Add test that unmarking for export prevents inheritence by child shell

meta-tests.txt

@@ -6,3 +6,4 @@ subshell-export
 function-list
 function-unload
 function-export
+function-unexport

meta-tests/function-unexport.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+list_function_names() {
+    declare -F | while read l; do echo ${l/#* /}; done | sort
+}
+declare -xf list_function_names
+
+f_orig=$(list_function_names)
+
+source ./mo
+moExport
+moUnexport
+
+f=$(bash -c list_function_names)
+
+diff <(echo $f_orig | tr ' ' '\n') <(echo $f | tr ' ' '\n')