🧪 Fix referrer assertion in Next.js router tests after query param stripping

When Next.js hydrates with the test query params (rum-config, rum-context)
stripped via history.replaceState, the referrer recorded by RUM for SPA
navigations is the clean home URL (without params) rather than the full
baseUrl. Update the shared test to account for this with a
stripsTestQueryParams flag, and enable it for the Next.js scenarios.

Author: thomas-lebeau

test/e2e/scenario/plugins/basePluginRouterTests.ts

@@ -8,6 +8,12 @@ interface RouterConfig {
   homeUrlPattern: string | RegExp
   userRouteName: string
   guidesRouteName: string
+  /**
+   * Set to true when the app strips test query params (rum-config, rum-context) from the URL
+   * on load (e.g. via history.replaceState). When true, the referrer for the first SPA navigation
+   * will be the clean home URL (without query params) instead of the full baseUrl.
+   */
+  stripsTestQueryParams?: boolean
 }
 
 interface RouterPluginTestConfig {
@@ -19,7 +25,7 @@ interface RouterPluginTestConfig {
 
 export function runBasePluginRouterTests(configs: RouterPluginTestConfig[]) {
   for (const { name, loadApp, viewPrefix, router } of configs) {
-    const { homeViewName, homeUrlPattern, userRouteName, guidesRouteName } = router
+    const { homeViewName, homeUrlPattern, userRouteName, guidesRouteName, stripsTestQueryParams } = router
 
     test.describe(`base plugin: ${name}`, () => {
       test.describe('router', () => {
@@ -61,7 +67,9 @@ export function runBasePluginRouterTests(configs: RouterPluginTestConfig[]) {
             expect(guidesView).toBeDefined()
             expect(guidesView?.view.loading_type).toBe('route_change')
             expect(guidesView?.view.url).toContain('/guides/123')
-            expect(guidesView?.view.referrer).toBe(baseUrl)
+            expect(guidesView?.view.referrer).toBe(
+              stripsTestQueryParams ? `${baseOrigin}${homeViewName}` : baseUrl
+            )
 
             const userView = viewEvents.find((e) => e.view.name === `${viewPrefix}${userRouteName}`)
             expect(userView).toBeDefined()

test/e2e/scenario/plugins/nextjsPlugin.scenario.ts

@@ -30,6 +30,7 @@ runBasePluginRouterTests(
       homeUrlPattern,
       userRouteName: '/user/[id]',
       guidesRouteName: '/guides/[...slug]',
+      stripsTestQueryParams: true,
     },
   }))
 )