Reply to post:

A year of software testing appears wasted as ‘upgrade’ shutters Australian stock exchange on its debut

Lee D Silver badge

RUN.

IN.

PARALLEL.

WITH.

OLD.

SYSTEM.

DUPLICATING.

THE.

REAL.

LIVE.

DATA.

Anything else is not "testing", it's just guessing if it will work or not.

Branch off the real data (or even just a portion), feed it through your test system, check that the answers match and/or that the behaviour is as expected.

Leave it like that for a significant period of time. Only THEN do you think about actually swapping out the old.

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