Tutorial: Moodle VPL -- Testing a Bash Script

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--D. Thiebaut (talk) 21:19, 23 March 2017 (EDT)



Contents

MoodleVPLLogo.png



Moodle VPL Tutorials



This tutorial illustrates how to setup a VPL activity that tests a Bash script that takes as input an integer and acts as a teller machine, returning the number of 20s, number of 10s, number of 5s, and number of 1s contained in the initial integer. The tutorial illustrates how to setup evaluation of the program so that the student will get 0 or 100 points depending on whether his/her program output is correct or not.


Setup


  • Moodle Version 2.7 + (Build: 20140529)
  • VPL Version 3.0.1
  • For details on how Moodle and VPL were installed, go to this page.


Step-by-Step Instructions


  • Login as Instructor for course where Python test is to be added
  • Turn editing ON

Add New Activity

  • Add new activity
  • Set the following fields:
    • Name: Teller Test
    • Short description: Teller Machine Bash script
    • Full description: You need to write a bash script that will break down an integer amount into 20s, 10s, 5s, and 1s. The integer amount is passed on the command line.
    • Submission period: pick today's date for Available from and a date that is in your future for Due date, and click on Enable
    • Submission restrictions/Max number of files: 1, and leave all the other fields with their default values.
    • Grade: Use Point, 100, and pick the category of grades this should fall in (You need to create categories first, i.e. quizzes, homework, exam, etc.)
    • Save and display


VPL Administration


Setup the VPL system to test the students programs


  • Test cases: None needed
  • Execution options: Run: Yes, Debug: No, Evaluate: Yes, Evaluate just on submission: No, Automatic Grade: Yes
  • Requested files: teller.sh. Just enter this file name, and nothing in the edit window. Click on Save.


Testing as Admin


  • Test activity. Click on Edit and enter this simple program:


#! /bin/bash


amount=$1

no20s=$( expr $amount / 20 )
amount=$( expr  $amount % 20 )
no10s=$( expr  $amount / 10 )
amount=$( expr  $amount % 10 )
no5s=$( expr  $amount / 5 )
no1s=$( expr  $amount % 5 )

echo ""
echo $no20s
echo $no10s
echo $no5s
echo $no1s


  • Save
  • Click on Run
  • Close the console
  • Click on Evaluate
Verify that you get the message shown below, indicating that the program runs correctly and gets full mark.
TEST 1
Congrats, your output is correct.
--------------------------------.
0
0
0
0
TEST 2
Congrats, your output is correct.
--------------------------------.
3
1
1
2
TEST 3
Congrats, your output is correct.
--------------------------------.
1
1
1
1


vpl_run


#! /bin/bash

cat   > vpl_execution <<EOF
#! /bin/bash

chmod a+rx teller.sh

read var1
./teller.sh \${var1}

EOF


chmod +x vpl_execution


vpl_evaluate


#! /bin/bash
# D. Thiebaut
# Smith College
# vpl_evaluate.sh script looping through several tests, each test with
# its own input file and its own expected output file.  The output of the
# student program is tested against the expected output file.
#


cat > vpl_execution <<EEOOFF
#! /bin/bash
 
# --- student program being tested ---
prog1=teller.sh

# --- compile student program ---
chmod a+x \${prog1}

# --- create test input files ---
cat > data1.txt <<EOF
0
EOF

cat > data2.txt <<EOF
77
EOF
   
cat > data3.txt <<EOF
36
EOF

#--- create expected outputs, one for each input file above ---
#--- (make sure no extra blank lines)                ---
cat > data1.out <<EOF
0
0
0
0
EOF

cat > data2.out <<EOF
3
1
1
2
EOF

cat > data3.out <<EOF
1
1
1
1
EOF

for i in 1 2 3  ; do
   echo "Comment :=>>-TEST \$i"

   # ==============================================
   # TEST i
   # ==============================================
   #--- run program, capture output, display to student ---
   command="head -n 1 data\${i}.txt"
   input=\$( \$command )
   ./\${prog1} \${input}  &> user.out
   cp user.out user.out.org

   #--- remove non numbers and non minus---
   cat user.out | sed 's/[^0-9\ -]*//g' > dummy.out
   mv dummy.out user.out
 
   #--- remove multiple spaces ---
   cat user.out | sed 's/  */ /g' > dummy.out
   mv dummy.out user.out

   #--- remove blank lines ---
   cat user.out | sed '/^\s*$/d' > dummy.out
   mv dummy.out user.out

   #--- compute difference ---
   diff -y -w --ignore-all-space user.out data\${i}.out > diff.out
   #echo "----- diff.out ------"
   #cat diff.out
   #echo "---------------------"
   diff -y -w --ignore-all-space user.out data\${i}.out > diff.out

   #--- reject if different ---
   if ((\$? > 0)); then
      echo "Comment :=>>- Your output is incorrect."

      #--- display test file ---
      echo "Comment :=>>- Your program tested with:"
      echo "<|--"
      cat data\${i}.txt
      echo "--|>"

      echo "Comment :=>> ---------------"
      echo "Comment :=>>- Your output:"
      echo "Comment :=>> ---------------"
      echo "<|--"
      cat user.out.org
      echo "--|>"
      echo ""
      echo "Comment :=>> ---------------"
      echo "Comment :=>>- Expected output (only the numbers): "
      echo "Comment :=>> ---------------"
      echo "<|--"
      cat data\${i}.out
      echo "--|>"
   
      #--- consolation grade ---  
      grade=\$((grade+10))

      # --------------------- REWARD IF CORRECT OUTPUT -----------------
   else
      #--- good output ---
      echo "Comment :=>>- Congrats, your output is correct."
      echo "Comment :=>> --------------------------------."
      echo "<|--"
      cat user.out.org
      echo "--|>"
      grade=\$((grade+100/i))
   fi
done
if (( grade > 100 )); then
   grade=100
fi
echo "Grade :=>> \$grade"

EEOOFF


 
chmod +x vpl_execution





This concludes this tutorial