test(grades) fix stderror testing scenarios for grades exercise

sh/tests/grades_test.sh

@@ -4,22 +4,35 @@ IFS='
 '
 script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)
 
+
 challenge() {
 
     input="${@: -1}"
     args=${@:1:$#-1}
 
-    submitted=$(
-        bash -c ""$script_dirS"/student/grades.sh $args" <<EOF
+bash -c ""$script_dirS"/student/grades.sh $args" 2> grades_submitted_errors 1>grades_submitted_output <<EOF
 $input
 EOF
-    )
-    expected=$(
-        bash -c ""$script_dirS"/solutions/grades.sh $args" <<EOF
+    grades_submitted_status=$?
+
+bash -c ""$script_dirS"/solutions/grades.sh $args" 2> grades_expected_errors 1>grades_expected_output <<EOF
 $input
 EOF
-    )
-    diff <(echo "$submitted") <(echo "$expected")
+    grades_expected_status=$?
+
+    diff <(cat grades_submitted_output) <(cat grades_expected_output)
+
+    if [ $? != 0 ]; then
+        exit 1
+    fi
+
+    diff <(cat grades_submitted_errors) <(cat grades_expected_errors)
+
+    if [ $? != 0 ]; then
+        exit 1
+    fi
+
+    diff <(echo $grades_expected_status) <(echo $grades_submitted_status)
 
     if [ $? != 0 ]; then
         exit 1

sh/tests/solutions/grades.sh

@@ -4,7 +4,7 @@ num_students=$1
 declare -a students
 
 if [ $# -ne 1 ]; then
-    echo "Error: expect 1 argument only!"
+    echo "Error: expect 1 argument only!" >/dev/stderr
     exit 1
 fi
 
@@ -14,7 +14,7 @@ for ((i = 0; i < num_students; i++)); do
     students+=("$name $grade")
 
     if [ $(expr "$grade" \> 100) -eq 1 ] || ! [[ "$grade" =~ ^[0-9]+$ ]]; then
-        echo "Error: The grade '$grade' is not a valid input. Only numerical grades between 0 and 100 are accepted."
+        echo "Error: The grade '$grade' is not a valid input. Only numerical grades between 0 and 100 are accepted." >/dev/stderr
         exit 1
     fi
 done