RSpec Assessment Scorer

grading_script.rb

# Will run rake in each folder, check how
# many specs failed, and output scores
# (passed specs of total specs) into 
# 'final_grades.txt' along with a note if
# 'rake' errored out.
# 
#
# Expectations:
#
# Single folder that contains one folder
# per student. The name of each of the 
# folders should be the student's name. 
# One of the folders should be named 
# 'solution' and have a 'spec' folder in
# it (this folder will be copied to all
# the student folders).
#
# Must be able to call 'rake' inside each
# student folder to run tests.
#
# This script should be placed at the same
# level as all of the student folders.
#
# Grades will be available in a file titled
# 'final_scores.txt'

require 'pp'
require 'fileutils'

PERFECT_SCORE = 19
COMMAND = "rspec"

folder_names = []
scores = {}

exclude = ["final_scores.txt", "grading_script.rb"]
names = Dir.entries('.').select do |entry| 
  # Ignore '.', '..', and any junk hidden files (e.g. .DS_Store)
  /^[a-zA-Z].*/ =~ entry && !exclude.include?(entry)
end

puts "Scoring: "
puts names

names.each do |name|
  Dir.chdir("#{name}")

  unless name == "solution"
    FileUtils.cp_r("../solution/spec", ".")
  end
  
  output = `#{COMMAND}`
  
  score_line = output.split("\n").find do |line|
    /(\d+) examples?, (\d+) failures?/ =~ line
  end

  examples, failures = score_line.split(", ").map do |line|
    line.split.first.to_i
  end

  # Checks if `rake` errored out by checking to see if the last line
  # of its output is "19 Examples, ..."
  if examples != PERFECT_SCORE
    scores[name] = 0
    puts "!!!!Error on #{name}!!!!"
    Dir.chdir("..")
    next
  end

  scores[name] = PERFECT_SCORE - failures

  Dir.chdir("..")
  puts "Scored #{name}. Score: #{scores[name]} of #{PERFECT_SCORE}"
end

puts "\n" * 5
puts "-" * 10

File.open("final_scores.txt", 'w') do |f|
  scores.each do |name, score|
    next if name == "solution"
    text = "#{name}: #{score} of #{PERFECT_SCORE}"
    text << " ERROR!!" if score == 0
    puts text
    f.puts text
  end
end

puts
puts "Scores available in 'final_scores.txt'"