Add CMakeLists file for tests

tests/CMakeLists.txt

@@ -0,0 +1,83 @@
+cmake_minimum_required(VERSION 3.14)
+
+# Suppress warning msgs
+cmake_policy(SET CMP0135 NEW)
+
+project(octptests)
+
+# TRUE if tests are run as part of GitHub Actions workflow, FALSE otherwise
+set (TEST_IN_GITHUB_ACTIONS FALSE)
+
+# GoogleTest requires at least C++14
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include(FetchContent)
+
+# Fetch and download Google Test
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/b796f7d44681514f58a683a3a71ff17c94edb0c1.zip
+)
+# Windows: Prevent overriding the parent project's compiler/linker settings
+# Currently no parent CMake project, but good to keep for the future
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+#Enable testing in CMake
+enable_testing()
+
+# Create an executable for the tests
+add_executable(
+    testoctp
+    testoctp.cpp
+)
+
+# link the googletest library to the tests
+target_link_libraries(
+    testoctp
+    GTest::gtest_main
+)
+
+# Enable CMake’s test runner to discover the tests included in the binary,
+# using the GoogleTest CMake module.
+include(GoogleTest)
+gtest_discover_tests(testoctp)
+
+
+if (TEST_IN_GITHUB_ACTIONS)
+  # lammps was previously downloaded and built as part of the workflow
+  set (LAMMPS_SOURCE_DIR "${CMAKE_SOURCE_DIR}/../../lammps/src/")
+else()
+  message(STATUS "Downloading LAMMPS")
+  # download lammps
+  FetchContent_Declare(
+    lammps
+    URL https://github.com/lammps/lammps/archive/refs/tags/stable_23Jun2022_update4.zip
+  )
+  FetchContent_Populate(lammps)
+  set (LAMMPS_SOURCE_DIR "${lammps_SOURCE_DIR}/src/")
+  # copy octp files to lammps dir
+  file(GLOB filesToCopy "${CMAKE_SOURCE_DIR}/../src/*")
+  file(COPY ${filesToCopy} DESTINATION ${LAMMPS_SOURCE_DIR})
+  # build lammps+octp as a post-build event of the testoctp
+  add_custom_command(
+    TARGET testoctp POST_BUILD 
+    COMMAND cd ${LAMMPS_SOURCE_DIR} &&
+      make yes-asphere &&
+      make yes-body &&
+      make yes-class2 &&
+      make yes-dipole &&
+      make yes-granular &&
+      make yes-kspace &&
+      make yes-manybody &&
+      make yes-molecule &&
+      make yes-rigid &&
+      make yes-shock &&
+      make -j 8 mpi
+    WORKING_DIRECTORY ${lammps_SOURCE_DIR}
+    VERBATIM
+    COMMENT "Build LAMMPS with OCTP plugin"
+  )
+endif()
+

tests/testoctp.cpp

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+#include <gtest/gtest.h>
+
+class OctpTest : public testing::Test {};
+
+TEST_F(OctpTest, DummyTest) {
+    EXPECT_TRUE(true);
+}