bin/install-wp-tests.sh: 26 Syntax error

[endriu84]

Hello,
I got this error on every plugin i try to wrap with tests
I use: wp scaffold plugin-tests some-plugin

and I'm getting error when I'm trying to run sh script:

bin/install-wp-tests.sh: 26: bin/install-wp-tests.sh: Syntax error: "(" unexpected (expecting "then")

lines from 26 to 30 looks like this
if [[ $WP_VERSION =~ [0-9]+.[0-9]+(.[0-9]+)? ]]; then
WP_TESTS_TAG="tags/$WP_VERSION"
elif [[ $WP_VERSION == 'nightly' || $WP_VERSION == 'trunk' ]]; then
WP_TESTS_TAG="trunk"
else

I'm on ubuntu 16.

[gitlost]

It's a bash script so needs to be run by bash, not sh.

[endriu84]

Thank You gitlost, It works with bash :)