Then three exact formulae for calculating the expectedtesttime are derived and proved briefly equivalent each other.
然后给出三种计算期望试验时间(ett)的精确公式，并简略证明它们是等同的。
2
This time, the test passes as expected.
这一次，与预期的一样，测试通过了。
3
I have seen teams doing this that reduce defect rates to 5% (or less!) of what they once were prior to test driven development... while at the same time delivering projects faster than expected.