You need to take a test and pass it to drive a car. Why don't we need to take tests and pass them in order to VOTE?

Because those setting the tests will use them to indoctrinate their concept of political correctness. 

Do I think people should have to pass a basic test before voting?

YES!!!
I always felt that way.
There are so many people who just vote for whoever their family or neighbours are voting for.
I've actually heard my mother ask her friends "Who are we voting for?"
I think that just a basic multiple choice test should be manditory to show that you are aware of who the candidates are and what positions they hold on current issues.
You should also be at least able to identify your current President, Vice President, Secretary of state etc.
I first started thinking people should need to qualify to vote after I saw this clip.

You realize the reason there are no tests for voting ... is because there used to be such test requirements.

And who decides what is in those tests?
The same people who draw voting district lines.  The politicians currently in office.
So you should be able to guess what happened.
The politicians made the tests so that only people they wanted to vote, could vote.

A far better solution would be to require a series of Civics classes, starting in middle school ... designed by objective scholars to take into account the entire history of our government.  Both the good and bad.  Including the history of nations we are allies or enemies with, so future generations can better understand the importance of diplomacy before war.