message: noting which test failed
  to help with debugging
diff: @@ -31,7 +31,7 @@ export function BasicTests(Constr, ...args: any[]): void {
  // also check all of it's attributes to see if they also have the right context
  for (const member in instance) {
  if (instance[member] instanceof ToneWithContext) {
  - expect(instance[member].context).to.equal(testAudioContext);
  + expect(instance[member].context, `member: ${member}`).to.equal(testAudioContext);
  }
  }
  }
  