Bash, grep between two lines with specified string

Question

Example:

a43
test1
abc
cvb
bnm
test2
kfo

I need all lines between test1 and test2. Normal grep does not work in this case. Do you have any

Answer 1

The answer by PratPor above:

cat test.txt | grep -A10 test1 | grep -B10 test2

is cool.. but if you don't know the file length:

cat test.txt | grep -A1000 test1 | grep -B1000 test2

Not deterministic, but not too bad. Anyone have better (more deterministic)?