Validate token expiration is in range

Author: javiercn

src/Components/Blazor/testassets/Wasm.Authentication.Client/Pages/User.razor

@@ -23,9 +23,9 @@
 
 @if (AccessToken != null)
 {
-    <h2>Current time: @DateTimeOffset.Now</h2>
     <h2>Access token expires</h2>
-    <p>@AccessToken.Expires</p>
+    <p>Current time: <span id="current-time">@DateTimeOffset.Now</span></p>
+    <p id="access-token-expires">@AccessToken.Expires</p>
 
     <h2>Access token granted scopes (as reported by the API)</h2>
     @foreach (var scope in AccessToken.GrantedScopes)

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

@@ -158,6 +158,11 @@ public void AuthenticatedUser_ProfileIncludesDetails_And_AccessToken()
                 "Wasm.Authentication.ServerAPI"
             },
             payload.Scopes);
+
+            var currentTime = DateTimeOffset.Parse(Browser.Exists(By.Id("current-time")).Text);
+            var tokenExpiration = DateTimeOffset.Parse(Browser.Exists(By.Id("access-token-expires")).Text);
+            Assert.True(currentTime.AddMinutes(50) < tokenExpiration);
+            Assert.True(currentTime.AddMinutes(60) >= tokenExpiration);
         }
 
         [Fact]