bc: add tests.

srcpkgs/bc/template

@@ -25,3 +25,22 @@ fi
 do_build() {
 	make ${makejobs} LEX="flex -I"
 }
+do_check() {
+	# LFS tells us that there are 10 know failures
+	# What happens here
+	# 1. echo "quit" so bc will quit after running Test/checklib.b
+	# 2. tee to /dev/tty so the Maintainer will see the output of the tests
+	# 3. grep the Total failures for any number between 1 and 199
+	# 4. cut Total failures: from the numbers
+	# 5. use awk to sum the numbers
+	failures="$(echo "quit" | ./bc/bc -l Test/checklib.b | tee /dev/tty | grep 'Total failures: [1-9]\|1[0-9]\|1[0-9][0-9]' | cut -d: -f2 | awk '{s+=$1} END {print s}' )"
+
+	# 6. Check if there are more than then 10 Know test failures as pointed by LFS
+	# http://www.linuxfromscratch.org/lfs/view/development/chapter06/bc.html
+	if [ "$failures" -gt 10 ]; then
+		echo "THERE ARE MORE THAN THE 10 KNOW FAILURES"
+		return 1
+	else
+		echo "TESTS PASSED"
+	fi
+}