Bass test is typically an audio recording which consists synthesized low frequency bass notes played with repeated melody.
Generally bass test is used to check the bass response of audio systems and its more popularly used in audio woofers and subwoofers.
Bass tests are usually done under frequencies of 50 hertz as below this frequency there is very small musical content.
The most popular bass test of all time is Bass, I Love You by Bassotronics.
Second most popular bass test is Woofer Cooker by Boston Acoustics.
Another one is commonly known as Eminent Technolgy Rotary Woofer Bass Test which was designed to test the low frequency response of rotary woofers.