更新

XUnitDIStudy.Test/ControllerTest.cs

@@ -36,7 +36,7 @@ namespace XUnitDIStudy.Test
             // Assert
             response.EnsureSuccessStatusCode(); // Status Code 200-299
 
-            List<Student> result = System.Text.Json.JsonSerializer.Deserialize<List<Student>>(response.Content.ReadAsStringAsync().Result);
+            List<Student> result = System.Text.Json.JsonSerializer.Deserialize<List<Student>>(await response.Content.ReadAsStringAsync());
 
             Assert.NotNull(result);
             Assert.True(result.Count>0);