diff --git a/.arduino-ci.yml b/.arduino-ci.yml
new file mode 100644
index 0000000..ff5659b
--- /dev/null
+++ b/.arduino-ci.yml
@@ -0,0 +1,7 @@
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    - leonardo
+    - due
+    - zero
diff --git a/.github/workflows/arduino_test_runner.yml b/.github/workflows/arduino_test_runner.yml
new file mode 100644
index 0000000..476456b
--- /dev/null
+++ b/.github/workflows/arduino_test_runner.yml
@@ -0,0 +1,13 @@
+---
+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  arduino_ci:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: Arduino-CI/action@master
+          #   Arduino-CI/action@v0.1.1
diff --git a/I2C_eeprom.h b/I2C_eeprom.h
index 8b91959..7e625b6 100644
--- a/I2C_eeprom.h
+++ b/I2C_eeprom.h
@@ -60,7 +60,6 @@ public:
 
   int      determineSize();
 
-
 private:
   uint8_t  _deviceAddress;
   uint32_t _lastWrite;     // for waitEEReady
diff --git a/README.md b/README.md
index 455f10b..b314d9b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,8 @@
+
+[![Arduino CI](https://github.com/RobTillaart/I2C_EEPROM/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/I2C_EEPROM/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RobTillaart/I2C_EEPROM.svg?maxAge=3600)](https://github.com/RobTillaart/I2C_EEPROM/releases)
+
 # I2C_EEPROM
 
 Arduino Library for external I2C EEPROM - 24LC256, 24LC64
@@ -8,13 +13,14 @@ Library to access external I2C EEPROM.
 
 The interface is pretty straightforward
 
-* readByte - read a single byte from a given address
-* writeByte
-* setBlock
-* readBlock
-* writeBlock
-* determineSize
-
+- **begin()** constructor
+- **begin(sda, scl)** constructor for ESP32
+- **writeByte(address, value)** write a single byte
+- **writeBlock(address, buffer, length)** 
+- **setBlock(address, value, length)** e.g. use to clear I2C EEPROM
+- **readByte(address)** - read a single byte from a given address
+- **readBlock(address, buffer, length)**
+- **determineSize()**
 
 
 ## Limitation
diff --git a/test/unit_test_001.cpp b/test/unit_test_001.cpp
new file mode 100644
index 0000000..fc419b6
--- /dev/null
+++ b/test/unit_test_001.cpp
@@ -0,0 +1,68 @@
+//
+//    FILE: unit_test_001.cpp
+//  AUTHOR: Rob Tillaart
+//    DATE: 2020-12-22
+// PURPOSE: unit tests for the I2C_EEPROM library
+//          https://github.com/RobTillaart/
+//          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
+//
+
+// supported assertions
+// https://github.com/Arduino-CI/arduino_ci/blob/master/cpp/unittest/Assertion.h#L33-L42
+// ----------------------------
+// assertEqual(expected, actual)
+// assertNotEqual(expected, actual)
+// assertLess(expected, actual)
+// assertMore(expected, actual)
+// assertLessOrEqual(expected, actual)
+// assertMoreOrEqual(expected, actual)
+// assertTrue(actual)
+// assertFalse(actual)
+// assertNull(actual)
+// assertNotNull(actual)
+
+#include <ArduinoUnitTests.h>
+
+#define assertEqualFloat(arg1, arg2, arg3)  assertOp("assertEqualFloat", "expected", fabs(arg1 - arg2), compareLessOrEqual, "<=", "actual", arg3)
+#define assertEqualINF(arg)  assertOp("assertEqualINF", "expected", INFINITY, compareEqual, "==", "actual", arg)
+#define assertEqualNAN(arg)  assertOp("assertEqualNAN", "expected", true, compareEqual, "==", "actual", isnan(arg))
+
+
+#include "Arduino.h"
+#include "I2C_eeprom.h"
+
+
+
+unittest_setup()
+{
+}
+
+unittest_teardown()
+{
+}
+
+/*
+unittest(test_new_operator)
+{
+  assertEqualINF(exp(800));
+  assertEqualINF(0.0/0.0);
+  assertEqualINF(42);
+  
+  assertEqualNAN(INFINITY - INFINITY);
+  assertEqualNAN(0.0/0.0);
+  assertEqualNAN(42);
+}
+*/
+
+unittest(test_constructor)
+{
+  I2C_eeprom EE(48);
+  EE.begin();
+  
+  
+  assertEqual(1, 1);
+}
+
+unittest_main()
+
+// --------