How to build and test ExternalProject (Makefile) in cmake?

Question

C++ / C#

Good evening.
My project includes as a module (git submodule) another project. My project uses CMake, the connected project uses Makefile. This Makefile has two targets: all, test. I want to run make test in this module while running CTest on my project. How to do it right?
Something like this now

SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/test_bin)

SET(GTEST_INCLUDE_DIR ${PROJECT_BINARY_DIR}/gtest/src/googletest/googletest/include)
SET(ED25519_PATH "${PROJECT_SOURCE_DIR}/core/vendor/ed25519")


include(ExternalProject)

ExternalProject_Add(
    ed25519
    PREFIX ${CMAKE_CURRENT_BINARY_DIR}/modules
    SOURCE_DIR ${ED25519_PATH}
    BUILD_COMMAND make -f ${ED25519_PATH}/Makefile
    TEST_COMMAND make test -f ${ED25519_PATH}/Makefile
    INSTALL_COMMAND ""
)

But he writes to me

CMake Error: The source directory "somepath/core/vendor/ed25519" does not appear to contain CMakeLists.txt.