THRIFT-4547: Swift crosstests (#2670)

Co-authored-by: Jiayu Liu <Jimexist@users.noreply.github.com>
diff --git a/test/swift/CrossTests/Sources/TestServer/main.swift b/test/swift/CrossTests/Sources/TestServer/main.swift
new file mode 100644
index 0000000..15564d3
--- /dev/null
+++ b/test/swift/CrossTests/Sources/TestServer/main.swift
@@ -0,0 +1,59 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import Foundation
+import Thrift
+import Common
+
+class TestServer {
+  var server: Any?
+  
+  func run() throws {
+    let parameters = try TestServerParameters(arguments: CommandLine.arguments)
+    
+    if parameters.showHelp {
+      parameters.printHelp()
+      return
+    }
+    
+    let service = ThriftTestImpl()
+    let processor = ThriftTestProcessor(service: service)
+    
+    
+    switch (parameters.proto, parameters.transport) {
+    case (.binary, .buffered):
+      let proto = TBinaryProtocol.self
+      server = try TSocketServer(port: parameters.port!, inProtocol: proto, outProtocol: proto, processor: processor)
+    case (.binary, .framed):
+      let proto = TBinaryProtocol.self
+      server = try TFramedSocketServer(port: parameters.port!, inProtocol: proto, outProtocol: proto, processor: processor)
+    case (.compact, .buffered):
+      let proto = TCompactProtocol.self
+      server = try TSocketServer(port: parameters.port!, inProtocol: proto, outProtocol: proto, processor: processor)
+    case (.compact, .framed):
+      let proto = TCompactProtocol.self
+      server = try TFramedSocketServer(port: parameters.port!, inProtocol: proto, outProtocol: proto, processor: processor)
+    default:
+      throw ParserError.unsupportedOption
+    }
+  }
+}
+
+let server = TestServer()
+try server.run()
+
+RunLoop.main.run()