https://github.com/ashgti updated 
https://github.com/llvm/llvm-project/pull/139937

>From 6f947e38ad4f744754cf13c1094c4e5e3fd249b6 Mon Sep 17 00:00:00 2001
From: John Harrison <harj...@google.com>
Date: Wed, 14 May 2025 10:31:40 -0700
Subject: [PATCH 1/3] [lldb-dap] Setup DAP for unit testing.

This is a very simple case that currently only validates we can create a DAP 
instance and send a message over the transport layer. More in-depth tests will 
require additional helpers and possibly refactors of DAP to make it more 
testable, however this is some ground work to have basic support for unit tests.
---
 lldb/tools/lldb-dap/DAP.h         |  3 +-
 lldb/unittests/DAP/CMakeLists.txt |  1 +
 lldb/unittests/DAP/DAPTest.cpp    | 63 +++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 lldb/unittests/DAP/DAPTest.cpp

diff --git a/lldb/tools/lldb-dap/DAP.h b/lldb/tools/lldb-dap/DAP.h
index c2e4c2dea582e..2ff66d1cd0182 100644
--- a/lldb/tools/lldb-dap/DAP.h
+++ b/lldb/tools/lldb-dap/DAP.h
@@ -226,7 +226,8 @@ struct DAP {
   /// \param[in] default_repl_mode
   ///     Default repl mode behavior, as configured by the binary.
   /// \param[in] pre_init_commands
-  ///     LLDB commands to execute as soon as the debugger instance is 
allocaed.
+  ///     LLDB commands to execute as soon as the debugger instance is
+  ///     allocated.
   /// \param[in] transport
   ///     Transport for this debug session.
   DAP(Log *log, const ReplMode default_repl_mode,
diff --git a/lldb/unittests/DAP/CMakeLists.txt 
b/lldb/unittests/DAP/CMakeLists.txt
index 110733e93b192..6074e9b872c49 100644
--- a/lldb/unittests/DAP/CMakeLists.txt
+++ b/lldb/unittests/DAP/CMakeLists.txt
@@ -3,6 +3,7 @@ add_lldb_unittest(DAPTests
   LLDBUtilsTest.cpp
   TransportTest.cpp
   ProtocolTypesTest.cpp
+  DAPTest.cpp
 
   LINK_LIBS
     lldbDAP
diff --git a/lldb/unittests/DAP/DAPTest.cpp b/lldb/unittests/DAP/DAPTest.cpp
new file mode 100644
index 0000000000000..9d2a9b944678e
--- /dev/null
+++ b/lldb/unittests/DAP/DAPTest.cpp
@@ -0,0 +1,63 @@
+//===-- DAPTest.cpp -------------------------------------------------===//
+//
+// 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 "DAP.h"
+#include "Protocol/ProtocolBase.h"
+#include "Transport.h"
+#include "lldb/Host/File.h"
+#include "lldb/Host/Pipe.h"
+#include "llvm/Testing/Support/Error.h"
+#include "gtest/gtest.h"
+#include <chrono>
+#include <memory>
+#include <optional>
+
+using namespace llvm;
+using namespace lldb;
+using namespace lldb_dap;
+using namespace lldb_dap::protocol;
+using lldb_private::File;
+using lldb_private::NativeFile;
+using lldb_private::Pipe;
+
+class DAPTest : public testing::Test {
+protected:
+  Pipe input;
+  Pipe output;
+  std::unique_ptr<Transport> toDAP;
+  std::unique_ptr<Transport> fromDAP;
+
+  void SetUp() override {
+    ASSERT_THAT_ERROR(input.CreateNew(false).ToError(), Succeeded());
+    ASSERT_THAT_ERROR(output.CreateNew(false).ToError(), Succeeded());
+    toDAP = std::make_unique<Transport>(
+        "toDAP", nullptr,
+        std::make_shared<NativeFile>(input.GetReadFileDescriptor(),
+                                     File::eOpenOptionReadOnly,
+                                     NativeFile::Unowned),
+        std::make_shared<NativeFile>(output.GetWriteFileDescriptor(),
+                                     File::eOpenOptionWriteOnly,
+                                     NativeFile::Unowned));
+    fromDAP = std::make_unique<Transport>(
+        "fromDAP", nullptr,
+        std::make_shared<NativeFile>(output.GetReadFileDescriptor(),
+                                     File::eOpenOptionReadOnly,
+                                     NativeFile::Unowned),
+        std::make_shared<NativeFile>(input.GetWriteFileDescriptor(),
+                                     File::eOpenOptionWriteOnly,
+                                     NativeFile::Unowned));
+  }
+};
+
+TEST_F(DAPTest, SendProtocolMessages) {
+  DAP dap{nullptr, ReplMode::Auto, {}, *toDAP};
+  dap.Send(Event{"my-event", std::nullopt});
+  ASSERT_THAT_EXPECTED(fromDAP->Read(std::chrono::milliseconds(1)),
+                       HasValue(testing::VariantWith<Event>(testing::FieldsAre(
+                           /*event=*/"my-event", /*body=*/std::nullopt))));
+}

>From 8bc4880a338dd0d0f2daa64b77c8bdbf567270b2 Mon Sep 17 00:00:00 2001
From: John Harrison <harj...@google.com>
Date: Wed, 14 May 2025 10:46:51 -0700
Subject: [PATCH 2/3] Adjusting the naming of variables.

