Vendoring bats libraries.

Signed-off-by: Chad Metcalf <chad@docker.com>

lib/bats-assert/test/refute.bats

@@ -0,0 +1,18 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test 'refute() <expression>: returns 0 if <expression> evaluates to FALSE' {
+  run refute false
+  assert_test_pass
+}
+
+@test 'refute() <expression>: returns 1 and displays <expression> if it evaluates to TRUE' {
+  run refute true
+  assert_test_fail <<'ERR_MSG'
+
+-- assertion succeeded, but it was expected to fail --
+expression : true
+--
+ERR_MSG
+}