diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 44d25611..f774663f 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -62,17 +62,17 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Setup llvm binary
-        if: matrix.os == 'ubuntu-24.04'
-        run: |
-          mkdir -p ./.llvm
-          curl -L "https://github.com/clice-project/llvm-binary/releases/download/20.0.0/x86_64-linux-gnu-debug.tar.xz" | tar -xJ -C ./.llvm
-
       - name: Setup llvm binary
         if: matrix.os == 'windows-2025'
         run: |
           curl -O -L "https://github.com/clice-project/llvm-binary/releases/download/20.0.0/x64-windows-msvc-release.7z"
           7z x x64-windows-msvc-release.7z "-o.llvm"
+                  
+      - name: Setup llvm binary
+        if: matrix.os == 'ubuntu-24.04'
+        run: |
+          mkdir -p ./.llvm
+          curl -L "https://github.com/clice-project/llvm-binary/releases/download/20.0.0/x86_64-linux-gnu-debug.tar.xz" | tar -xJ -C ./.llvm
 
       - name: Setup llvm binary
         if: matrix.os == 'macos-15'
@@ -84,6 +84,12 @@ jobs:
         if: matrix.os == 'windows-2025'
         uses: ilammy/msvc-dev-cmd@v1
 
+      - name: Build clice (release)
+        if: matrix.os == 'windows-2025'
+        run: |
+          cmake --preset release
+          cmake --build --preset release
+                  
       - name: Build clice (debug)
         if: matrix.os == 'ubuntu-24.04'
         run: |
@@ -97,16 +103,17 @@ jobs:
           cmake --preset debug
           cmake --build --preset debug -v
 
-      - name: Build clice (release)
-        if: matrix.os == 'windows-2025'
-        run: |
-          cmake --preset release
-          cmake --build --preset release
-
       - name: Install Python dependencies
         run: pip install pytest pytest-asyncio pytest-xdist
 
       - name: Run tests
+        if: matrix.os == 'windows-2025'
+        run: |
+          ./build/bin/unit_tests.exe --test-dir="./tests/data" --resource-dir="./.llvm/lib/clang/20"
+          pytest -s tests/integration --executable=./build/bin/clice.exe
+
+      - name: Run tests
+        if: matrix.os == 'ubuntu-24.04' ||  matrix.os == 'macos-15'
         run: |
           ./build/bin/unit_tests --test-dir="./tests/data" --resource-dir="./.llvm/lib/clang/20"
           pytest -s tests/integration --executable=./build/bin/clice
diff --git a/.gitignore b/.gitignore
index cf2e1f8b..02ef84ea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,6 +34,7 @@
 temp/
 *build*/
 .cache/
+.clice/
 .llvm*/
 .xmake/
 .vscode/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 06b5bec3..d69ac43c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.20)
-project(CLICE_PROJECT LANGUAGES CXX)
+project(CLICE_PROJECT LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
diff --git a/src/Server/Scheduler.cpp b/src/Server/Scheduler.cpp
index 1efbe47d..96fee34a 100644
--- a/src/Server/Scheduler.cpp
+++ b/src/Server/Scheduler.cpp
@@ -109,6 +109,14 @@ async::Task<> Scheduler::buildPCH(std::string path, std::string content) {
                                             std::string content) -> async::Task<> {
         CompilationParams params;
         params.arguments = scheduler.database.get_command(path, true).arguments;
+        if(!fs::exists(config::cache.dir)) {
+            auto error = fs::create_directories(config::cache.dir);
+            if(error) {
+                log::warn("Fail to create directory for PCH building: {}", config::cache.dir);
+                co_return;
+            }
+        }
+
         params.outPath = path::join(config::cache.dir, path::filename(path) + ".pch");
         params.add_remapped_file(path, content, bound);
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 938a5faa..4eb45f30 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -13,8 +13,24 @@ def pytest_addoption(parser):
 
 @pytest.fixture(scope="session")
 def executable(request):
-    path = request.config.getoption("--executable")
-    return Path(path).resolve()
+    executable = request.config.getoption("--executable")
+    if executable is None:
+        pytest.exit(
+            "Error: You must specify the 'clice' executable path using "
+            "'--executable=<path/to/clice>' in pytest arguments, "
+            "or configure it in your pytest.ini/conftest.py.",
+            returncode=64
+        )
+
+    path = Path(executable)
+    if not path.exists():
+        pytest.exit(
+            f"Error: 'clice' executable not found at '{executable}'. "
+            "Please ensure the path is correct and the file exists.",
+            returncode=64
+        )
+
+    return path.resolve()
 
 
 @pytest.fixture(scope="session")
diff --git a/tests/fixtures/client.py b/tests/fixtures/client.py
index c03ae44b..36e235f6 100644
--- a/tests/fixtures/client.py
+++ b/tests/fixtures/client.py
@@ -5,6 +5,8 @@ from .transport import LSPTransport
 class LSPClient(LSPTransport):
     def __init__(self, commands, mode="stdio", host="127.0.0.1", port=2087):
         super().__init__(commands, mode, host, port)
+        self.workspace = ""
+        self.opening_files: dict[Path, str] = {}
 
     async def initialize(self, workspace: str):
         self.workspace = workspace
@@ -18,3 +20,29 @@ class LSPClient(LSPTransport):
     async def exit(self):
         await self.send_notification("exit")
         await self.stop()
+
+    def get_abs_path(self, relative_path):
+        return Path(self.workspace, relative_path)
+
+    async def did_open(self, relative_path: str):
+        path = self.get_abs_path(relative_path)
+
+        content = ""
+        with open(path, encoding="utf-8") as file:
+            content = file.read()
+
+        if path in self.opening_files:
+            raise f"Cannot open same file multiple times: {path}"
+
+        self.opening_files[path] = content
+
+        params = {
+            "textDocument": {
+                "uri": path.as_uri(),
+                "languageId": "cpp",
+                "version": 0,
+                "text": content,
+            }
+        }
+
+        await self.send_notification("textDocument/didOpen", params)
diff --git a/tests/fixtures/transport.py b/tests/fixtures/transport.py
index 934d0662..39cf5b91 100644
--- a/tests/fixtures/transport.py
+++ b/tests/fixtures/transport.py
@@ -11,7 +11,6 @@ class LSPTransport:
         self.mode = mode
         self.host = host
         self.port = port
-        self.workspace = ""
 
         self.process: asyncio.subprocess.Process = None
         self.reader: asyncio.StreamReader = None
diff --git a/tests/integration/test_file_operation.py b/tests/integration/test_file_operation.py
new file mode 100644
index 00000000..4090afc6
--- /dev/null
+++ b/tests/integration/test_file_operation.py
@@ -0,0 +1,17 @@
+import sys
+import pytest
+import asyncio
+from ..fixtures.client import LSPClient
+
+
+@pytest.mark.asyncio
+async def test_did_open(executable, test_data_dir):
+    client = LSPClient([
+        executable, "--mode=pipe"
+    ])
+    await client.start()
+
+    await client.initialize(test_data_dir / "hello_world")
+    await client.did_open("main.cpp")
+    await asyncio.sleep(3)
+    await client.exit()
diff --git a/tests/integration/test_simple.py b/tests/integration/test_lifecycle.py
similarity index 100%
rename from tests/integration/test_simple.py
rename to tests/integration/test_lifecycle.py