tests: Add one dummy test

...so that cmake has something to build.

Change-Id: I0b1747b51a3a000695ccf5769676035c696e24c5
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 52a3cdf..76f07e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,6 +70,7 @@
         target_include_directories(test_${fname} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
         target_link_libraries(test_${fname} TestCatchIntegration)
     endmacro()
+    cli_test(dummy)
 endif()
 
 if(WITH_DOCS)