Break down tests into categories.

Break down tests into categories to improve maintainability and test granularity. This makes it easier to execute unit tests in CI/CD pipelines.

Closes #1054.

test_apps/main/test_app_main.c

@@ -0,0 +1,47 @@
+
+#include "esp_log.h"
+#include "esp_system.h"
+#include "test_common.h"
+#include "unity.h"
+#include "unity_internals.h"
+#include "unity_test_runner.h"
+#include <stdbool.h>
+
+
+#ifndef RELAY_CHN_UNITY_TEST_GROUP_TAG
+#warning "RELAY_CHN_UNITY_TEST_GROUP_TAG is not defined, using default 'relay_chn'"
+#define RELAY_CHN_UNITY_TEST_GROUP_TAG "relay_chn"
+#endif
+
+void setUp() 
+{
+    g_is_component_initialized = false;
+}
+
+void tearDown()
+{
+    // Clean up after each test
+    if (g_is_component_initialized) {
+        relay_chn_destroy();
+        g_is_component_initialized = false;
+    }
+}
+
+void app_main(void) 
+{
+    UNITY_BEGIN();
+
+    // Log general test information
+    ESP_LOGI(TEST_TAG, "Available test count: %d", unity_get_test_count());
+    ESP_LOGI(TEST_TAG, "Running tests for tag: %s", RELAY_CHN_UNITY_TEST_GROUP_TAG);
+
+    if (strncmp(RELAY_CHN_UNITY_TEST_GROUP_TAG, "all", strlen("all")) == 0) {
+        unity_run_all_tests();
+    }
+    else {
+        unity_run_tests_by_tag(RELAY_CHN_UNITY_TEST_GROUP_TAG, false);
+    }
+
+    UNITY_END();
+    ESP_LOGI(TEST_TAG, "All tests complete.");
+}