add tets for list

.gitignore

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+.pio/
+.vscode/

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[platformio]
+default_envs = native
+
+[env:native]
+platform = native
+debug_build_flags = -std=c++11

test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html

test/utils.cpp

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+#include <unity.h>
+#include "utils.h"
+
+void setUp(void) {
+    // set stuff up here
+}
+
+void tearDown(void) {
+    // clean stuff up here
+}
+
+void test_add(void) {
+    List<int> list;
+    int value = 10;
+    list.add(&value);
+    TEST_ASSERT_EQUAL(value, *list.last->t);
+    TEST_ASSERT_EQUAL_PTR(list.first, list.last);
+
+    int value2 = 12;
+    list.add(&value2);
+    TEST_ASSERT_EQUAL(value2, *list.last->t);
+    TEST_ASSERT_EQUAL_PTR(list.first->next, list.last);
+}
+
+void test_empty(void) {
+    List<int> list;
+    int value = 10;
+    list.add(&value);
+    list.add(&value);
+    list.empty();
+    TEST_ASSERT_EQUAL_PTR(nullptr, list.first);
+    TEST_ASSERT_EQUAL_PTR(list.first, list.last);
+}
+
+int main(int argc, char **argv) {
+    UNITY_BEGIN();
+    RUN_TEST(test_add);
+    RUN_TEST(test_empty);
+    UNITY_END();
+
+    return 0;
+}