Here are tips for debugging stepper motor systems as well as general bench testing advice based on the personal experience of co-authors.
Do you have a bad stepper motor? How to easily test.
Tips and tricks for testing, debugging brushed DC motors - Planet
Stepper Motor Test Fixture : 3 Steps - Instructables
How to quickly tune your stepper motor - Industrial - Technical
Stepper Motor Test Fixture : 3 Steps - Instructables
Stepper Motor Test Fixture : 3 Steps - Instructables
Stepper Motors and Arduino - The Ultimate Guide
Stepper motor doesn't work with CNC shield and DRV8825 driver
EZTip #4 - Testing and Checking your Stepper Motors
Tips and tricks for testing and debugging stepper motors - Planet
Analog Computing Articles and News - Planet Analog
Stepper Motor Test Fixture : 3 Steps - Instructables
Easy Driver Hook-up Guide - SparkFun Learn
Tips and tricks for testing, debugging brushed DC motors - Planet