Add source files.

test/CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+set(EXTRA_COMPONENT_DIRS "$ENV{IDF_PATH}/tools/unit-test-app/components"
+                         "../../relay_chn")
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(relay_chn_test)

test/main/CMakeLists.txt

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+idf_component_register(SRCS_DIRS "."
+                    PRIV_INCLUDE_DIRS "."
+                    PRIV_REQUIRES unity test_utils relay_chn)

test/main/relay_chn_test.c

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+#include "unity.h"
+#include "relay_chn.h"
+
+
+const gpip_num_t gpio_map[] = {GPIO_NUM_4, GPIO_NUM_5, GPIO_NUM_18, GPIO_NUM_19};
+const uint8_t gpio_count = sizeof(gpio_map) / sizeof(gpio_map[0]);
+const uint8_t relay_chn_count = gpio_count / 2;
+
+TEST_CASE("relay chn inits correctly", "[relay_chn]")
+{
+    TEST_ESP_OK(relay_chn_create(gpio_map, gpio_count));
+}
+
+TEST_CASE("Relay channels run forward and update state", "[relay_chn][forward]")
+{
+    TEST_ESP_OK(relay_chn_create(gpio_map, gpio_count));
+    // Test forward run on all channels
+    for (uint8_t i = 0; i < relay_chn_count; i++) {
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+        relay_chn_run_forward(i); // Run the channel forward
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_FORWARD, relay_chn_get_state(i));
+        relay_chn_stop(i); // Stop the channel
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+        
+        relay_chn_flip_direction(i); // Flip the direction
+        TEST_ASSERT_EQUAL(RELAY_CHN_DIRECTION_FLIPPED, relay_chn_get_direction(i));
+        relay_chn_run_forward(i); // Run the channel forward
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_FORWARD, relay_chn_get_state(i));
+        relay_chn_stop(i); // Stop the channel
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+    }
+}
+
+TEST_CASE("Relay channels run reverse and update state", "[relay_chn][reverse]")
+{
+    TEST_ESP_OK(relay_chn_create(gpio_map, gpio_count));
+    // Test reverse run on all channels
+    for (uint8_t i = 0; i < relay_chn_count; i++) {
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+        relay_chn_run_reverse(i); // Run the channel reverse
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_REVERSE, relay_chn_get_state(i));
+        relay_chn_stop(i); // Stop the channel
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+        
+        relay_chn_flip_direction(i); // Flip the direction
+        TEST_ASSERT_EQUAL(RELAY_CHN_DIRECTION_FLIPPED, relay_chn_get_direction(i));
+        relay_chn_run_reverse(i); // Run the channel forward
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_REVERSE, relay_chn_get_state(i));
+        relay_chn_stop(i); // Stop the channel
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+    }
+}
+
+static void check_channels_state_unchanged(void)
+{
+    for (uint8_t i = 0; i < relay_chn_count; i++) {
+        TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(i));
+        TEST_ASSERT_EQUAL(RELAY_CHN_DIRECTION_DEFAULT, relay_chn_get_direction(i));
+    }
+}
+
+TEST_CASE("Relay channels do not change state for invalid channel", "[relay_chn][invalid]")
+{
+    TEST_ESP_OK(relay_chn_create(gpio_map, gpio_count));
+    // Test invalid channel run
+    relay_chn_run_forward(relay_chn_count + 1); // Run the channel forward
+    check_channels_state_unchanged();
+    relay_chn_run_reverse(relay_chn_count + 1); // Run the channel reverse
+    check_channels_state_unchanged();
+    relay_chn_stop(relay_chn_count + 1); // Stop the channel
+    TEST_ASSERT_EQUAL(RELAY_CHN_STATE_STOPPED, relay_chn_get_state(relay_chn_count + 1));
+    check_channels_state_unchanged();
+    relay_chn_flip_direction(relay_chn_count + 1); // Flip the direction
+    check_channels_state_unchanged();
+}

test/main/relay_chn_test_main.c

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+#include <stdio.h>
+#include <string.h>
+#include "unity.h"
+#include "unity_test_runner.h"
+
+
+static void print_banner(const char*);
+
+void app_main(void) {
+
+    print_banner("Starting interactive test menu");
+    /* This function will not return, and will be busy waiting for UART input.
+     * Make sure that task watchdog is disabled if you use this function.
+     */
+    unity_run_menu();
+}
+
+static void print_banner(const char* text)
+{
+    printf("\n##### %s #####\n\n", text);
+}

test/sdkconfig.defaults

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+# For IDF 5.0
+CONFIG_ESP_TASK_WDT_EN=n
+
+# For IDF4.4
+CONFIG_ESP_TASK_WDT=n