From df7267e5df9062ae37c6577affd9424c715f5817 Mon Sep 17 00:00:00 2001
From: Andrey Derzhavin <derzhavin.andrej@yandex.ru>
Date: Mon, 17 Mar 2025 21:19:08 +0300
Subject: [PATCH] [infra] Support unit-testing via GTest

Closes #10
---
 .github/workflows/hsim.yml     |  2 +-
 CMakeLists.txt                 |  3 +++
 test/CMakeLists.txt            |  1 +
 test/unit/CMakeLists.txt       | 20 ++++++++++++++++++++
 test/unit/hello/CMakeLists.txt |  1 +
 test/unit/hello/hello.cc       |  3 +++
 third_party/CMakeLists.txt     | 14 ++++++++++++++
 7 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 test/CMakeLists.txt
 create mode 100644 test/unit/CMakeLists.txt
 create mode 100644 test/unit/hello/CMakeLists.txt
 create mode 100644 test/unit/hello/hello.cc

diff --git a/.github/workflows/hsim.yml b/.github/workflows/hsim.yml
index 7e7bb1d..264ec60 100644
--- a/.github/workflows/hsim.yml
+++ b/.github/workflows/hsim.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        path: ['src', 'include']
+        path: ['src', 'include', 'test']
     steps:
       - name: Checkout repo and submodules
         uses: actions/checkout@v4
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3434e5f..fb9dd61 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,3 +28,6 @@ add_executable(${PROJECT_NAME} src/main.cc)
 target_compile_options(${PROJECT_NAME} PRIVATE -Wpedantic)
 target_link_libraries(${PROJECT_NAME} PRIVATE hSim-lib CLI11::CLI11 fmt::fmt)
 set_target_properties(${PROJECT_NAME} PROPERTIES OUTPUT_NAME hsim)
+
+enable_testing()
+add_subdirectory(test)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..269aea0
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory(unit)
diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
new file mode 100644
index 0000000..8bd1cf0
--- /dev/null
+++ b/test/unit/CMakeLists.txt
@@ -0,0 +1,20 @@
+include(GoogleTest)
+
+# Helpful macro to add unittest
+# Accepts src_file (with utest) as mandatory argument
+# and list of linked libraries after it
+macro(hsim_add_utest src_file)
+  set(TEST_NAME "${src_file}_test")
+  add_executable(${TEST_NAME} ${src_file})
+
+  target_link_libraries(${TEST_NAME} PRIVATE GTest::gtest_main hSIM::defaults)
+  foreach(arg IN LISTS ARGN)
+    target_link_libraries(${TEST_NAME} PRIVATE ${arg})
+  endforeach()
+  gtest_discover_tests(
+    ${TEST_NAME}
+    EXTRA_ARGS --gtest_color=yes
+    PROPERTIES LABELS unit)
+endmacro()
+
+add_subdirectory(hello)
diff --git a/test/unit/hello/CMakeLists.txt b/test/unit/hello/CMakeLists.txt
new file mode 100644
index 0000000..530a80f
--- /dev/null
+++ b/test/unit/hello/CMakeLists.txt
@@ -0,0 +1 @@
+hsim_add_utest(hello.cc)
diff --git a/test/unit/hello/hello.cc b/test/unit/hello/hello.cc
new file mode 100644
index 0000000..36886cc
--- /dev/null
+++ b/test/unit/hello/hello.cc
@@ -0,0 +1,3 @@
+#include <gtest/gtest.h>
+
+TEST(Simple, Hello) { ASSERT_TRUE(true); }
diff --git a/third_party/CMakeLists.txt b/third_party/CMakeLists.txt
index e6b7ef9..9f4bfa4 100644
--- a/third_party/CMakeLists.txt
+++ b/third_party/CMakeLists.txt
@@ -21,3 +21,17 @@ CPMAddPackage(
   GIT_TAG Release_3.12
   EXCLUDE_FROM_ALL True
   SYSTEM True)
+
+
+# gtest
+CPMAddPackage(
+  NAME
+  googletest
+  GITHUB_REPOSITORY
+  google/googletest
+  VERSION
+  1.16.0
+  OPTIONS
+  "INSTALL_GTEST OFF"
+  EXCLUDE_FROM_ALL True
+  SYSTEM True)