Is there GED testing during the summer in Michigan?

Hello. I'm planning on taking the G.E.D test next month which is July. My question is does anyone know if there is G.E.D testing available during the summer in Michigan or not? I'm not sure if there is because it is summer and school's out. I've tried doing some research on it but have no been able to find an answer. If someone could help me with this it would be greatly appreciated! I'm looking for testing centers in the Flint, Burton, or Grand Blanc area in Michigan. Thank you in advance.