Re: C++ fluency
On May 7, 5:30 pm, "Phlip" <phlip2...@gmail.com> wrote:
James Kanze wrote:
I thought that one of the D's in TDD stood for "design".
[...]
That would be impressive. In the well run companies I've
worked in, the bug rate was generally less than 1 per 100
KLOC of code going into integration. You're saying that TDD
will give bug rates of less than one error per million lines
of code?
No - the 10% metric goes from Waterfall or Code-n-Fix to TDD.
Not from excessive unit testing to TDD.
In other words, a "methodology" which has never existed in
practice, and the absense of a methodology (which has been known
bad practice for at least 20 years). The measures would be more
interesting if there was a comparison with currently used good
methodologies. How much would a company at SEI level 3 gain,
for example? (Or would it loose? The fact that companies at
high SEI levels aren't adopting TDD suggests that it actually
reduced productivity.)
I think these "well run companies" (ie companies that people
like Ian, Noah, or me are not smart enough to run) would still
achieve a much higher velocity.
The fact remains that they don't. And a well run company does
evaluate and try new technologies, measuring there impact, and
adopting those that improve something.
And I also question the definition of "bug". If it's
"divergence from the specification", then you might be
underrepresenting the other definition - "features the users
don't like". That rate will go down as your velocity goes up
and you deploy more often, in smaller feature increments.
First, I don't usually speak of bugs, I speak of defects. And a
defect can also be something which makes the code harder to
maintain or to understand.
When you change your code, you don't normally integrate the
results immediately anyway.
Yes you do.
Before you test it?
A TDD project can integrate any code change, and could deploy
& release after each 1-line edit.
That's the stupidest claim I've heard to date. If modify an
interface (for whatever reasons), I can't deploy until the
client code has modified its use of my code.
Please don't tell me this is impossible because I have done
it.
So you've never worked on anything more than a one man toy. Or
you're just lying. Or who knows what. At any rate, you're not
making sense, and you're making impossible claims.
--
James Kanze (GABI Software) email:james.kanze@gmail.com
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