Updates after rebase

Author: JunTaoLuo

test/Microsoft.AspNetCore.ResponseCaching.Tests/ResponseCachingTests.cs

@@ -689,15 +689,7 @@ public async void ServesCachedContent_IfIfModifiedSince_NotSatisfied()
                 client.DefaultRequestHeaders.IfUnmodifiedSince = DateTimeOffset.MinValue;
                 var subsequentResponse = await client.GetAsync("");
 
-                initialResponse.EnsureSuccessStatusCode();
-                subsequentResponse.EnsureSuccessStatusCode();
-
-                foreach (var header in initialResponse.Headers)
-                {
-                    Assert.Equal(initialResponse.Headers.GetValues(header.Key), subsequentResponse.Headers.GetValues(header.Key));
-                }
-                Assert.True(subsequentResponse.Headers.Contains(HeaderNames.Age));
-                Assert.Equal(await initialResponse.Content.ReadAsStringAsync(), await subsequentResponse.Content.ReadAsStringAsync());
+                await AssertResponseCachedAsync(initialResponse, subsequentResponse);
             }
         }
 
@@ -756,15 +748,7 @@ public async void ServesCachedContent_IfIfNoneMatch_NotSatisfied()
                 client.DefaultRequestHeaders.IfNoneMatch.Add(new System.Net.Http.Headers.EntityTagHeaderValue("\"E2\""));
                 var subsequentResponse = await client.GetAsync("");
 
-                initialResponse.EnsureSuccessStatusCode();
-                subsequentResponse.EnsureSuccessStatusCode();
-
-                foreach (var header in initialResponse.Headers)
-                {
-                    Assert.Equal(initialResponse.Headers.GetValues(header.Key), subsequentResponse.Headers.GetValues(header.Key));
-                }
-                Assert.True(subsequentResponse.Headers.Contains(HeaderNames.Age));
-                Assert.Equal(await initialResponse.Content.ReadAsStringAsync(), await subsequentResponse.Content.ReadAsStringAsync());
+                await AssertResponseCachedAsync(initialResponse, subsequentResponse);
             }
         }