graph test added

lib/exstreme/graph.ex

@@ -20,7 +20,8 @@ defmodule Exstreme.Graph do
   @spec count_connections(t) :: non_neg_integer
   def count_connections(%Graph{connections: connections}) do
     connections
-    |> Map.keys
+    |> Map.values
+    |> List.flatten
     |> Enum.count
   end
 

test/exstreme/graph_test.exs

@@ -4,4 +4,16 @@ defmodule Exstreme.GraphTest do
   alias Exstreme.Graph
   doctest Exstreme.Graph
 
+  test "graph with many nodes has 7 nodes and 7 connections" do
+    assert Graph.count_nodes(graph_many_nodes) == 7
+    assert Graph.count_connections(graph_many_nodes) == 7
+  end
+
+  test "connection stats for graph with many nodes" do
+    assert Graph.connections_stats(graph_many_nodes) == %{begin: 1, connected: 5, end: 1}
+  end
+
+  test "the start node is n1" do
+    assert Graph.find_start_node(graph_many_nodes) == [:n1]
+  end
 end