This is the most basic example you can have with an Arduino, an Easy Driver, and a stepper motor;) https://medium.com/jungletronics/easydriver-4-wire-stepper-motor-driver-9f32b233efe6

_48_EASYDRIVER_test_motor_01.ino

/* Project Ardu_Serie # 48
  EASYDRIVER: 4-Wire-Stepper Motor Driver - Brian Schmalz Design on A3967 IC 
              Bi-Polar Motors — .75A@30v peak — Making Using This a Breeze!
   Code I
   From: Brian Schmalz - Easy Driver Examples - Sample code and projects to get your stepper running!
   http://www.schmalzhaus.com/EasyDriver/Examples/EasyDriverExamples.html

   Objective: Hi,This is the most basic example you can have with an Arduino,
              an Easy Driver, and a stepper motor;)
 */

void setup() {
     pinMode(8, OUTPUT);
     pinMode(9, OUTPUT);
     digitalWrite(8, LOW);
     digitalWrite(9, LOW);
}

void loop() {
     digitalWrite(9, HIGH);
     delay(1);
     digitalWrite(9, LOW);
     delay(1);
}