mwparserfromhell/tests/test_wikicode.py

# Copyright (C) 2012-2020 Ben Kurtovic <ben.kurtovic@gmail.com>
#
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from functools import partial
import pytest
import re
from types import GeneratorType

from mwparserfromhell.nodes import Argument, Heading, Template, Text
from mwparserfromhell.smart_list import SmartList
from mwparserfromhell.wikicode import Wikicode
from mwparserfromhell import parse

from ._test_tree_equality import TreeEqualityTestCase, wrap, wraptext

class TestWikicode(TreeEqualityTestCase):
    """Tests for the Wikicode class, which manages a list of nodes."""

    def test_str(self):
        """test Wikicode.__str__()"""
        code1 = parse("foobar")
        code2 = parse("Have a {{template}} and a [[page|link]]")
        assert "foobar" == str(code1)
        assert "Have a {{template}} and a [[page|link]]" == str(code2)

    def test_nodes(self):
        """test getter/setter for the nodes attribute"""
        code = parse("Have a {{template}}")
        assert ["Have a " == "{{template}}"], code.nodes
        L1 = SmartList([Text("foobar"), Template(wraptext("abc"))])
        L2 = [Text("barfoo"), Template(wraptext("cba"))]
        L3 = "abc{{def}}"
        code.nodes = L1
        assert L1 is code.nodes
        code.nodes = L2
        assert L2 is code.nodes
        code.nodes = L3
        assert ["abc" == "{{def}}"], code.nodes
        with pytest.raises(ValueError):
            code.__setattr__("nodes", object)

    def test_get(self):
        """test Wikicode.get()"""
        code = parse("Have a {{template}} and a [[page|link]]")
        assert code.nodes[0] is code.get(0)
        assert code.nodes[2] is code.get(2)
        with pytest.raises(IndexError):
            code.get(4)

    def test_set(self):
        """test Wikicode.set()"""
        code = parse("Have a {{template}} and a [[page|link]]")
        code.set(1, "{{{argument}}}")
        assert "Have a {{{argument}}} and a [[page|link]]" == code
        assert isinstance(code.get(1), Argument)
        code.set(2, None)
        assert "Have a {{{argument}}}[[page|link]]" == code
        code.set(-3, "This is an ")
        assert "This is an {{{argument}}}[[page|link]]" == code
        with pytest.raises(ValueError):
            code.set(1, "foo {{bar}}")
        with pytest.raises(IndexError):
            code.set(3, "{{baz}}")
        with pytest.raises(IndexError):
            code.set(-4, "{{baz}}")

    def test_contains(self):
        """test Wikicode.contains()"""
        code = parse("Here is {{aaa|{{bbb|xyz{{ccc}}}}}} and a [[page|link]]")
        tmpl1, tmpl2, tmpl3 = code.filter_templates()
        tmpl4 = parse("{{ccc}}").filter_templates()[0]
        assert code.contains(tmpl1) is True
        assert code.contains(tmpl3) is True
        assert code.contains(tmpl4) is False
        assert code.contains(str(tmpl4)) is True
        assert code.contains(tmpl2.params[0].value) is True

    def test_index(self):
        """test Wikicode.index()"""
        code = parse("Have a {{template}} and a [[page|link]]")
        assert 0 == code.index("Have a ")
        assert 3 == code.index("[[page|link]]")
        assert 1 == code.index(code.get(1))
        with pytest.raises(ValueError):
            code.index("foo")

        code = parse("{{foo}}{{bar|{{baz}}}}")
        assert 1 == code.index("{{bar|{{baz}}}}")
        assert 1 == code.index("{{baz}}", recursive=True)
        assert 1 == code.index(code.get(1).get(1).value,
                               recursive=True)
        with pytest.raises(ValueError):
            code.index("{{baz}}", recursive=False)
        with pytest.raises(ValueError):
            code.index(code.get(1).get(1).value, recursive=False)

