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[graph.njae.git] / spec / graph / edge_spec.rb~

diff --git a/spec/graph/edge_spec.rb~ b/spec/graph/edge_spec.rb~
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+require 'spec_helper'
+
+module Graph
+  describe Edge do
+    let (:e) { Edge.new }
+    describe "#initialize" do
+      it "creates an empty edge" do
+        e = Edge.new
+        e.connections.should be_empty
+      end
+    end # #initialize
+    
+    describe "adds attribues" do
+      it "adds then reports arbitrary attributes" do
+        e.score = 15
+        e.score.should == 15
+      end
+    end # adds attributes
+    
+    describe "#<<" do
+      it "adds a new vertex to an edge (with a connection)" do
+        e.connections.should be_empty
+        v1 = Vertex.new
+        v2 = Vertex.new
+        e << v1
+        e.should have(1).connections
+        e.should have(1).vertices
+        e.vertices.should include(v1)
+        e << v2
+        e.should have(2).connections
+        e.should have(2).vertices
+        e.vertices.should include(v1)
+        e.vertices.should include(v2)
+      end
+      
+      it "adds several vertices to an edge" do
+        e.connections.should be_empty
+        v1 = Vertex.new
+        v2 = Vertex.new
+        e << v1 << v2
+        e.vertices.should include(v1)
+        e.vertices.should include(v2)
+        e.should have(2).vertices
+      end
+
+      it "adds a self-loop" do
+        e.connections.should be_empty
+        v1 = Vertex.new
+        e << v1 << v1
+        e.vertices.should include(v1)
+        e.should have(2).vertices
+        e.vertices.uniq.length.should == 1
+      end
+    end # #<<
+    
+    describe "connection_at" do
+      it "returns the connection that links to a vertex" do
+        e.connections.should be_empty
+        v1 = Vertex.new
+        v2 = Vertex.new
+        e << v1 << v2
+        
+        e.connection_at(v1).end.should be v1
+        e.connection_at(v2).end.should be v2
+      end
+      
+      it "returns nil if there is no connection to that vertex" do
+        e.connections.should be_empty
+        v1 = Vertex.new
+        v2 = Vertex.new
+        v3 = Vertex.new
+        e << v1 << v2
+        
+        e.connection_at(v3).should be nil
+      end
+    end # #connection_at
+  end # Edge
+  
+  describe Connection do
+    let (:c) {Connection.new }
+    
+    describe "adds attribues" do
+      it "adds then reports arbitrary attributes" do
+        c.score = 15
+        c.score.should == 15
+      end
+    end # adds attributes
+  end # Connection
+  
+end
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