[A] Add test for add_subdirectory

tests/add_subdirectory_tests/CMakeLists.txt

@@ -0,0 +1,43 @@
+cmake_minimum_required(VERSION 3.0)
+
+project(foo)
+
+add_subdirectory(libfort)
+
+# Create target that depend on libfort and check they'll compile ok
+add_executable(foo-app
+    foo-app.cpp)
+target_link_libraries(foo-app
+	PRIVATE fort
+)
+
+add_library(foo-lib
+	foo-lib.cpp)
+target_link_libraries(foo-lib
+	PRIVATE fort)
+
+add_library(foo-lib-shared SHARED
+	foo-lib.cpp)
+target_link_libraries(foo-lib-shared
+	PRIVATE fort)
+
+include(GNUInstallDirs)
+install(
+	TARGETS foo-lib foo-lib-shared
+	EXPORT ${PROJECT_NAME}-targets
+	INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+
+
+include(CMakePackageConfigHelpers)
+
+install(
+	EXPORT ${PROJECT_NAME}-targets
+	FILE ${PROJECT_NAME}-targets.cmake
+	NAMESPACE ${PROJECT_NAME}::
+	DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)
+

tests/add_subdirectory_tests/foo-app.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+
+#include "fort.hpp"
+
+
+int main()
+{
+    fort::char_table table;
+    table << fort::header
+        << "N" << "Driver" << "Time" << "Avg Speed" << fort::endr
+        << "1" << "Ricciardo" << "1:25.945" << "47.362" << fort::endr
+        << "2" << "Hamilton" << "1:26.373" << "35.02" << fort::endr
+        << "3" << "Verstappen" << "1:26.469" << "29.78" << fort::endr;
+
+    std::cout << table.to_string() << std::endl;
+}

tests/add_subdirectory_tests/foo-lib.cpp

@@ -0,0 +1,13 @@
+#include "fort.hpp"
+
+std::string print_string()
+{
+    fort::char_table table;
+    table << fort::header
+        << "N" << "Driver" << "Time" << "Avg Speed" << fort::endr
+        << "1" << "Ricciardo" << "1:25.945" << "47.362" << fort::endr
+        << "2" << "Hamilton" << "1:26.373" << "35.02" << fort::endr
+        << "3" << "Verstappen" << "1:26.469" << "29.78" << fort::endr;
+
+    return table.to_string();
+}