public void CanReduce()
{
ParameterExpression variable = Expression.Variable(typeof(int));
UnaryExpression op = Expression.PostDecrementAssign(variable);
Assert.True(op.CanReduce);
Assert.NotSame(op, op.ReduceAndCheck());
}
public void CannotReduceThrow()
{
UnaryExpression throwExp = Expression.Throw(Expression.Constant(new TestException()));
Assert.False(throwExp.CanReduce);
Assert.Same(throwExp, throwExp.Reduce());
Assert.Throws <ArgumentException>(() => throwExp.ReduceAndCheck());
}