diff --git a/sh/tests/greatest-of-all_test.sh b/sh/tests/greatest-of-all_test.sh
index 7a4556ed6..138a7a266 100755
--- a/sh/tests/greatest-of-all_test.sh
+++ b/sh/tests/greatest-of-all_test.sh
@@ -5,25 +5,23 @@ IFS='
 script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
 
 challenge() {
-
-    submitted=$(echo -e "0\n3\n2\n5\n7\n1\n4\n9\n8\n6\n10" | bash -c ""$script_dirS"/student/greatest-of-all.sh")
-    expected=$(echo -e "0\n3\n2\n5\n7\n1\n4\n9\n8\n6\n10" | bash -c ""$script_dirS"/solutions/greatest-of-all.sh")
-    diff <(echo "$submitted") <(echo "$expected")
-    submitted=$(echo -e "26\n85\n21\n94\n68\n60\n99\n31\n10\n98\n" | bash -c ""$script_dirS"/student/greatest-of-all.sh")
-    expected=$(echo -e "26\n85\n21\n94\n68\n60\n99\n31\n10\n98\n" | bash -c ""$script_dirS"/solutions/greatest-of-all.sh")
-    diff <(echo "$submitted") <(echo "$expected")
-    submitted=$(echo -e "152\n485\n569\n611\n871\n551\n984\n895\n285\n989\n" | bash -c ""$script_dirS"/student/greatest-of-all.sh")
-    expected=$(echo -e "152\n485\n569\n611\n871\n551\n984\n895\n285\n989\n" | bash -c ""$script_dirS"/solutions/greatest-of-all.sh")
-    diff <(echo "$submitted") <(echo "$expected")
-    submitted=$(echo -e "152\n10001\n569" | bash -c ""$script_dirS"/student/greatest-of-all.sh")
-    expected=$(echo -e "152\n10001\n569" | bash -c ""$script_dirS"/solutions/greatest-of-all.sh")
-    diff <(echo "$submitted") <(echo "$expected")
-    submitted=$(echo -e "152\n485\nalpha\n" | bash -c ""$script_dirS"/student/greatest-of-all.sh")
-    expected=$(echo -e "152\n485\nalpha\n" | bash -c ""$script_dirS"/solutions/greatest-of-all.sh")
-    diff <(echo "$submitted") <(echo "$expected")
-    submitted=$(echo -e "152\n485\n-45\n45\n" | bash -c ""$script_dirS"/student/greatest-of-all.sh")
-    expected=$(echo -e "152\n485\n-45\n45" | bash -c ""$script_dirS"/solutions/greatest-of-all.sh")
+    submitted=$(echo -e $1 | bash "./student/greatest-of-all.sh")
+    expected=$(echo -e $1 | bash "./solutions/greatest-of-all.sh")
     diff <(echo "$submitted") <(echo "$expected")
+    if [ $? != 0 ]
+	then
+		exit 1
+	fi
 }
 
-challenge
+challenge "0\n3\n2\n5\n7\n1\n4\n9\n8\n6\n10"
+
+challenge "26\n85\n21\n94\n68\n60\n99\n31\n10\n98\n"
+
+challenge "152\n485\n569\n611\n871\n551\n984\n895\n285\n989\n"
+
+challenge "152\n10001\n569"
+
+challenge "152\n485\nalpha\n"
+
+challenge "152\n485\n-45\n45\n"