chore: Addressing gemini code review comments

Author: mahendra-google

Src/Support/Google.Apis.Tests/Apis/Upload/ResumableUploadTest.MultiChunk.cs

@@ -507,7 +507,7 @@ public void TestUploadInPartialServer(
         /// </summary>
         [Theory, CombinatorialData]
         public void TestChunkedUpload_CompletesAndVerifiesChecksumInPartialServer(
-            [CombinatorialValues(true)] bool knownSize,
+            [CombinatorialValues(true, false)] bool knownSize,
             [CombinatorialValues(80, 150)] int partialSize,
             [CombinatorialValues(100, 200)] int chunkSize)
         {
@@ -521,10 +521,19 @@ public void TestChunkedUpload_CompletesAndVerifiesChecksumInPartialServer(
                 var progress = uploader.Upload();
                 Assert.Equal(expectedCallCount, server.Requests.Count);
                 var request = server.Requests.Last();
-                Assert.Contains(ResumableUpload.GoogleHashHeader, request.Headers.AllKeys);
-                var headerValue = request.Headers[ResumableUpload.GoogleHashHeader];
-                var expectedBase64Hash = CalculateCrc32c(UploadTestBytes);
-                Assert.Equal($"crc32c={expectedBase64Hash}", headerValue);
+
+                if (knownSize)
+                {
+                    Assert.Contains(ResumableUpload.GoogleHashHeader, request.Headers.AllKeys);
+                    var headerValue = request.Headers[ResumableUpload.GoogleHashHeader];
+                    var expectedBase64Hash = CalculateCrc32c(UploadTestBytes);
+                    Assert.Equal($"crc32c={expectedBase64Hash}", headerValue);
+                }
+                else
+                {
+                    Assert.DoesNotContain(ResumableUpload.GoogleHashHeader, request.Headers.AllKeys);
+                }
+
                 Assert.Equal(UploadTestBytes, server.Bytes);
                 Assert.Equal(UploadStatus.Completed, progress.Status);
             }
@@ -536,9 +545,8 @@ public void TestChunkedUpload_CompletesAndVerifiesChecksumInPartialServer(
         [Fact]
         public async Task TestInitiateSessionWithMatchingCrc32c()
         {
-            int partialSize = 80;
             var content = new MemoryStream(UploadTestBytes);
-            using (var server = new MultiChunkPartialServer(_server, partialSize))
+            using (var server = new MultiChunkServer(_server))
             using (var service = new MockClientService(server.HttpPrefix))
             {
                 var chunkSize = 1024;
@@ -567,9 +575,8 @@ public async Task TestInitiateSessionWithMatchingCrc32c()
         [Fact]
         public async Task TestInitiateSessionWithMismatchingCrc32c()
         {
-            int partialSize = 80;
             var content = new MemoryStream(UploadTestBytes);
-            using (var server = new MultiChunkPartialServer(_server, partialSize))
+            using (var server = new MultiChunkServer(_server))
             using (var service = new MockClientService(server.HttpPrefix))
             {
                 var chunkSize = 1024;