class TestDot

# File test/dot_test.rb, line 8
def assert_match(dot, pattern)
  assert(!(dot =~ pattern).nil?, "#{dot} doesn't match #{pattern}")
end

# File test/dot_test.rb, line 12
def test_to_dot_digraph
  graph = RGL::DirectedAdjacencyGraph["a", "b"]

  begin
    dot   = graph.to_dot_graph.to_s

    first_vertex_id = "a"
    second_vertex_id = "b"

    assert_match(dot, /\{[^}]*\}/) # {...}
    assert_match(dot, /#{first_vertex_id}\s*\[/)  # node 1
    assert_match(dot, /label\s*=\s*a/)            # node 1 label
    assert_match(dot, /#{second_vertex_id}\s*\[/) # node 2
    assert_match(dot, /label\s*=\s*b/)            # node 2 label
    assert_match(dot, /#{first_vertex_id}\s*->\s*#{second_vertex_id}/) # edge
  rescue
    puts "Graphviz not installed?"
  end
end

# File test/dot_test.rb, line 32
def test_to_dot_graph
  graph = RGL::AdjacencyGraph["a", "b"]
  def graph.vertex_label(v)
    "label-"+v.to_s
  end

  def graph.vertex_id(v)
    "id-"+v.to_s
  end
  begin
    graph.write_to_graphic_file
  rescue
    puts "Graphviz not installed?"
  end
end