Anyone can learn computer science, even at the elementary school level. This book delves into the essential computer science concept of testing using age-appropriate language and colorful illustrations. A meaningful storyline is paired with an accessible curricular topic to engage and excite readers. This book introduces readers to a relatable character and familiar situation, which demonstrates how testing is used in everyday life. Molly makes a circuit and then tests it to make sure it works. This fiction book is paired with the nonfiction book Finding the Best Conductor (ISBN: 9781538353189). The instructional guide on the inside front and back covers provides: Vocabulary, Background knowledge, Text-dependent questions, Whole class activities, and Independent activities.