pygraphviz_factory_test.py

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#!/usr/bin/env python
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import unittest
from qt_dotgraph.pygraphvizfactory import PygraphvizFactory

class PygraphvizFactoryTest(unittest.TestCase):

    def test_get_graph(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        self.assertEquals('same', g.graph_attr['rank'])
        self.assertTrue(g.is_directed())

    def test_add_node(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        fac.add_node_to_graph(g, 'foo')
        self.assertEqual(1, len(g.nodes()))
        self.assertEqual('foo', g.nodes()[0].get_name())
        self.assertEqual('foo', g.nodes()[0].attr['label'])

    def test_add_node_escape_name(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        fac.add_node_to_graph(g, 'graph')
        self.assertEqual(1, len(g.nodes()))
        self.assertEqual('graph', g.nodes()[0].get_name())
        self.assertEqual('graph', g.nodes()[0].attr['label'])
        
    def test_add_edge(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        fac.add_node_to_graph(g, 'foo')
        fac.add_node_to_graph(g, 'bar')
        fac.add_edge_to_graph(g, 'foo', 'bar')
        self.assertEqual(2, len(g.nodes()))
        self.assertEqual(1, len(g.edges()))
        self.assertEqual('foo', g.edges()[0][0])
        self.assertEqual('bar', g.edges()[0][1])

    def test_add_subgraph(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        fac.add_subgraph_to_graph(g, 'foo')
        self.assertEqual(1, len(g.subgraphs()))
        self.assertEqual('cluster_foo', g.subgraphs()[0].get_name())
        self.assertEqual('foo', g.subgraphs()[0].graph_attr['label'])

    def test_add_subgraph_escape_name(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        fac.add_subgraph_to_graph(g, 'graph')
        self.assertEqual(1, len(g.subgraphs()))
        self.assertEqual('cluster_graph', g.subgraphs()[0].get_name())
        self.assertEqual('graph', g.subgraphs()[0].graph_attr['label'])

    def test_create_dot(self):
        fac = PygraphvizFactory()
        g = fac.get_graph()
        fac.add_node_to_graph(g, 'foo')
        fac.add_node_to_graph(g, 'edge')
        fac.add_edge_to_graph(g, 'foo', 'edge')
        fac.add_subgraph_to_graph(g, 'graph')
        snippets = ['strict digraph {\n\tgraph',
                    'foo',
                    'label=foo',
                    '"edge"',
                    'label="edge"',
                    'foo -> "edge"']
        result = fac.create_dot(g)
        for sn in snippets:
            self.assertTrue(sn in result, '%s \nmissing in\n %s' % (sn, result))