dot_to_qt_test.py

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#!/usr/bin/env python
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import unittest

from qt_dotgraph.dot_to_qt import DotToQtGenerator, get_unquoted
from python_qt_binding.QtWidgets import QApplication
import sys
import subprocess


def check_x_server():
    p = subprocess.Popen(sys.executable, stdin=subprocess.PIPE)
    p.stdin.write('from python_qt_binding.QtWidgets import QApplication\n')
    p.stdin.write('app = QApplication([])\n')
    p.stdin.close()
    p.communicate()

    print(p.returncode)

    return p.returncode == 0



class DotToQtGeneratorTest(unittest.TestCase):

    DOT_CODE = '''
    digraph graph_name {
        graph [bb="0,0,154,108",
            rank=same
        ];
        node [label="\N"];
        subgraph cluster_foo {
            graph [bb="1,1,100,101",
                label=cluster_foo
            ];
        }
        foo      [height=0.5,
            label=foo,
            pos="77,90",
            shape=box,
            width=0.75];
        bar      [height=0.5,
            label=barbarbarbarbarbarbarbar,
            pos="77,18",
            shape=box,
            width=2.25];
        foo -> bar       [pos="e,77,36.104 77,71.697 77,63.983 77,54.712 77,46.112"];
    }
    '''

    _Q_APP = None

    def __init__(self, *args):
        super(DotToQtGeneratorTest, self).__init__(*args)
        # needed for creation of QtGraphic items in NodeItem.__init__
        if DotToQtGeneratorTest._Q_APP is None:
            if check_x_server():
                DotToQtGeneratorTest._Q_APP = QApplication([])

    def test_simple_integration(self):
        if DotToQtGeneratorTest._Q_APP is None:
            raise unittest.case.SkipTest

        (nodes, edges) = DotToQtGenerator().dotcode_to_qt_items(
            DotToQtGeneratorTest.DOT_CODE, 1)
        self.assertEqual(3, len(nodes))  # cluster_foo, foo and bar
        self.assertEqual(1, len(edges))  # foo -> bar

    def test_label_sizes(self):
        if DotToQtGeneratorTest._Q_APP is None:
            raise unittest.case.SkipTest

        (nodes, edges) = DotToQtGenerator().dotcode_to_qt_items(DotToQtGeneratorTest.DOT_CODE, 1)

        self.longMessage = True
        for name, node in nodes.items():
            shape_rect = node._graphics_item.sceneBoundingRect()
            label_rect = node._label.sceneBoundingRect()
            self.assertLess(
                label_rect.width(),
                shape_rect.width(),
                "Label text for '%s' is wider than surrounding shape." % name)
            self.assertLess(
                label_rect.height(),
                shape_rect.height(),
                "Label text for '%s' is higher than surrounding shape." % name)

    def test_unquoted(self):
        self.assertEqual("foo", get_unquoted({'bar': 'foo'}, 'bar'))