e Add CMake options for use with add_subdirectory() to help with #69

Now most of our tests are not executed if this projected has
been added inside another one.

CMakeLists.txt

@@ -13,15 +13,27 @@ add_subdirectory(ApprovalTests)
 set(CMAKE_VERBOSE_MAKEFILE off)
 
 option(APPROVAL_TESTS_ENABLE_CODE_COVERAGE "Enable coverage reporting for selected tests" OFF)
+
+# TODO Rename s/ENABLE/BUILD/
+# TODO Make this also work if not a subproject
 option(APPROVAL_TESTS_ENABLE_CMAKE_INTEGRATION_TESTS "Enable tests that check our CMake integration" ON)
 
+option(APPROVAL_TESTS_BUILD_THIRD_PARTY
+        "Include third_party directory. Note that these are always included if this is the top-level project"
+        OFF)
+option(APPROVAL_TESTS_BUILD_TESTING
+        "Build self-tests. Note that these are always built if this is the top-level project"
+        OFF)
+option(APPROVAL_TESTS_BUILD_EXAMPLES
+        "Build documentation examples. Note that these are always built if this is the top-level project"
+        OFF)
+
 if(APPROVAL_TESTS_ENABLE_CODE_COVERAGE)
-    message(STATUS "Enable Code Coverage")
     include(CodeCoverage)
     append_coverage_compiler_flags()
 endif()
 
-if (NOT_SUBPROJECT)
+if (NOT_SUBPROJECT OR APPROVAL_TESTS_BUILD_THIRD_PARTY)
     # Download and unpack googletest at configure time
     configure_file(CMakeLists.txt.in googletest-download/CMakeLists.txt)
     execute_process(COMMAND "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" .
@@ -39,9 +51,18 @@ if (NOT_SUBPROJECT)
     add_subdirectory("${CMAKE_BINARY_DIR}/googletest-src"
                      "${CMAKE_BINARY_DIR}/googletest-build")
 
-    enable_testing()
     add_subdirectory(third_party)
+endif()
+
+if(NOT_SUBPROJECT OR APPROVAL_TESTS_BUILD_TESTING OR APPROVAL_TESTS_BUILD_EXAMPLES)
+    enable_testing()
+endif()
+
+if(NOT_SUBPROJECT OR APPROVAL_TESTS_BUILD_TESTING)
     add_subdirectory(tests)
+endif()
+
+if(NOT_SUBPROJECT OR APPROVAL_TESTS_BUILD_EXAMPLES)
     add_subdirectory(examples)
 endif()
 
@@ -54,3 +75,7 @@ message("CMAKE_CXX_COMPILER = ${CMAKE_CXX_COMPILER}")
 message("CMAKE_CXX_COMPILER_ID = ${CMAKE_CXX_COMPILER_ID}")
 message("CMAKE_CXX_COMPILER_VERSION = ${CMAKE_CXX_COMPILER_VERSION}")
 message("CMAKE_UNITY_BUILD = ${CMAKE_UNITY_BUILD}")
+#message("APPROVAL_TESTS_ENABLE_CMAKE_INTEGRATION_TESTS = ${APPROVAL_TESTS_ENABLE_CMAKE_INTEGRATION_TESTS}")
+#message("APPROVAL_TESTS_BUILD_THIRD_PARTY = ${APPROVAL_TESTS_BUILD_THIRD_PARTY}")
+#message("APPROVAL_TESTS_BUILD_TESTING = ${APPROVAL_TESTS_BUILD_TESTING}")
+#message("APPROVAL_TESTS_BUILD_EXAMPLES = ${APPROVAL_TESTS_BUILD_EXAMPLES}")