CMake: Move mbedtls stubs to the mbedtls dir

Move the connectivity mbedtls stubs into the connectivity/mbedtls
component directory. So we can avoid duplicating the mbed-os source
tree in a central UNITTESTS folder.
Made a copy of mbedtls_stub.c and add it into mbed-stubs-mbedtls as
previously this file gets referred from
connectivity/nanostack/coap-service/test/coap-service/unittest/stub/mbedtls_stub.c
and problem is nanostack unit test is not maintained as part of mbed os unit tests.

Author: rajkan01

UNITTESTS/stubs/connectivity/CMakeLists.txt

@@ -18,12 +18,8 @@ target_compile_definitions(mbed-stubs-connectivity
 
 target_sources(mbed-stubs-connectivity
     PRIVATE
-        aes_stub.c
-        cipher_stub.c
-        cmac_stub.c
         ip4tos_stub.c
         stoip4_stub.c
-        ${mbed-os_SOURCE_DIR}/connectivity/nanostack/coap-service/test/coap-service/unittest/stub/mbedtls_stub.c
 )
 
 target_link_libraries(mbed-stubs-connectivity

connectivity/CMakeLists.txt

@@ -41,4 +41,5 @@ else()
     add_subdirectory(cellular)
     add_subdirectory(lorawan)
     add_subdirectory(netsocket)
+    add_subdirectory(mbedtls)
 endif()

connectivity/lorawan/tests/UNITTESTS/features/lorawan/loramaccrypto/CMakeLists.txt

@@ -22,6 +22,7 @@ target_link_libraries(${TEST_NAME}
         mbed-headers-lorawan
         mbed-stubs
         mbed-stubs-headers
+        mbed-stubs-mbedtls
         gmock_main
 )
 

connectivity/mbedtls/CMakeLists.txt

@@ -1,6 +1,10 @@
 # Copyright (c) 2020 ARM Limited. All rights reserved.
 # SPDX-License-Identifier: Apache-2.0
 
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME AND BUILD_TESTING)
+    add_subdirectory(tests/UNITTESTS)
+endif()
+
 target_include_directories(mbed-mbedtls
     INTERFACE
         .

connectivity/mbedtls/tests/UNITTESTS/.mbedignore

@@ -0,0 +1 @@
+*

connectivity/mbedtls/tests/UNITTESTS/CMakeLists.txt

@@ -0,0 +1,3 @@
+# Copyright (c) 2021 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+add_subdirectory(doubles)

connectivity/mbedtls/tests/UNITTESTS/doubles/CMakeLists.txt

@@ -0,0 +1,21 @@
+# Copyright (c) 2021 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+add_library(mbed-stubs-mbedtls)
+
+target_sources(mbed-stubs-mbedtls
+    PRIVATE
+        aes_stub.c
+        cipher_stub.c
+        cmac_stub.c
+        mbedtls_stub.c
+)
+
+target_link_libraries(mbed-stubs-mbedtls
+    PRIVATE
+        mbed-stubs-rtos-headers
+        mbed-headers
+        mbed-stubs-headers
+        mbed-stubs-rtos
+        gtest
+)