ipfs add: added test case to verify presence of size

Added test case which greps the `ipfs add` api call,
checking that it outputs the added item's size.

License: MIT
Signed-off-by: Tom O'Donnell <todonnell91@gmail.com>

test/sharness/t0410-api-add.sh

+#!/bin/sh
+#
+# Copyright (c) 2016 Tom O'Donnell
+# MIT Licensed; see the LICENSE file in this repository.
+#
+
+test_description="Test API add command"
+
+. lib/test-lib.sh
+
+test_init_ipfs
+
+# Verify that that API add command returns size
+
+test_launch_ipfs_daemon
+test_expect_success "API Add response includes size field" '
+  echo "hi" | curl -s -F file=@- "http://localhost:$API_PORT/api/v0/add" | grep "\"Size\": *\"11\""
+'
+test_kill_ipfs_daemon
+
+test_done