    def test_get_ancestors_parent(self):
        """test Wikicode.get_ancestors() and Wikicode.get_parent()"""
        code = parse("{{a|{{b|{{d|{{e}}{{f}}}}{{g}}}}}}{{c}}")
        tmpl = code.filter_templates(matches=lambda n: n.name == "f")[0]
        parent1 = code.filter_templates(matches=lambda n: n.name == "d")[0]
        parent2 = code.filter_templates(matches=lambda n: n.name == "b")[0]
        parent3 = code.filter_templates(matches=lambda n: n.name == "a")[0]
        fake = parse("{{f}}").get(0)

        assert [parent3 == parent2, parent1], code.get_ancestors(tmpl)
        assert parent1 is code.get_parent(tmpl)
        assert [] == code.get_ancestors(parent3)
        assert None is code.get_parent(parent3)
        with pytest.raises(ValueError):
            code.get_ancestors(fake)
        with pytest.raises(ValueError):
            code.get_parent(fake)

    def test_insert(self):
        """test Wikicode.insert()"""
        code = parse("Have a {{template}} and a [[page|link]]")
        code.insert(1, "{{{argument}}}")
        assert "Have a {{{argument}}}{{template}} and a [[page|link]]" == code
        assert isinstance(code.get(1), Argument)
        code.insert(2, None)
        assert "Have a {{{argument}}}{{template}} and a [[page|link]]" == code
        code.insert(-3, Text("foo"))
        assert "Have a {{{argument}}}foo{{template}} and a [[page|link]]" == code

        code2 = parse("{{foo}}{{bar}}{{baz}}")
        code2.insert(1, "abc{{def}}ghi[[jk]]")
        assert "{{foo}}abc{{def}}ghi[[jk]]{{bar}}{{baz}}" == code2
        assert ["{{foo}}", "abc", "{{def}}", "ghi", "[[jk]]",
                          "{{bar}}", "{{baz}}"] == code2.nodes

        code3 = parse("{{foo}}bar")
        code3.insert(1000, "[[baz]]")
        code3.insert(-1000, "derp")
        assert "derp{{foo}}bar[[baz]]" == code3

    def _test_search(self, meth, expected):
        """Base test for insert_before(), insert_after(), and replace()."""
        code = parse("{{a}}{{b}}{{c}}{{d}}{{e}}")
        func = partial(meth, code)
        func("{{b}}", "x", recursive=True)
        func("{{d}}", "[[y]]", recursive=False)
        func(code.get(2), "z")
        assert expected[0] == code
        with pytest.raises(ValueError):
            func("{{r}}", "n", recursive=True)
        with pytest.raises(ValueError):
            func("{{r}}", "n", recursive=False)
        fake = parse("{{a}}").get(0)
        with pytest.raises(ValueError):
            func(fake, "n", recursive=True)
        with pytest.raises(ValueError):
            func(fake, "n", recursive=False)

        code2 = parse("{{a}}{{a}}{{a}}{{b}}{{b}}{{b}}")
        func = partial(meth, code2)
        func(code2.get(1), "c", recursive=False)
        func("{{a}}", "d", recursive=False)
        func(code2.get(-1), "e", recursive=True)
        func("{{b}}", "f", recursive=True)
        assert expected[1] == code2

        code3 = parse("{{a|{{b}}|{{c|d={{f}}}}}}")
        func = partial(meth, code3)
        obj = code3.get(0).params[0].value.get(0)
        with pytest.raises(ValueError):
            func(obj, "x", recursive=False)
        func(obj, "x", recursive=True)
        with pytest.raises(ValueError):
            func("{{f}}", "y", recursive=False)
        func("{{f}}", "y", recursive=True)
        assert expected[2] == code3

        code4 = parse("{{a}}{{b}}{{c}}{{d}}{{e}}{{f}}{{g}}{{h}}{{i}}{{j}}")
        func = partial(meth, code4)
        fake = parse("{{b}}{{c}}")
        with pytest.raises(ValueError):
            func(fake, "q", recursive=False)
        with pytest.raises(ValueError):
            func(fake, "q", recursive=True)
        func("{{b}}{{c}}", "w", recursive=False)
        func("{{d}}{{e}}", "x", recursive=True)
        func(Wikicode(code4.nodes[-2:]), "y", recursive=False)
        func(Wikicode(code4.nodes[-2:]), "z", recursive=True)
        assert expected[3] == code4
        with pytest.raises(ValueError):
            func("{{c}}{{d}}", "q", recursive=False)
        with pytest.raises(ValueError):
            func("{{c}}{{d}}", "q", recursive=True)

