1,7 @@
 // See https://kit.svelte.dev/docs/types#app
+
+import type { Edge, Node, SvelteFlowProps } from '@xyflow/svelte';
+
 // for information about these interfaces
 declare global {
 	namespace App {
@@ -7,6 +10,10 @@ declare global {
 		// interface PageData {}
 		// interface Platform {}
 	}
+
+	interface GenericTestCase {
+		svelteFlowProps: Omit<SvelteFlowProps, 'nodes' | 'edges'> & { nodes: Node[]; edges: Edge[] };
+	}
 }
 
 export {};