tests: Add helpers.c and helpers.h files

The purpose of helpers.c file is to contain the helper
functions that have been in helpers.function so far and
that are not related to the mechanism of unit test
execution and not related to random number generation
(will be moved in a dedicated file).

The purpose of helpers.h is to contain the interface
exposed by helpers.c thus helper function prototypes.

Make the changes in the build systems (make and cmake)
to build helpers.c and link it to test executables
along with mbedtls library.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

tests/.gitignore

@@ -9,3 +9,6 @@ data_files/ctr_drbg_seed
 data_files/entropy_seed
 
 include/test/instrument_record_status.h
+
+src/*.o
+src/libmbed*

tests/CMakeLists.txt

@@ -46,9 +46,9 @@ function(add_test_suite suite_name)
         DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/scripts/generate_test_code.py mbedtls ${CMAKE_CURRENT_SOURCE_DIR}/suites/helpers.function ${CMAKE_CURRENT_SOURCE_DIR}/suites/main_test.function ${CMAKE_CURRENT_SOURCE_DIR}/suites/host_test.function ${CMAKE_CURRENT_SOURCE_DIR}/suites/test_suite_${suite_name}.function ${CMAKE_CURRENT_SOURCE_DIR}/suites/test_suite_${data_name}.data
     )
 
-    include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
-    add_executable(test_suite_${data_name} test_suite_${data_name}.c)
+    add_executable(test_suite_${data_name} test_suite_${data_name}.c $<TARGET_OBJECTS:mbedtests>)
     target_link_libraries(test_suite_${data_name} ${libs})
+    target_include_directories(test_suite_${data_name} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
     if(${data_name} MATCHES ${SKIP_TEST_SUITES_REGEX})
         message(STATUS "The test suite ${data_name} will not be executed.")
     else()
@@ -66,6 +66,10 @@ if(MSVC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /WX-")
 endif(MSVC)
 
+file(GLOB MBEDTESTS_FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/*.c)
+add_library(mbedtests OBJECT ${MBEDTESTS_FILES})
+target_include_directories(mbedtests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
+
 add_test_suite(aes aes.cbc)
 add_test_suite(aes aes.cfb)
 add_test_suite(aes aes.ecb)

tests/Makefile

@@ -21,9 +21,9 @@ LOCAL_CFLAGS+=$(THIRDPARTY_INCLUDES)
 LOCAL_CFLAGS += -D_POSIX_C_SOURCE=200809L
 
 ifndef SHARED
-DEP=../library/libmbedcrypto.a ../library/libmbedx509.a ../library/libmbedtls.a
+MBEDLIBS=../library/libmbedcrypto.a ../library/libmbedx509.a ../library/libmbedtls.a
 else
-DEP=../library/libmbedcrypto.$(DLEXT) ../library/libmbedx509.$(DLEXT) ../library/libmbedtls.$(DLEXT)
+MBEDLIBS=../library/libmbedcrypto.$(DLEXT) ../library/libmbedx509.$(DLEXT) ../library/libmbedtls.$(DLEXT)
 endif
 
 ifdef DEBUG
@@ -74,9 +74,16 @@ BINARIES := $(addsuffix $(EXEXT),$(APPS))
 
 all: $(BINARIES)
 
-$(DEP):
+$(MBEDLIBS):
 	$(MAKE) -C ../library
 
+MBEDTESTS_OBJS=$(patsubst %.c,%.o,$(wildcard src/*.c))
+
+# Rule to compile common test C files in src folder
+src/%.o : src/%.c
+	echo "  CC    $<"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) -o $@ -c $<
+
 C_FILES := $(addsuffix .c,$(APPS))
 
 # Wildcard target for test code generation:
@@ -105,9 +112,9 @@ C_FILES := $(addsuffix .c,$(APPS))
 		-o .
 
 
-$(BINARIES): %$(EXEXT): %.c $(DEP)
+$(BINARIES): %$(EXEXT): %.c $(MBEDLIBS) $(MBEDTESTS_OBJS)
 	echo "  CC    $<"
-	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $< $(MBEDTESTS_OBJS) $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
 # Some test suites require additional header files.
 $(filter test_suite_psa_crypto%, $(BINARIES)): include/test/psa_crypto_helpers.h
@@ -118,10 +125,13 @@ $(addprefix embedded_,$(filter test_suite_psa_%, $(APPS))): embedded_%: TESTS/mb
 clean:
 ifndef WINDOWS
 	rm -rf $(BINARIES) *.c *.datax TESTS
+	rm -f src/*.o src/libmbed*
 else
 	if exist *.c del /Q /F *.c
 	if exist *.exe del /Q /F *.exe
 	if exist *.datax del /Q /F *.datax
+	if exist src/*.o del /Q /F src/*.o
+	if exist src/libmbed* del /Q /F src/libmed*
 ifneq ($(wildcard TESTS/.*),)
 	rmdir /Q /S TESTS
 endif

tests/include/test/helpers.h

@@ -0,0 +1,35 @@
+/**
+ * \file helpers.h
+ *
+ * \brief   This file contains the prototypes of helper functions for the
+ *          purpose of testing.
+ */
+
+/*  Copyright (C) 2020, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#ifndef TEST_HELPERS_H
+#define TEST_HELPERS_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#endif /* TEST_HELPERS_H */

tests/src/helpers.c

@@ -0,0 +1,19 @@
+/*  Copyright (C) 2020, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#include <test/helpers.h>

tests/suites/helpers.function

@@ -3,6 +3,7 @@
 /* Headers */
 
 #include <test/macros.h>
+#include <test/helpers.h>
 
 #include <stdlib.h>