diff --git a/test/tc_adj_to_distance.rb b/test/tc_adj_to_distance.rb
new file mode 100644
index 0000000..9ec60b5
--- /dev/null
+++ b/test/tc_adj_to_distance.rb
@@ -0,0 +1,24 @@
+require 'igraph'
+
+g = IGraph.new(['A','B','A','C','A','D','C','D'],false)
+
+adj = g.get_adjacency(2)
+g.vcount.times do |k|
+  adj[k][k] = 1
+end
+
+dis = Array.new(4){|i| Array.new(4)}
+
+dis.each_with_index do |row,i|
+  row.each_with_index do |cell,j|
+    cij = 0
+    g.vcount.times do |k|
+      puts "#{i} #{j} #{k}"
+      cij += adj[i][k] * adj[j][k]
+    end
+    dis[i][j] = 10 - cij
+  end
+end
+
+p adj
+p dis
diff --git a/test/tc_dijkstra.rb b/test/tc_dijkstra.rb
new file mode 100644
index 0000000..cc840f9
--- /dev/null
+++ b/test/tc_dijkstra.rb
@@ -0,0 +1,11 @@
+require 'test/unit'
+require 'igraph'
+
+Infinity = 1.0/0
+
+class TestGraph < Test::Unit::TestCase
+   def test_dijkstra
+     g = IGraph.new([1,2,3,4],false)
+     assert_equal [[0,1.5,Infinity,Infinity]], g.dijkstra_shortest_paths([1],[1.5,2.5],IGraph::OUT)
+   end
+ end
diff --git a/test/tc_independent_vertex_sets.rb b/test/tc_independent_vertex_sets.rb
new file mode 100644
index 0000000..5f576c1
--- /dev/null
+++ b/test/tc_independent_vertex_sets.rb
@@ -0,0 +1,21 @@
+require 'test/unit'
+require 'igraph'
+
+class TestGraph < Test::Unit::TestCase
+  def test_independent_vertex_sets
+    g = IGraph.new([1,2,3,4],true)
+    assert_equal [[1,3],[1,4],[2,3],[2,4]], g.independent_vertex_sets(2,0)
+  end
+  def test_largest_independent_vertex_sets
+    g = IGraph.new([1,2,3,4,1,5],true)
+    assert_equal [[2,3,5],[2,4,5]], g.largest_independent_vertex_sets
+  end
+  def test_maximal_independent_vertex_sets
+    g = IGraph.new([1,2,3,4],true)
+    assert_equal [[1,3],[1,4],[2,3],[2,4]], g.maximal_independent_vertex_sets
+  end
+  def test_independence_number
+    g = IGraph.new([1,2,3,4],true)
+    assert_equal 2, g.independence_number
+  end
+end
diff --git a/test/tc_isomorphic.rb b/test/tc_isomorphic.rb
new file mode 100644
index 0000000..b9f097e
--- /dev/null
+++ b/test/tc_isomorphic.rb
@@ -0,0 +1,33 @@
+require 'test/unit'
+require 'igraph'
+
+class TestGraph < Test::Unit::TestCase
+  def test_isomorphic
+    g = IGraph.new([1,2,3,4],false)
+    h = IGraph.new([5,6,7,8],false)
+    assert_equal true, g.isomorphic(h)
+    assert_equal true, h.isomorphic(g)
+  end
+  def test_isomorphic_vf2
+    g = IGraph.new([1,2,3,4],false)
+    h = IGraph.new([5,6,7,8],false)
+    assert_equal true, g.isomorphic_vf2(h)
+    assert_equal true, h.isomorphic_vf2(g)
+  end
+  def test_isoclass
+    g = IGraph.new([1,2,3,4],false)
+    h = IGraph.new([5,6,7,8],false)
+    assert g.isoclass >= 0 and g.isoclass <= 11
+    assert_equal h.isoclass, g.isoclass
+  end
+  def test_isoclass_subgraph
+    g = IGraph.new([1,2,3,4],false)
+    assert g.isoclass_subgraph([1,2,3]) >= 0 and g.isoclass <= 4
+    assert_equal g.isoclass_subgraph([1,2,3]), g.isoclass_subgraph([2,3,4])
+  end
+  def test_igraph_isoclass_create
+    g = IGraph.new([1,2,3,4],false)
+    h = IGraph.isoclass_create(4,g.isoclass,false)
+    assert_equal g.isoclass, h.isoclass
+  end
+end
diff --git a/test/tc_motif.rb b/test/tc_motif.rb
new file mode 100644
index 0000000..c30212f
--- /dev/null
+++ b/test/tc_motif.rb
@@ -0,0 +1,19 @@
+require 'test/unit'
+require 'igraph'
+
+class TestGraph < Test::Unit::TestCase
+  def test_motifs_randesu
+    g = IGraph.new(['A','B','C','D','A','C'],false)
+    hist = g.motifs_randesu(3,[0,0,0])
+    assert_equal [0,0,2,0], hist
+  end
+  def test_motifs_randesu_no
+    g = IGraph.new(['A','B','C','D','A','C'],false)
+    assert_equal 2, g.motifs_randesu_no(3,[0,0,0])    
+  end
+  def test_motifs_randesu_estimate
+    g = IGraph.new(['A','B','C','D','A','C'],false)
+    assert_equal 2, g.motifs_randesu_estimate(3,[0,0,0],4,nil)
+    assert_equal 2, g.motifs_randesu_estimate(3,[0,0,0],0,['A','B','C','D'])
+  end 
+end