starting with component unit testing (running on device)

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

components/logger/CMakeLists.txt

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+idf_component_register(SRCS "logger.c"
+                    INCLUDE_DIRS "include")

components/logger/include/logger.h

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+#pragma once
+
+int add(int a, int b);
+
+void log_message(const char* message);

components/logger/logger.c

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+#include "logger.h"
+
+#include <stdio.h>
+
+int add(int a, int b) {
+  return a + b;
+}
+
+void log_message(const char* message) {
+  printf("%s\n", message);
+}

components/logger/test/CMakeLists.txt

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+idf_component_register(SRC_DIRS "."
+                    INCLUDE_DIRS "."
+                    REQUIRES cmock logger)

components/logger/test/logger_test.c

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+#include "unity.h"
+
+#include "logger.h"
+
+TEST_CASE("Add two numbers", "[logger]") {
+  TEST_ASSERT_EQUAL(3, add(1, 2));
+}