Added test for pexpect.which()
Added test for pexpect.which()


blink1073/pexpect,dongguangming/pexpect,bangi123/pexpect,nodish/pexpect,Wakeupbuddy/pexpect,blink1073/pexpect,crdoconnor/pexpect,bangi123/pexpect,Wakeupbuddy/pexpect,blink1073/pexpect,Wakeupbuddy/pexpect,bangi123/pexpect,nodish/pexpect,crdoconnor/pexpect,Depado/pexpect,quatanium/pexpect,dongguangming/pexpect,quatanium/pexpect,dongguangming/pexpect,quatanium/pexpect,Wakeupbuddy/pexpect,Depado/pexpect,dongguangming/pexpect,nodish/pexpect,Depado/pexpect,rockaboxmedia/pexpect,bangi123/pexpect,rockaboxmedia/pexpect,crdoconnor/pexpect,Depado/pexpect