CSC/ECE 517 Spring 2018 E1814 Write unit tests for collusion cycle.rb

Introduction

Expertiza Background

Expertiza is an opensource web application maintained by students and faculty members of North Carolina State University. Through it students can submit and peer-review learning objects (articles, code, web sites, etc). More information on http://wiki.expertiza.ncsu.edu/index.php/Expertiza_documentation.

Project Description

Collusion_cycle.rb is a part of the Expertiza project used to calculate potential collusion cycles between peer reviews. Our purpose is to write corresponding unit tests (collusion_cycle_spec.rb) for it.

Project Details

Model introduction

Model purpose

The file collusion_cycle.rb in app/models is used to calculate potential collusion cycles between peer reviews which means two assignment participants are accidentally assigned to review each other's assignments directly or through a so-called collusion cycle. For example, if participant A was reviewed by participant B, participant B was reviewed by participant C, participant C was reviewed by participant A and all the reviews were indeed finished, then a three nodes cycle exists. Cases including two nodes, three nodes and four nodes have been covered in collusion_cycle.rb.

Functions introduction

4. cycle_similarity_score(cycle)

  def cycle_similarity_score(cycle)
    similarity_score = 0.0
    count = 0.0
    for pivot in 0...cycle.size - 1 do
      pivot_score = cycle[pivot][1]
      for other in pivot + 1...cycle.size do
        similarity_score += (pivot_score - cycle[other][1]).abs
        count += 1.0
      end
    end
    similarity_score /= count unless count == 0.0
    similarity_score
  end

Test Description

Cycle Detection

1. two-node

2. three node

3. four node

Scores

1. similarity

2. deviation

Coverage Result

Reference

1. rspec *2

2. expertiza *3