graph_drawing/tests/test_node.py

import unittest
import doctest

import node
from node import Node, Leaf
from line import generate_line


class TestNode(unittest.TestCase):

    def test_doctest(self):
        self.assertEqual(doctest.testmod(m=node)[0], 0)

    def setUp(self):
        self.l0 = Leaf('leaf 1')
        self.l1 = Leaf('leaf 2')
        self.node = Node('node', self.l0, self.l1)

    def test_getitem(self):
        assert self.node[0] == self.l0

    def test_setitem(self):
        self.node[0] = Leaf('leaf 3')
        assert self.node[0] != self.l0

    def test_iter(self):
        s = ''

        for leaf in self.node:
            s += leaf.title()

        assert s == 'leaf 1leaf 2'

    def test_len(self):
        assert len(self.node) == 2

    def test_title(self):
        assert self.node.title() == 'node'
        assert self.l0.title() == 'leaf 1'

    def test____str__(self):
        l1 = Leaf(1)
        self.assertEqual(str(l1), '1')
        l1 = -l1
        self.assertEqual(str(l1), '-1')
        l1 = -l1
        self.assertEqual(str(l1), '--1')

    def test_kwargs_constructor(self):
        l1, l2 = Leaf(1), Leaf(2)
        self.assertEqual(Node('+', l1, l2, negated=1).negated, 1)

        self.assertEqual(Leaf(1, negated=2).negated, 2)

    def test_negated_int_constructor(self):
        self.assertEquals(-Leaf(2), Leaf(-2))