From bba4c64a81effa204cf2d23a7416317196a86c63 Mon Sep 17 00:00:00 2001
From: Stardust0831 <169599847+Stardust0831@users.noreply.github.com>
Date: Wed, 19 Aug 2026 02:16:32 +0800
Subject: [PATCH] CMake: build serial unit tests without MPI

---
 source/source_basis/module_pw/CMakeLists.txt | 2 +-
 source/source_cell/CMakeLists.txt            | 2 +-
 source/source_cell/test/CMakeLists.txt       | 4 ++++
 source/source_io/CMakeLists.txt              | 2 +-
 4 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/source/source_basis/module_pw/CMakeLists.txt b/source/source_basis/module_pw/CMakeLists.txt
index 41efac3a0e..ebb9f8673a 100644
--- a/source/source_basis/module_pw/CMakeLists.txt
+++ b/source/source_basis/module_pw/CMakeLists.txt
@@ -54,9 +54,9 @@ if(ENABLE_COVERAGE)
 endif()
 
 if(BUILD_TESTING)
+  add_subdirectory(test_serial)
   if(ENABLE_MPI)
     add_subdirectory(test)
-    add_subdirectory(test_serial)
     add_subdirectory(kernels/test)
     add_subdirectory(test_gpu)
   endif()
diff --git a/source/source_cell/CMakeLists.txt b/source/source_cell/CMakeLists.txt
index 202a29734f..5c687e778f 100644
--- a/source/source_cell/CMakeLists.txt
+++ b/source/source_cell/CMakeLists.txt
@@ -50,8 +50,8 @@ if(ENABLE_COVERAGE)
 endif()
 
 if(BUILD_TESTING)
+  add_subdirectory(test)
   if(ENABLE_MPI)
-    add_subdirectory(test)
     add_subdirectory(test_pw)
   endif()
 endif()
diff --git a/source/source_cell/test/CMakeLists.txt b/source/source_cell/test/CMakeLists.txt
index 8e845dd882..60a5b5f1a1 100644
--- a/source/source_cell/test/CMakeLists.txt
+++ b/source/source_cell/test/CMakeLists.txt
@@ -51,6 +51,10 @@ list(APPEND cell_simple_srcs
 
 add_library(cell_info OBJECT ${cell_simple_srcs})
 
+if(NOT ENABLE_MPI)
+  return()
+endif()
+
 AddTest(
   TARGET MODULE_CELL_read_pp
   LIBS base device
diff --git a/source/source_io/CMakeLists.txt b/source/source_io/CMakeLists.txt
index ae4435cd97..f215d68ff6 100644
--- a/source/source_io/CMakeLists.txt
+++ b/source/source_io/CMakeLists.txt
@@ -140,9 +140,9 @@ endif()
 
 if(BUILD_TESTING)
   add_subdirectory(module_parameter/test)
+  add_subdirectory(test_serial)
   if(ENABLE_MPI)
     add_subdirectory(test)
-    add_subdirectory(test_serial)
   endif()
 endif()