diff --git a/lldb/unittests/Process/gdb-remote/GDBRemoteCommunicationServerTest.cpp b/lldb/unittests/Process/gdb-remote/GDBRemoteCommunicationServerTest.cpp
new file mode 100644
index 0000000..a73f7b4
--- /dev/null
+++ b/lldb/unittests/Process/gdb-remote/GDBRemoteCommunicationServerTest.cpp
@@ -0,0 +1,73 @@
+//===-- GDBRemoteCommunicationServerTest.cpp --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+#include "GDBRemoteTestUtils.h"
+
+#include "Plugins/Process/gdb-remote/GDBRemoteCommunicationServer.h"
+#include "lldb/Utility/Connection.h"
+
+namespace lldb_private {
+namespace process_gdb_remote {
+
+TEST(GDBRemoteCommunicationServerTest, SendErrorResponse_ErrorNumber) {
+  MockServerWithMockConnection server;
+  server.SendErrorResponse(0x42);
+
+  EXPECT_THAT(server.GetPackets(), testing::ElementsAre("$E42#ab"));
+}
+
+TEST(GDBRemoteCommunicationServerTest, SendErrorResponse_Status) {
+  MockServerWithMockConnection server;
+  Status status;
+
+  status.SetError(0x42, lldb::eErrorTypeGeneric);
+  status.SetErrorString("Test error message");
+  server.SendErrorResponse(status);
+
+  EXPECT_THAT(
+      server.GetPackets(),
+      testing::ElementsAre("$E42;54657374206572726f72206d657373616765#ad"));
+}
+
+TEST(GDBRemoteCommunicationServerTest, SendErrorResponse_UnimplementedError) {
+  MockServerWithMockConnection server;
+
+  auto error =
+      llvm::make_error<PacketUnimplementedError>("Test unimplemented error");
+  server.SendErrorResponse(std::move(error));
+
+  EXPECT_THAT(server.GetPackets(), testing::ElementsAre("$#00"));
+}
+
+TEST(GDBRemoteCommunicationServerTest, SendErrorResponse_StringError) {
+  MockServerWithMockConnection server;
+
+  auto error = llvm::createStringError(llvm::inconvertibleErrorCode(),
+                                       "String error test");
+  server.SendErrorResponse(std::move(error));
+
+  EXPECT_THAT(
+      server.GetPackets(),
+      testing::ElementsAre("$Eff;537472696e67206572726f722074657374#b0"));
+}
+
+TEST(GDBRemoteCommunicationServerTest, SendErrorResponse_ErrorList) {
+  MockServerWithMockConnection server;
+
+  auto error = llvm::joinErrors(llvm::make_error<PacketUnimplementedError>(),
+                                llvm::make_error<PacketUnimplementedError>());
+
+  server.SendErrorResponse(std::move(error));
+  // Make sure only one packet is sent even when there are multiple errors.
+  EXPECT_EQ(server.GetPackets().size(), 1UL);
+}
+
+} // namespace process_gdb_remote
+} // namespace lldb_private