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How much time it will take for regression testing
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Answer Posted / nag
The re-execution of
selected test cases on modified build to ensure bug fix work
with out any side effects is called Regression Testing.
(Change Testing)
Level -2 (Regression Testing):
During
above level-1 comprehensive testing, testing people are
reporting mismatches between test cases expected and build
actual to development team as ?defect report?. After
reviewing and resolving the defect, development people are
releasing modified build to testing team. In this stage, a
development person is releasing ?release note? also. The
responsible test engineers are studying that release note
and try to understand modifications in that modify build
and then test engineers are concentrating on regression
testing to ensure that modifications.
Level-0
Level-1
Check in  Level-2  Check-out
(Regression)
From the above diagram, test engineers are conducting
regression testing on modified build w.r.p.t modifications,
which are mentioned in ?release note?.
Study release note & consider severity of resolved bug
High Medium Low
all P0 (priority) all P0
some P0
all P1 max P 1
some P1
max P2 test cases some P2 test cases some P2
test cases
On modified build
Case1: If the development team resolved bug severity is high
then test engineers are re-executing all P0, all P1 and
carefully selected maximum P2 test cases on that modified
build w.r.p.t modifications mentioned in release note
Case2: If the development team resolved bug severity is
medium then test engineers are re-executing all P0 carefully
selected all P1 and some of P2 test cases.
Case3: If the development team resolved bug severity is low
then test engineers are re-executing carefully selected some
P0, P1, P2 test cases.
Case4: If testing team received modified build due to sudden
changes in customer requirements, then test engineers are
re-executing all P0, all P1, max P2 test cases.
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