Add test-lib.sh for our shell test framework

Our test framework is based on Sharness.
So the first thing to do is to source it.

test/test-lib.sh

@@ -0,0 +1,34 @@
+# Test framework for go-ipfs
+#
+# Copyright (c) 2014 Christian Couder
+# MIT Licensed; see the LICENSE file in this repository.
+#
+# We are using sharness (https://github.com/mlafeldt/sharness)
+# which was extracted from the Git test framework.
+
+# You need either sharness to be installed system-wide
+# or to set SHARNESS_DIRECTORY properly
+
+if test -z "$SHARNESS_DIRECTORY"
+then
+	SHARNESS_DIRECTORY=/usr/local/share/sharness
+fi
+
+SHARNESS_LIB="$SHARNESS_DIRECTORY/sharness.sh"
+
+test -f "$SHARNESS_LIB" || {
+	echo >&2 "Cannot find sharness.sh in: $SHARNESS_DIRECTORY"
+	echo >&2 "Please install Sharness system-wide or set the"
+	echo >&2 "SHARNESS_DIRECTORY environment variable."
+	echo >&2 "See: https://github.com/mlafeldt/sharness"
+	exit 1
+}
+
+. "$SHARNESS_LIB" || {
+	echo >&2 "Cannot source: $SHARNESS_LIB"
+	echo >&2 "Please check Sharness installation."
+	exit 1
+}
+
+# Please put go-ipfs specific shell functions below
+