[New] `install.sh`: allow user to explicitly opt out of nvm adding the source string
this is done by checking if the user supplies `PROFILE=/dev/null` when running `install.sh`, the `nvm_detect_profile` function will not output any strings, causing `nvm_do_install` to skip adding `SOURCE_STR`.
diff --git a/test/install_script/nvm_detect_profile b/test/install_script/nvm_detect_profile
index 1044659..54815ec 100755
--- a/test/install_script/nvm_detect_profile
+++ b/test/install_script/nvm_detect_profile
@@ -28,6 +28,12 @@
# Confirm profile detection via $SHELL works and that $PROFILE overrides profile detection
#
+# setting $PROFILE to /dev/null should return no detected profile
+NVM_DETECT_PROFILE="$(PROFILE='/dev/null'; nvm_detect_profile)"
+if [ -n "$NVM_DETECT_PROFILE" ]; then
+ die "nvm_detect_profile still detected a profile even though PROFILE=/dev/null"
+fi
+
# .bashrc should be detected for bash
NVM_DETECT_PROFILE="$(BASH_VERSION="1"; unset PROFILE; nvm_detect_profile)"
if [ "$NVM_DETECT_PROFILE" != "$HOME/.bashrc" ]; then
