Remove one of the placeholder tests

cpp/src/arrow/filesystem/azurefs_test.cc

@@ -124,33 +124,6 @@ AzuriteEnv* GetAzuriteEnv() {
 
 // Placeholder tests
 // TODO: GH-18014 Remove once a proper test is added
-TEST(AzureFileSystem, UploadThenDownload) {
-  const std::string container_name = "sample-container";
-  const std::string blob_name = "sample-blob.txt";
-  const std::string blob_content = "Hello Azure!";
-
-  const std::string& account_name = GetAzuriteEnv()->account_name();
-  const std::string& account_key = GetAzuriteEnv()->account_key();
-
-  auto credential = std::make_shared<Azure::Storage::StorageSharedKeyCredential>(
-      account_name, account_key);
-
-  auto service_client = Azure::Storage::Blobs::BlobServiceClient(
-      std::string("http://127.0.0.1:10000/") + account_name, credential);
-  auto container_client = service_client.GetBlobContainerClient(container_name);
-  container_client.CreateIfNotExists();
-  auto blob_client_ = container_client.GetBlockBlobClient(blob_name);
-
-  std::vector<uint8_t> buffer(blob_content.begin(), blob_content.end());
-  blob_client_.UploadFrom(buffer.data(), buffer.size());
-
-  std::vector<uint8_t> downloaded_content(blob_content.size());
-  blob_client_.DownloadTo(downloaded_content.data(), downloaded_content.size());
-
-  EXPECT_EQ(std::string(downloaded_content.begin(), downloaded_content.end()),
-            blob_content);
-}
-
 TEST(AzureFileSystem, InitializeCredentials) {
   auto default_credential = std::make_shared<Azure::Identity::DefaultAzureCredential>();
   auto managed_identity_credential =