From e053b211e8fa684e2bb06c90e7003ed09bed79ea Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 20 Aug 2014 20:04:20 -0400
Subject: tests/common.sh: test_diff(): New function

---
diff --git a/tests/common.sh b/tests/common.sh
index 5f8b24f..525aeb7 100644
--- a/tests/common.sh
+++ b/tests/common.sh
@@ -66,3 +66,53 @@ else
 	mgn='' # Magenta.
 	std=''     # No color.
 fi
+
+test_diff()
+{
+	local good_results="${1}"
+	local test_results="${2}"
+
+	printf 'Diff:\n'
+	exec 3<<-EOF
+		${good_results}
+		EOF
+	exec 4<<-EOF
+		${test_results}
+		EOF
+	line_no=0
+	while :; do
+		line_no=$(($line_no + 1))
+		errors=0
+		read -r good_line <&3 || errors=$(($errors + 1))
+		read -r test_line <&4 || errors=$(($errors + 1))
+		[ ${errors} -eq 2 ] && break
+		if [ "x${good_line}" = "x${test_line}" ]; then
+			printf '%3d  %s\n' ${line_no} "${good_line}"
+		else
+			printf '%3d %s-%s%s\n' ${line_no} "${red}" \
+				"${good_line}" "${std}"
+			printf '%3d %s+%s%s\n' ${line_no} "${grn}" \
+				"${test_line}" "${std}"
+			tests_es=1
+		fi
+	done
+	exec 3<&-
+	exec 4<&-
+	
+	printf '\nExpected results:\n'
+	line_no=0
+	while read -r line; do
+		line_no=$(($line_no + 1))
+		printf '%3d %s\n' ${line_no} "${line}"
+	done <<-EOF
+		${good_results}
+		EOF
+	printf '\nTest results:\n'
+	line_no=0
+	while read -r line; do
+		line_no=$(($line_no + 1))
+		printf '%3d %s\n' ${line_no} "${line}"
+	done <<-EOF
+		${test_results}
+		EOF
+}
--
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