diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 15773d8..5b54873 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: Apache-2.0
+
 include(FetchContent)
 FetchContent_Declare(
   googletest
@@ -8,4 +10,11 @@ FetchContent_Declare(
 FetchContent_MakeAvailable(googletest)
 
 add_library(libbtop_test INTERFACE)
+target_include_directories(libbtop_test INTERFACE ${PROJECT_SOURCE_DIR}/src)
 target_link_libraries(libbtop_test INTERFACE libbtop GTest::gtest_main)
+
+add_executable(btop_test tools.cpp)
+target_link_libraries(btop_test libbtop_test)
+
+include(GoogleTest)
+gtest_discover_tests(btop_test)
diff --git a/tests/tools.cpp b/tests/tools.cpp
new file mode 100644
index 0000000..978ed74
--- /dev/null
+++ b/tests/tools.cpp
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include <vector>
+
+#include <gtest/gtest.h>
+
+#include "btop_tools.hpp"
+
+TEST(tools, string_split) {
+	EXPECT_EQ(Tools::ssplit(""), std::vector<std::string> {});
+	EXPECT_EQ(Tools::ssplit("foo"), std::vector<std::string> { "foo" });
+	{
+		auto actual = Tools::ssplit("foo       bar         baz    ");
+		auto expected = std::vector<std::string> { "foo", "bar", "baz" };
+		EXPECT_EQ(actual, expected);
+	}
+
+	{
+		auto actual = Tools::ssplit("foobo  oho  barbo  bo  bazbo", 'o');
+		auto expected = std::vector<std::string> { "f", "b", "  ", "h", "  barb", "  b", "  bazb" };
+		EXPECT_EQ(actual, expected);
+	}
+}