---
 lldb/unittests/DAP/DAPTest.cpp | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/lldb/unittests/DAP/DAPTest.cpp b/lldb/unittests/DAP/DAPTest.cpp
index 9d2a9b944678e..8e8c2ea3ccbb0 100644
--- a/lldb/unittests/DAP/DAPTest.cpp
+++ b/lldb/unittests/DAP/DAPTest.cpp
@@ -29,22 +29,22 @@ class DAPTest : public testing::Test {
 protected:
   Pipe input;
   Pipe output;
-  std::unique_ptr<Transport> toDAP;
-  std::unique_ptr<Transport> fromDAP;
+  std::unique_ptr<Transport> to_dap;
+  std::unique_ptr<Transport> from_dap;
 
   void SetUp() override {
     ASSERT_THAT_ERROR(input.CreateNew(false).ToError(), Succeeded());
     ASSERT_THAT_ERROR(output.CreateNew(false).ToError(), Succeeded());
-    toDAP = std::make_unique<Transport>(
-        "toDAP", nullptr,
+    to_dap = std::make_unique<Transport>(
+        "to_dap", nullptr,
         std::make_shared<NativeFile>(input.GetReadFileDescriptor(),
                                      File::eOpenOptionReadOnly,
                                      NativeFile::Unowned),
         std::make_shared<NativeFile>(output.GetWriteFileDescriptor(),
                                      File::eOpenOptionWriteOnly,
                                      NativeFile::Unowned));
-    fromDAP = std::make_unique<Transport>(
-        "fromDAP", nullptr,
+    from_dap = std::make_unique<Transport>(
+        "from_dap", nullptr,
         std::make_shared<NativeFile>(output.GetReadFileDescriptor(),
                                      File::eOpenOptionReadOnly,
                                      NativeFile::Unowned),
@@ -55,9 +55,9 @@ class DAPTest : public testing::Test {
 };
 
 TEST_F(DAPTest, SendProtocolMessages) {
-  DAP dap{nullptr, ReplMode::Auto, {}, *toDAP};
+  DAP dap{nullptr, ReplMode::Auto, {}, *to_dap};
   dap.Send(Event{"my-event", std::nullopt});
-  ASSERT_THAT_EXPECTED(fromDAP->Read(std::chrono::milliseconds(1)),
+  ASSERT_THAT_EXPECTED(from_dap->Read(std::chrono::milliseconds(1)),
                        HasValue(testing::VariantWith<Event>(testing::FieldsAre(
                            /*event=*/"my-event", /*body=*/std::nullopt))));
 }

>From 41f8f41a6cae98c6e0fe703f5b34f9f3f4acba9a Mon Sep 17 00:00:00 2001
From: John Harrison <harj...@google.com>
Date: Wed, 14 May 2025 10:51:12 -0700
Subject: [PATCH 3/3] Adding inline comments to improve readability.

---
 lldb/unittests/DAP/DAPTest.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lldb/unittests/DAP/DAPTest.cpp b/lldb/unittests/DAP/DAPTest.cpp
index 8e8c2ea3ccbb0..e23fb32eebea9 100644
--- a/lldb/unittests/DAP/DAPTest.cpp
+++ b/lldb/unittests/DAP/DAPTest.cpp
@@ -55,8 +55,9 @@ class DAPTest : public testing::Test {
 };
 
 TEST_F(DAPTest, SendProtocolMessages) {
-  DAP dap{nullptr, ReplMode::Auto, {}, *to_dap};
-  dap.Send(Event{"my-event", std::nullopt});
+  DAP dap{/*log=*/nullptr, /*default_repl_mode=*/ReplMode::Auto,
+          /*pre_init_commands=*/{}, /*transport=*/*to_dap};
+  dap.Send(Event{/*event=*/"my-event", /*body=*/std::nullopt});
   ASSERT_THAT_EXPECTED(from_dap->Read(std::chrono::milliseconds(1)),
                        HasValue(testing::VariantWith<Event>(testing::FieldsAre(
                            /*event=*/"my-event", /*body=*/std::nullopt))));

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