added tests for rule34 (non sufficient)

src/plugins/rule34/api.ts

@@ -1,3 +1,5 @@
+import { assert } from "@std/assert/assert";
+
 type APIResponse = Array<{
     preview_url: string;
     sample_url: string;
@@ -82,3 +84,13 @@ export async function drop5() {
     }
     return tmp;
 }
+
+
+//test refresh here because local stack is not given to other functions
+Deno.test("Test Image-Stack refresh", async() => {
+    await refresh()
+    const previousStack = [...hyperlinkarray]
+    await new Promise(r => setTimeout(r, 10000));
+    await refresh()
+    assert(previousStack.length <= hyperlinkarray.length, "Stack-size did not increase as expected!")
+})