Consolidate unittests in one binary
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4fc7352..9ff3544 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,6 +68,8 @@
 target_link_libraries(mock_nxt nxt gtest)
 SetCXX14(mock_nxt)
 
+set(SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
+
 add_subdirectory(src/backend)
 add_subdirectory(src/wire)
 add_subdirectory(src/tests)