--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lldb/test/Shell/Settings/TestSettingsSet.test	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,15 @@
+# This tests setting setting values.
+
+# Check that setting an empty value with -f(orce) clears the value.
+# RUN: %lldb -b -s %s 2>&1 | FileCheck %s
+
+settings set tab-size 16
+settings show tab-size
+# CHECK: tab-size (unsigned) = 16
+
+settings set -f tab-size
+settings show tab-size
+# CHECK: tab-size (unsigned) = 4
+
+settings set tab-size
+# CHECK: error: 'settings set' takes more arguments