[lit] Add a test suite for lit itself.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173999 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/lit/tests/usage.py b/utils/lit/tests/usage.py
new file mode 100644
index 0000000..e10d613
--- /dev/null
+++ b/utils/lit/tests/usage.py
@@ -0,0 +1,6 @@
+# Basic sanity check that usage works.
+#
+# RUN: %{lit} --help > %t.out
+# RUN: FileCheck < %t.out %s
+#
+# CHECK: Usage: lit.py [options] {file-or-path}