ahell: update testsuite

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-vars/var_nested1.tests b/shell/ash_test/ash-vars/var_nested1.tests
new file mode 100755
index 0000000..59e4a14
--- /dev/null
+++ b/shell/ash_test/ash-vars/var_nested1.tests
@@ -0,0 +1,16 @@
+f() { a=A; b=B; }
+
+a=a
+b=b
+f
+echo Expected:AB Actual:$a$b
+
+a=a
+b=b
+b= f
+echo Expected:Ab Actual:$a$b
+
+a=a
+b=b
+a= b= f
+echo Expected:ab Actual:$a$b