There is probably a more elegant way to do it but you can always use a lock object like this...
private static Object LockObject = new object();
public void TestMethod1()
{
lock(LockObject)
{
Object1.StaticMember = 1;
Object2 test = new Object2();
Assert.AreEqual("1", test.getStaticVal());
}
}
public void TestMethod2()
{
lock (LockObject)
{
Object1.StaticMember = 2;
Object2 test = new Object2();
Assert.AreEqual("2", test.getStaticVal());
}
}