Member fields not initialised in unit tests when set in inspector for unity

I have fields that are set in the inspector.

The length of this array is then printed to the console when the game plays as expected

        public void Start() {
            Debug.Log(bootstrapData.Length);
        }

        public void printData()
        {
            Debug.Log(bootstrapData.Length);
        }

But when I run a test calling the printData in play mode the bootstrapData is null as they are not set from the inspector I am assuming.

[UnityTest]
        public IEnumerator test()
        {
            GameObject go = new GameObject();
            SpriteBootstrap spriteBootstrap = go.AddComponent<SpriteBootstrap>();
            spriteBootstrap.printData(); // null pointer here, data not set

            //... other irrelevant code            
        }

Is this normal behaviuor and can I get around this without manualy setting the data in the test.