Editor Build Test to check if Keystore passwords are entered

BuildTests.cs

using NUnit.Framework;
using UnityEditor;

public class BuildTests
{

	[Test]
	public void TestAndroidKeystoreBeforeBuild()
	{
		Assert.IsNotNullOrEmpty(PlayerSettings.keystorePass, "Key Store Password");
		Assert.IsNotNullOrEmpty(PlayerSettings.keyaliasPass, "Key Alias Password");
	}

}