On branch aht20_update

 added unit test

 Changes to be committed:
	new file:   test_app/CMakeLists.txt
	new file:   test_app/main/CMakeLists.txt
	new file:   test_app/main/aht20_test_app.c
	new file:   test_app/main/idf_component.yml

Author: jeetrohan

components/sensors/humiture/aht20/test_app/CMakeLists.txt

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+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+set(COMPONENTS main)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(aht20_test_app)

components/sensors/humiture/aht20/test_app/main/CMakeLists.txt

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+idf_component_register(SRCS "aht20_test_app.c"
+                    INCLUDE_DIRS "."
+                    PRIV_REQUIRES unity aht20)
+
+

components/sensors/humiture/aht20/test_app/main/aht20_test_app.c

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+/*
+ * @File: aht20_test_app.c
+ *
+ * @brief: AHT20 driver unity test app
+ *
+ * @Date: April 20, 2025
+ *
+ * Copyright 2025 Rohan Jeet <jeetrohan92@gmail.com>
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "unity.h"
+#include "esp_system.h"
+#include "aht20.h"
+
+
+// I2C config
+#define I2C_MASTER_SCL_IO       22
+#define I2C_MASTER_SDA_IO       21
+#define I2C_MASTER_NUM          I2C_NUM_0
+#define I2C_MASTER_FREQ_HZ      400000
+
+// Global handles
+i2c_master_bus_handle_t my_i2c_bus_handle = NULL;
+aht20_handle_t aht20_handle = NULL;
+
+void i2c_master_init(void)
+{
+    i2c_master_bus_config_t i2c_mst_config = {
+        .clk_source = I2C_CLK_SRC_DEFAULT,
+        .i2c_port = I2C_MASTER_NUM,
+        .scl_io_num = I2C_MASTER_SCL_IO,
+        .sda_io_num = I2C_MASTER_SDA_IO,
+        .glitch_ignore_cnt = 7,
+        .flags.enable_internal_pullup = true,
+    };
+
+    printf("Requesting I2C bus handle\n");
+    ESP_ERROR_CHECK(i2c_new_master_bus(&i2c_mst_config, &my_i2c_bus_handle));
+    printf("I2C bus handle acquired\n");
+}
+
+void aht20_init_test()
+{
+    i2c_master_init();
+    aht20_handle = aht20_create(my_i2c_bus_handle, AHT20_ADDRESS_LOW);
+
+    printf("Initializing AHT20 sensor\n");
+    while (aht20_init(aht20_handle) != ESP_OK) {
+        vTaskDelay(100 / portTICK_PERIOD_MS);
+    }
+    printf("AHT20 initialized\n");
+}
+
+void aht20_deinit_test(void)
+{
+    aht20_remove(&aht20_handle);
+}
+
+void aht20_read_test(void)
+{
+    vTaskDelay(400 / portTICK_PERIOD_MS);
+
+    for (int i = 0; i < 5; i++) {
+        if (aht20_read_humiture(aht20_handle) == ESP_OK) {
+            printf("Temperature = %.2f°C, Humidity = %.3f%%\n",
+                   aht20_handle->humiture.temperature,
+                   aht20_handle->humiture.humidity);
+        } else {
+            printf("Failed to read data from AHT20 sensor\n");
+        }
+        vTaskDelay(1000 / portTICK_PERIOD_MS);
+    }
+}
+
+
+TEST_CASE("AHT20 Init", "[aht20][init]")
+{
+    TEST_ASSERT_NULL(aht20_handle);
+    aht20_init_test();
+}
+
+TEST_CASE("AHT20 Read", "[aht20][read]")
+{
+    TEST_ASSERT_NOT_NULL(aht20_handle);
+
+    aht20_read_test();
+}
+
+TEST_CASE("AHT20 Deinit", "[aht20][deinit]")
+{
+    TEST_ASSERT_NOT_NULL(aht20_handle);
+
+    aht20_deinit_test();
+    TEST_ASSERT_NULL(aht20_handle);
+
+    printf("AHT20 deinitialized\n");
+}
+
+void app_main(void)
+{
+    printf("\n=== AHT20 Sensor Test Menu ===\n");
+    unity_run_menu();  // Run test selection menu in flash monitor
+}

components/sensors/humiture/aht20/test_app/main/idf_component.yml

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+dependencies:
+  aht20:
+    version: "*"
+    override_path: "../../"