An image forming apparatus includes an image forming unit configured to form an image on a sheet. The image forming unit includes a photosensitive member; a charger configured to charge the photosensitive member based on a charging potential; an exposure unit configured to expose the photosensitive member charged by the charger to light to form an electrostatic latent image on the photosensitive member, an exposure intensity of the exposure unit being controlled based on an exposure condition; a developing sleeve configured to develop the electrostatic latent image; and one or more processors configured to perform operations including controlling the image forming unit to form a line test image and a width test image.