From 287ade1d321c983ddd00025864f9ea59d31c4493 Mon Sep 17 00:00:00 2001
From: Loek Le Blansch <loek@pipeframe.xyz>
Date: Tue, 3 Sep 2024 19:51:41 +0200
Subject: add googletest unit testing setup

---
 .gitmodules         |  5 +++++
 contributing.md     |  9 +++++++++
 lib/googletest      |  1 +
 src/CMakeLists.txt  |  2 +-
 test/CMakeLists.txt | 21 +++++++++++++++++++++
 test/dummy.cpp      |  6 ++++++
 test/makefile       |  7 +++++++
 7 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 .gitmodules
 create mode 160000 lib/googletest
 create mode 100644 test/CMakeLists.txt
 create mode 100644 test/dummy.cpp
 create mode 100644 test/makefile

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f8a9861
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,5 @@
+[submodule "lib/googletest"]
+	path = lib/googletest
+	url = https://github.com/google/googletest
+	branch = v1.15.x
+	shallow = true
diff --git a/contributing.md b/contributing.md
index c018917..f8c7d97 100644
--- a/contributing.md
+++ b/contributing.md
@@ -17,6 +17,13 @@
   sure to separate the include statements using a blank line (clang-format may
   sort include statements, but does not sort across empty lines).
 
+## CMakeLists specific
+
+- Make sure list arguments (e.g. sources, libraries) given to commands (e.g.
+  `target_sources`, `target_link_libraries`) are on separate lines. This makes
+  resolving merge conflicts when multiple sources were added by different
+  people to the same CMakeLists.txt easier.
+
 # Documentation
 
 - All documentation is written in U.S. English
@@ -26,4 +33,6 @@
 
 - External libraries should be included as Git submodules under the `lib/`
   subdirectory
+- When adding new submodules, make sure to manually set the `branch` and
+  `shallow` options in the [.gitmodules](./.gitmodules) file
 
diff --git a/lib/googletest b/lib/googletest
new file mode 160000
index 0000000..b514bdc
--- /dev/null
+++ b/lib/googletest
@@ -0,0 +1 @@
+Subproject commit b514bdc898e2951020cbdca1304b75f5950d1f59
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3ade1e3..0090188 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.28)
 
 set(CMAKE_C_STANDARD 11)
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 
 # enable debug features
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..26aa460
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.28)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
+
+set(CMAKE_BUILD_TYPE Debug)
+
+project(test C CXX)
+
+add_subdirectory(../lib/googletest googletest)
+
+add_executable(test
+	dummy.cpp
+)
+
+target_link_libraries(test
+	gtest_main
+	# TODO: add crepe engine
+)
+
diff --git a/test/dummy.cpp b/test/dummy.cpp
new file mode 100644
index 0000000..08850b2
--- /dev/null
+++ b/test/dummy.cpp
@@ -0,0 +1,6 @@
+#include <gtest/gtest.h>
+
+TEST(dummy, foo) {
+	ASSERT_TRUE(1);
+}
+
diff --git a/test/makefile b/test/makefile
new file mode 100644
index 0000000..7aeee34
--- /dev/null
+++ b/test/makefile
@@ -0,0 +1,7 @@
+TARGET = $(BUILD_DIR)/test
+
+include ../lazy.mk
+
+test: $(TARGET) FORCE
+	$(TARGET)
+
-- 
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