make polling function a global function

test/services/NotificationServiceTests.test.ts

@@ -15,6 +15,23 @@ ya+yfGi3g2ZUv6hrfe+j08ytekPHjXS0qzJoVELzKHa6EL9YAoZDXBtB6h+fGhXe
 SOcONbaf
 -----END PRIVATE KEY-----`
 
+/**
+ * Wait for a condition to become true until the timeout
+ * is hit.
+ * @param condition
+ * @param timeout
+ * @param interval
+ */
+async function waitForCondition(condition: () => boolean, timeout = 5000, interval = 500) {
+  const startTime = Date.now();
+  while (!condition()) {
+    if (Date.now() - startTime > timeout) {
+      throw new Error("Timeout waiting for condition");
+    }
+    await new Promise((resolve) => setTimeout(resolve, interval));
+  }
+}
+
 describe("NotificationService", () => {
   let repository: UnoptimizedInMemoryRepository
   let notificationService: NotificationService;
@@ -98,15 +115,6 @@ describe("NotificationService", () => {
       // Assert
       // Because repository publisher calls subscriber without await
       // wait for the change to occur first
-      async function waitForCondition(condition: () => boolean, timeout = 5000, interval = 500) {
-        const startTime = Date.now();
-        while (!condition()) {
-          if (Date.now() - startTime > timeout) {
-            throw new Error("Timeout waiting for condition");
-          }
-          await new Promise((resolve) => setTimeout(resolve, interval));
-        }
-      }
 
       await waitForCondition(() => !notificationService.isNotificationScheduled(notificationData1));