Vendoring bats libraries.

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

lib/bats-support/test/50-output-10-batslib_err.bats

@@ -0,0 +1,16 @@
+#!/usr/bin/env bats
+
+load test_helper
+
+@test 'batslib_err() <message...>: displays <message...>' {
+  run batslib_err 'm1' 'm2'
+  [ "$status" -eq 0 ]
+  [ "$output" == 'm1 m2' ]
+}
+
+@test 'batslib_err(): reads <message...> from STDIN' {
+  run bash -c "source '${TEST_MAIN_DIR}/load.bash'
+               echo 'm1' 'm2' | batslib_err"
+  [ "$status" -eq 0 ]
+  [ "$output" == 'm1 m2' ]
+}