def test_add_node_link(self):
g = GraphBackend()
g.add_hub('foo')
with self.assertRaises(Exception) as exc:
g.link('foo', 'foo')
self.assertEqual(
exc.exception.message,
"Hub can't be linked to itself"
)
g.link('foo', 'bar')
self.assertFalse(g.is_hub('bar'))
self.assertEqual(g.hubs(), set(['foo']))
self.assertEqual(g.links('foo'), set(['bar']))
self.assertEqual(g.hub_links('foo'), set(['bar']))
with self.assertRaises(Exception) as exc:
g.hub_links('bar')
self.assertEqual(
exc.exception.message,
"Hub 'bar' does not exist"
)
with self.assertRaises(Exception) as exc:
g.link('foo', 'bar')
self.assertEqual(
exc.exception.message,
"Hub 'foo' is already connected to node 'bar'"
)
def test_add_hub_link(self):
g = GraphBackend().add_hub('foo', 'bar').link('foo', 'bar')
self.assertTrue(g.is_hub('foo'))
self.assertTrue(g.is_hub('bar'))
self.assertEquals(g.links('foo'), set(['bar']))
self.assertEquals(g.hub_links('foo'), set(['bar']))
self.assertEquals(g.links('bar'), set())
self.assertEquals(g.hub_links('bar'), set())
with self.assertRaises(Exception) as exc:
g.link('foo', 'bar')
self.assertEquals(exc.exception.message,
"Hub 'foo' is already connected to node 'bar'")
g.link('bar', 'foo')
self.assertEquals(g.links('foo'), set(['bar']))
self.assertEquals(g.hub_links('foo'), set(['bar']))
self.assertEquals(g.links('bar'), set(['foo']))
self.assertEquals(g.hub_links('bar'), set(['foo']))
def test_empty_graph(self):
""" Test properties of an empty graph """
g = GraphBackend()
self.assertEqual(g.hubs(), set())
with self.assertRaises(Exception) as exc:
g.unlink('foo', 'bar')
self.assertEqual(exc.exception.message, "Hub 'foo' does not exist")
with self.assertRaises(Exception) as exc:
g.links('foo')
self.assertEqual(exc.exception.message, "Unknown node 'foo'")
with self.assertRaises(Exception) as exc:
g.hub_links('foo')
self.assertEqual(exc.exception.message, "Hub 'foo' does not exist")
self.assertFalse(g.is_hub('foo'))
# try to link an unknown hub to an unknown node
with self.assertRaises(Exception) as exc:
g.link('foo', 'bar')
self.assertEqual(exc.exception.message, "Hub 'foo' does not exist")
def test_empty_graph(self):
""" Test properties of an empty graph """
g = GraphBackend()
self.assertEqual(g.hubs(), set())
with self.assertRaises(Exception) as exc:
g.unlink('foo', 'bar')
self.assertEqual(exc.exception.message, "Hub 'foo' does not exist")
with self.assertRaises(Exception) as exc:
g.links('foo')
self.assertEqual(exc.exception.message, "Unknown node 'foo'")
with self.assertRaises(Exception) as exc:
g.hub_links('foo')
self.assertEqual(exc.exception.message, "Hub 'foo' does not exist")
self.assertFalse(g.is_hub('foo'))
# try to link an unknown hub to an unknown node
with self.assertRaises(Exception) as exc:
g.link('foo', 'bar')
self.assertEqual(exc.exception.message, "Hub 'foo' does not exist")
def test_add_hub_link(self):
g = GraphBackend().add_hub('foo', 'bar').link('foo', 'bar')
self.assertTrue(g.is_hub('foo'))
self.assertTrue(g.is_hub('bar'))
self.assertEquals(g.links('foo'), set(['bar']))
self.assertEquals(g.hub_links('foo'), set(['bar']))
self.assertEquals(g.links('bar'), set())
self.assertEquals(g.hub_links('bar'), set())
with self.assertRaises(Exception) as exc:
g.link('foo', 'bar')
self.assertEquals(
exc.exception.message,
"Hub 'foo' is already connected to node 'bar'"
)
g.link('bar', 'foo')
self.assertEquals(g.links('foo'), set(['bar']))
self.assertEquals(g.hub_links('foo'), set(['bar']))
self.assertEquals(g.links('bar'), set(['foo']))
