test(persistQuery): add tests for withPersistQueryClient

packages/angular-persist-query-client-experimental/package.json

@@ -59,6 +59,8 @@
     "@angular/platform-browser-dynamic": "^17.3.12",
     "@microsoft/api-extractor": "^7.47.4",
     "@tanstack/angular-query-experimental": "workspace:*",
+    "@testing-library/angular": "^17.3.2",
+    "@testing-library/dom": "^10.4.0",
     "eslint-plugin-jsdoc": "^50.2.2",
     "tsup": "8.0.2",
     "typescript": "5.3.3"

packages/angular-persist-query-client-experimental/src/__tests__/utils.ts

@@ -0,0 +1,11 @@
+let queryKeyCount = 0
+export function queryKey(): Array<string> {
+  queryKeyCount++
+  return [`query_${queryKeyCount}`]
+}
+
+export function sleep(timeout: number): Promise<void> {
+  return new Promise((resolve, _reject) => {
+    setTimeout(resolve, timeout)
+  })
+}