test(sharness): add gateway symlink test

test/sharness/t0113-gateway-symlink.sh

+#!/usr/bin/env bash
+#
+# Copyright (c) Protocol Labs
+
+test_description="Test symlink support on the HTTP gateway"
+
+. lib/test-lib.sh
+
+test_init_ipfs
+test_launch_ipfs_daemon
+
+
+test_expect_success "Create a test directory with symlinks" '
+  mkdir testfiles &&
+  echo "content" > testfiles/foo &&
+  ln -s foo testfiles/bar &&
+  test_cmp testfiles/foo testfiles/bar
+'
+
+test_expect_success "Add the test directory" '
+  HASH=$(ipfs add -Qr testfiles)
+'
+
+test_expect_success "Test the directory listing" '
+  curl "$GWAY_ADDR/ipfs/$HASH" > list_response &&
+  test_should_contain ">foo<" list_response &&
+  test_should_contain ">bar<" list_response
+'
+
+test_expect_success "Test the symlink" '
+  curl "$GWAY_ADDR/ipfs/$HASH/bar" > bar_actual &&
+  echo -n "foo" > bar_expected &&
+  test_cmp bar_expected bar_actual
+'
+
+test_kill_ipfs_daemon
+
+test_done