diff --git a/test/test_main.cpp b/test/test_main.cpp
index e69de29..f170d56 100644
--- a/test/test_main.cpp
+++ b/test/test_main.cpp
@@ -0,0 +1,42 @@
+#include <Arduino.h>
+#include <unity.h>
+
+String STR_TO_TEST;
+
+void setUp(void) {
+    // set stuff up here
+    STR_TO_TEST = "Hello, world!";
+}
+
+void tearDown(void) {
+    // clean stuff up here
+    STR_TO_TEST = "";
+}
+
+
+void test_led_builtin_pin_number(void) {
+    TEST_ASSERT_EQUAL(2, LED_BUILTIN);
+}
+
+
+void test_string_concat(void) {
+    String hello = "Hello, ";
+    String world = "world!";
+    TEST_ASSERT_EQUAL_STRING(STR_TO_TEST.c_str(), (hello + world).c_str());
+}
+
+
+void setup()
+{
+    delay(2000); // service delay
+    UNITY_BEGIN();
+
+    RUN_TEST(test_led_builtin_pin_number);
+    RUN_TEST(test_string_concat);
+
+    UNITY_END(); // stop unit testing
+}
+
+void loop()
+{
+}
\ No newline at end of file