Add test_generation.py dependency in builds

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 776d955..57cf977 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -63,6 +63,7 @@
         DEPENDS
             ${CMAKE_CURRENT_SOURCE_DIR}/../tests/scripts/generate_bignum_tests.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/test_case.py
+            ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/test_generation.py
     )
     add_custom_command(
         OUTPUT
@@ -79,6 +80,7 @@
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/macro_collector.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/psa_storage.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/test_case.py
+            ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/test_generation.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/psa/crypto_config.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/psa/crypto_values.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/psa/crypto_extra.h