[Tests] show `type` output for debugging

test/install_script/nvm_reset

@@ -5,12 +5,21 @@ cleanup () {
 }
 die () { echo $@ ; cleanup ; exit 1; }
 
-NVM_ENV=testing . ../../install.sh
-
 safe_type() {
-  type "$1" > /dev/null 2>&1
+  type "$1"
 }
 
+# precondition: the names should be unset
+! safe_type nvm_do_install || die 'nvm_do_install is still available'
+! safe_type nvm_has || die 'nvm_has is still available'
+! safe_type nvm_download || die 'nvm_download is still available'
+! safe_type install_nvm_as_script || die 'install_nvm_as_script is still available'
+! safe_type install_nvm_from_git || die 'install_nvm_from_git is still available'
+! safe_type nvm_reset || die 'nvm_reset is still available'
+! safe_type nvm_detect_profile || die 'nvm_detect_profile is still available'
+
+NVM_ENV=testing . ../../install.sh
+
 # Check nvm_reset exists
 safe_type nvm_reset || die 'nvm_reset is not available'