CMake: add lib skeleton and google-tests

.gitignore

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+# ignore checkout dir for Google Tests
+google-tests/lib
+/.idea
+/build

CMakeLists.txt

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+cmake_minimum_required(VERSION 4.1)
+
+project(PasadaSuperProject)
+
+option(PASADA_BUILD_TESTS "Build Google Tests" ON)
+
+add_subdirectory(pasada-lib)
+
+if(PASADA_BUILD_TESTS)
+    enable_testing()
+    add_subdirectory(google-tests)
+endif()

google-tests/CMakeLists.txt

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+project(Google_Tests)
+
+set(CMAKE_CXX_STANDARD 20)
+
+# 'lib' is the folder with Google Test sources
+add_subdirectory(lib)
+include_directories(${gtest_SOURCE_DIR}/include ${gtest_SOURCE_DIR})
+
+# 'Google_Tests_run' is the target name
+# 'test1.cpp test2.cpp' are source files with tests
+add_executable(Google_Tests_run test1.cpp)
+
+target_link_libraries(Google_Tests_run pasada)
+#target_include_directories(Google_Tests_run PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/pasada-lib/include")
+
+target_link_libraries(Google_Tests_run gtest gtest_main)
+#target_link_libraries(Google_Tests_run PRIVATE Pasada_Lib)
+
+target_include_directories(Google_Tests_run PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../pasada-lib/include")

google-tests/test1.cpp

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+//
+// Created by david on 28.02.2026.
+//
+#include <gtest/gtest.h>
+#include "library.h"
+
+// Demonstrate some basic assertions.
+TEST(HelloTest, BasicAssertions) {
+    // Expect two strings not to be equal.
+    EXPECT_STRNE("hello", "world from test1.cpp");
+    // Expect equality.
+    EXPECT_EQ(7 * 6, 42);
+    printf("asdf");
+    hello();
+}

pasada-lib/CMakeLists.txt

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+project(Pasada_Lib)
+
+SET(PASADA_SRC
+        library.cpp
+)
+
+if(PASADA_BUILD_TESTS)
+    # must build a STATIC library for google-tests to successfully consume us
+    # (otherwise, strange runtime errors ensue when trying to call into the lib)
+    add_library(pasada STATIC
+            ${PASADA_SRC}
+    )
+else()
+    add_library(pasada SHARED
+            ${PASADA_SRC}
+    )
+endif()
+
+target_include_directories(pasada
+        PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+set(CMAKE_CXX_STANDARD 20)

pasada-lib/include/library.h

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+#ifndef LIBPASADA_LIBRARY_H
+#define LIBPASADA_LIBRARY_H
+
+void hello();
+
+#endif // LIBPASADA_LIBRARY_H

pasada-lib/library.cpp

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+#include "library.h"
+
+#include <iostream>
+
+void hello() {
+    std::cout << "Hello, World!" << std::endl;
+}