spec/graph/edge_spec.rb~

   1 require 'spec_helper'
   2
   3 module Graph
   4   describe Edge do
   5     let (:e) { Edge.new }
   6     describe "#initialize" do
   7       it "creates an empty edge" do
   8         e = Edge.new
   9         e.connections.should be_empty
  10       end
  11     end # #initialize
  12
  13     describe "adds attribues" do
  14       it "adds then reports arbitrary attributes" do
  15         e.score = 15
  16         e.score.should == 15
  17       end
  18     end # adds attributes
  19
  20     describe "#<<" do
  21       it "adds a new vertex to an edge (with a connection)" do
  22         e.connections.should be_empty
  23         v1 = Vertex.new
  24         v2 = Vertex.new
  25         e << v1
  26         e.should have(1).connections
  27         e.should have(1).vertices
  28         e.vertices.should include(v1)
  29         e << v2
  30         e.should have(2).connections
  31         e.should have(2).vertices
  32         e.vertices.should include(v1)
  33         e.vertices.should include(v2)
  34       end
  35
  36       it "adds several vertices to an edge" do
  37         e.connections.should be_empty
  38         v1 = Vertex.new
  39         v2 = Vertex.new
  40         e << v1 << v2
  41         e.vertices.should include(v1)
  42         e.vertices.should include(v2)
  43         e.should have(2).vertices
  44       end
  45
  46       it "adds a self-loop" do
  47         e.connections.should be_empty
  48         v1 = Vertex.new
  49         e << v1 << v1
  50         e.vertices.should include(v1)
  51         e.should have(2).vertices
  52         e.vertices.uniq.length.should == 1
  53       end
  54     end # #<<
  55
  56     describe "connection_at" do
  57       it "returns the connection that links to a vertex" do
  58         e.connections.should be_empty
  59         v1 = Vertex.new
  60         v2 = Vertex.new
  61         e << v1 << v2
  62
  63         e.connection_at(v1).end.should be v1
  64         e.connection_at(v2).end.should be v2
  65       end
  66
  67       it "returns nil if there is no connection to that vertex" do
  68         e.connections.should be_empty
  69         v1 = Vertex.new
  70         v2 = Vertex.new
  71         v3 = Vertex.new
  72         e << v1 << v2
  73
  74         e.connection_at(v3).should be nil
  75       end
  76     end # #connection_at
  77   end # Edge
  78
  79   describe Connection do
  80     let (:c) {Connection.new }
  81
  82     describe "adds attribues" do
  83       it "adds then reports arbitrary attributes" do
  84         c.score = 15
  85         c.score.should == 15
  86       end
  87     end # adds attributes
  88   end # Connection
  89
  90 end