diff --git a/test/fast/Unit tests/nvm_ensure_version_prefix b/test/fast/Unit tests/nvm_ensure_version_prefix
new file mode 100755
index 0000000..72b301c
--- /dev/null
+++ b/test/fast/Unit tests/nvm_ensure_version_prefix	
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+die () { echo $@ ; exit 1; }
+
+. ../../../nvm.sh
+
+[ "_$(nvm_ensure_version_prefix 1)" = "_v1" ] || die '"nvm_ensure_version_prefix 1" did not return "v1"'
+[ "_$(nvm_ensure_version_prefix v1)" = "_v1" ] || die '"nvm_ensure_version_prefix v1" did not return "v1"'
+[ "_$(nvm_ensure_version_prefix foo)" = "_foo" ] || die '"nvm_ensure_version_prefix foo" did not return "foo"'