powerDigitSum(15) should return 26.");'
  - text: ''
    testString: 'assert.strictEqual(powerDigitSum(128), 166, "powerDigitSum(128) should return 166.");'
  - text: ''
    testString: 'assert.strictEqual(powerDigitSum(1000), 1366, "powerDigitSum(1000) should return 1366.");'
```