For me, the best time to do Test Track is at night.
One night, we ate at Cape May Cafe in the Beach Club and then we went back to EPCOT to watch Illuminations. At about 8:30, we decided to see if Test Track was still open because we had some time to kill. Believe it or not, it was open with a 5 minute wait. We went on it three times that night and on our last ride, we saw Illuminations from the outside part. It was so awesome. Now on every trip we make an effort to go on Test Track right before 9:00.
One night, we ate at Cape May Cafe in the Beach Club and then we went back to EPCOT to watch Illuminations. At about 8:30, we decided to see if Test Track was still open because we had some time to kill. Believe it or not, it was open with a 5 minute wait. We went on it three times that night and on our last ride, we saw Illuminations from the outside part. It was so awesome. Now on every trip we make an effort to go on Test Track right before 9:00.