ogress,
                           expectedProgress,
                           0.01,
                           'The progress should be approximately ' +
                           `${expectedProgress} at ${sampleTime}ms`);
    }
  }, `Transformed progress for ${params.desc}`);
}

// Additional tests for various boundary conditions of step timing functions.

const gStepTimingFunctionTests = [
  {
    description: 'Test bounds point of step-start easing',
    effect:     {
                  delay: 1000,
   