(tests) add test for #2953

test/bash/instance-number.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+SRC=$(cd $(dirname "$0"); pwd)
+source "${SRC}/include.sh"
+cd $file_path
+
+$pm2 start server.js -i -100
+should 'should have started 1 processes' 'online' 1
+
+$pm2 delete all

test/pm2_behavior_tests.sh

@@ -131,6 +131,8 @@ bash ./test/bash/daemon-paths-override.sh
 spec "Override daemon configuration paths"
 bash ./test/bash/increment-var.sh
 spec "Increment env variables"
+bash ./test/bash/instance-number.sh
+spec "Negative instance number spawn one worker"
 
 # Issues related
 bash ./test/bash/issues/2337.sh