unittest: using niceload for test12 my machine is not completely

unusable during unittests

unittest/Makefile

@@ -10,6 +10,7 @@ unittest: ../src/parallel tests-to-run/* wanted-results/*
 	expect -c 'spawn cat; puts "expect is installed"' || (echo expect is required for unittest; /bin/false)
 	echo | pv -qL 10 || (echo pv is required for unittest; /bin/false)
 	echo | script -c echo -q /dev/null || (echo script is required for unittest; /bin/false)
+	niceload true || (echo niceload is required for unittest; /bin/false)
 	time sh Start.sh
 	date
 

unittest/tests-to-run/test12.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-PAR=parallel
-
 # Test if we can deal with output > 4 GB
-echo | $PAR 'dd if=/dev/zero count=43 bs=100000k; echo 1; echo 2' | md5sum
+echo | niceload -l=1.5 parallel -q perl -e '$a="x"x1000000;for(0..4300){print $a}' | md5sum
+# dd does not work with niceload (no idea why)
+#echo | parallel 'dd if=/dev/zero count=43 bs=100000k; echo 1; echo 2' | md5sum

unittest/wanted-results/test12

@@ -1 +1 @@
-75da7edc12b129d109af92592c61da56  -
+46a318993dfc8e2afd71ff2bc6f605f1  -