[blazor][E2E test] BootResourceCachingTest.IncrementallyUpdatesCache faster (#50021)

* make test faster after dotnet/runtime#90264

Co-authored-by: Mackinnon Buck <mackinnon.buck@gmail.com>
Co-authored-by: Marek Fišera <mara@neptuo.com>

Author: 3 people

src/Components/WebAssembly/testassets/HostedInAspNet.Client/wwwroot/index.html

@@ -19,6 +19,11 @@
                 return type === 'dotnetjs'
                     ? `${defaultUri}?customizedbootresource=true`
                     : fetch(defaultUri, { integrity: integrity, cache: 'no-cache', headers: { 'customizedbootresource': 'true' } });
+            },
+            configureRuntime: function (builder) {
+                builder.withConfig({
+                    cachedResourcesPurgeDelay: 0
+                });
             }
         });
     </script>

src/Components/test/E2ETest/Tests/BootResourceCachingTest.cs

@@ -91,9 +91,17 @@ public async Task IncrementallyUpdatesCache()
             requestedDll => Assert.Contains("/Microsoft.AspNetCore.Components.wasm", requestedDll),
             requestedDll => Assert.Contains("/dotnet.native.wasm", requestedDll));
 
-        // We also update the cache (add new items, remove unnecessary items)
-        await Task.Delay(10500); // wait for cache purge, which is 10 seconds delayed after app start
         var cacheEntryUrls3 = GetCacheEntryUrls();
+        // wait until the cache was cleaned, max 500ms
+        for (var i = 0; i < 5; i++)
+        {
+            if (!cacheEntryUrls3.Contains(cacheEntryForDotNetWasmWithChangedHash))
+            {
+                break;
+            }
+            await Task.Delay(100); // wait for cache purge
+            cacheEntryUrls3 = GetCacheEntryUrls();
+        }
         Assert.Contains(cacheEntryForComponentsDll, cacheEntryUrls3);
         Assert.Contains(cacheEntryForDotNetWasm, cacheEntryUrls3);
         Assert.DoesNotContain(cacheEntryForDotNetWasmWithChangedHash, cacheEntryUrls3);