starting with component unit testing (running on device)

Signed-off-by: Peter Siegmund <developer@mars3142.org>

test/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "components_test.c"
+                    INCLUDE_DIRS ".")

test/main/components_test.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <string.h>
+#include "unity.h"
+
+static void print_banner(const char* text);
+
+void app_main(void) {
+  print_banner("Running all the registered tests");
+  UNITY_BEGIN();
+  unity_run_all_tests();
+  UNITY_END();
+}
+
+static void print_banner(const char* text) {
+  printf("\n#### %s #####\n\n", text);
+}