self.assertEquals(g.hub_links('bar'), set(['foo']))
def test_add_node_link(self):
g = GraphBackend()
g.add_hub('foo')
with self.assertRaises(Exception) as exc:
g.link('foo', 'foo')
self.assertEqual(exc.exception.message,
"Hub can't be linked to itself")
g.link('foo', 'bar')
self.assertFalse(g.is_hub('bar'))
self.assertEqual(g.hubs(), set(['foo']))
self.assertEqual(g.links('foo'), set(['bar']))
self.assertEqual(g.hub_links('foo'), set(['bar']))
with self.assertRaises(Exception) as exc:
g.hub_links('bar')
self.assertEqual(exc.exception.message, "Hub 'bar' does not exist")
with self.assertRaises(Exception) as exc:
g.link('foo', 'bar')
self.assertEqual(exc.exception.message,
"Hub 'foo' is already connected to node 'bar'")
def test_remove_hub_with_linked_hubs(self):
g = GraphBackend().add_hub('h1', 'h2', 'h3')\
.link('h1', 'h2').link('h1', 'h3').link('h2', 'h3')
self.assertEqual(g.hub_links('h1'), set(['h2', 'h3']))
self.assertEqual(g.hub_links('h2'), set(['h3']))
self.assertEqual(g.hub_links('h3'), set())
g.remove_hub('h1') # remove node because nobody follows it
self.assertFalse('h1' in g.hubs())
with self.assertRaises(Exception) as exc:
g.links('h1')
self.assertEqual(exc.exception.message, "Unknown node 'h1'")
self.assertEqual(g.links('h2'), set(['h3']))
self.assertEqual(g.links('h3'), set())
with self.assertRaises(Exception) as exc:
g.hub_links('h1')
self.assertEqual(exc.exception.message, "Hub 'h1' does not exist")
g.unlink('h2', 'h3')
self.assertTrue('h2' in g.hubs())
self.assertTrue('h3' in g.hubs())
self.assertEqual(g.links('h2'), set())
self.assertEqual(g.links('h3'), set())
def test_remove_hub_with_linked_hubs(self):
g = GraphBackend().add_hub('h1', 'h2', 'h3')\
.link('h1', 'h2').link('h1', 'h3').link('h2', 'h3')
self.assertEqual(g.hub_links('h1'), set(['h2', 'h3']))
self.assertEqual(g.hub_links('h2'), set(['h3']))
self.assertEqual(g.hub_links('h3'), set())
g.remove_hub('h1') # remove node because nobody follows it
self.assertFalse('h1' in g.hubs())
with self.assertRaises(Exception) as exc:
g.links('h1')
self.assertEqual(exc.exception.message, "Unknown node 'h1'")
self.assertEqual(g.links('h2'), set(['h3']))
self.assertEqual(g.links('h3'), set())
with self.assertRaises(Exception) as exc:
g.hub_links('h1')
self.assertEqual(exc.exception.message, "Hub 'h1' does not exist")
g.unlink('h2', 'h3')
self.assertTrue('h2' in g.hubs())
self.assertTrue('h3' in g.hubs())
self.assertEqual(g.links('h2'), set())
self.assertEqual(g.links('h3'), set())
def test_add_hub(self):
g = GraphBackend()
g.add_hub('foo')
self.assertTrue(g.is_hub('foo'))
self.assertEqual(g.hubs(), set(['foo']))
self.assertEqual(g.links('foo'), set())
self.assertEqual(g.hub_links('foo'), set())
with self.assertRaises(Exception) as exc:
g.add_hub('foo')
self.assertEqual(exc.exception.message, "Hub 'foo' already exists")
with self.assertRaises(Exception) as exc:
g.unlink('foo', 'bar')
self.assertEqual(exc.exception.message,
"Hub 'foo' is not connected to node 'bar'")
def test_add_hub(self):
g = GraphBackend()
g.add_hub('foo')
self.assertTrue(g.is_hub('foo'))
self.assertEqual(g.hubs(), set(['foo']))
self.assertEqual(g.links('foo'), set())
self.assertEqual(g.hub_links('foo'), set())
with self.assertRaises(Exception) as exc:
g.add_hub('foo')
self.assertEqual(
exc.exception.message,
"Hub 'foo' already exists"
)
with self.assertRaises(Exception) as exc:
g.unlink('foo', 'bar')
self.assertEqual(
exc.exception.message,
"Hub 'foo' is not connected to node 'bar'"
)