add sharness test for DNS resolution on API CLI flag.

License: MIT
Signed-off-by: Raúl Kripalani <raul.kripalani@gmail.com>

test/sharness/t0236-cli-api-dns-resolve.sh

+#!/usr/bin/env bash
+#
+# Copyright (c) 2015 Jeromy Johnson
+# MIT Licensed; see the LICENSE file in this repository.
+#
+
+test_description="test dns resolution of api endpoint by cli"
+
+. lib/test-lib.sh
+
+test_init_ipfs
+
+# this test uses the localtest.me domain which resolves to 127.0.0.1
+# see http://readme.localtest.me/
+# in case if failure, check A record of that domain
+test_expect_success "can make http request against dns resolved nc server" '
+  nc -ld 5005 > nc_out &
+  NCPID=$!
+  go-sleep 0.5s && kill "$NCPID" &
+  ipfs cat /ipfs/Qmabcdef --api /dns4/localtest.me/tcp/5005 || true
+'
+
+test_expect_success "request was received by local nc server" '
+  grep "POST /api/v0/cat" nc_out
+'
+
+test_done