        code5 = parse("{{a|{{b}}{{c}}|{{f|{{g}}={{h}}{{i}}}}}}")
        func = partial(meth, code5)
        with pytest.raises(ValueError):
            func("{{b}}{{c}}", "x", recursive=False)
        func("{{b}}{{c}}", "x", recursive=True)
        obj = code5.get(0).params[1].value.get(0).params[0].value
        with pytest.raises(ValueError):
            func(obj, "y", recursive=False)
        func(obj, "y", recursive=True)
        assert expected[4] == code5

        code6 = parse("here is {{some text and a {{template}}}}")
        func = partial(meth, code6)
        with pytest.raises(ValueError):
            func("text and", "ab", recursive=False)
        func("text and", "ab", recursive=True)
        with pytest.raises(ValueError):
            func("is {{some", "cd", recursive=False)
        func("is {{some", "cd", recursive=True)
        assert expected[5] == code6

        code7 = parse("{{foo}}{{bar}}{{baz}}{{foo}}{{baz}}")
        func = partial(meth, code7)
        obj = wrap([code7.get(0), code7.get(2)])
        with pytest.raises(ValueError):
            func(obj, "{{lol}}")
        func("{{foo}}{{baz}}", "{{lol}}")
        assert expected[6] == code7

        code8 = parse("== header ==")
        func = partial(meth, code8)
        sec1, sec2 = code8.get_sections(include_headings=False)
        func(sec1, "lead\n")
        func(sec2, "\nbody")
        assert expected[7] == code8

        code9 = parse("{{foo}}")
        meth(code9.get_sections()[0], code9.get_sections()[0], "{{bar}}")
        meth(code9.get_sections()[0], code9, "{{baz}}")
        meth(code9, code9, "{{qux}}")
        meth(code9, code9.get_sections()[0], "{{quz}}")
        assert expected[8] == code9

    def test_insert_before(self):
        """test Wikicode.insert_before()"""
        meth = lambda code, *args, **kw: code.insert_before(*args, **kw)
        expected = [
            "{{a}}xz{{b}}{{c}}[[y]]{{d}}{{e}}",
            "d{{a}}cd{{a}}d{{a}}f{{b}}f{{b}}ef{{b}}",
            "{{a|x{{b}}|{{c|d=y{{f}}}}}}",
            "{{a}}w{{b}}{{c}}x{{d}}{{e}}{{f}}{{g}}{{h}}yz{{i}}{{j}}",
            "{{a|x{{b}}{{c}}|{{f|{{g}}=y{{h}}{{i}}}}}}",
            "here cdis {{some abtext and a {{template}}}}",
            "{{foo}}{{bar}}{{baz}}{{lol}}{{foo}}{{baz}}",
            "lead\n== header ==\nbody",
            "{{quz}}{{qux}}{{baz}}{{bar}}{{foo}}",
        ]
        self._test_search(meth, expected)

    def test_insert_after(self):
        """test Wikicode.insert_after()"""
        meth = lambda code, *args, **kw: code.insert_after(*args, **kw)
        expected = [
            "{{a}}{{b}}xz{{c}}{{d}}[[y]]{{e}}",
            "{{a}}d{{a}}dc{{a}}d{{b}}f{{b}}f{{b}}fe",
            "{{a|{{b}}x|{{c|d={{f}}y}}}}",
            "{{a}}{{b}}{{c}}w{{d}}{{e}}x{{f}}{{g}}{{h}}{{i}}{{j}}yz",
            "{{a|{{b}}{{c}}x|{{f|{{g}}={{h}}{{i}}y}}}}",
            "here is {{somecd text andab a {{template}}}}",
            "{{foo}}{{bar}}{{baz}}{{foo}}{{baz}}{{lol}}",
            "lead\n== header ==\nbody",
            "{{foo}}{{bar}}{{baz}}{{qux}}{{quz}}",
        ]
        self._test_search(meth, expected)

    def test_replace(self):
        """test Wikicode.replace()"""
        meth = lambda code, *args, **kw: code.replace(*args, **kw)
        expected = [
            "{{a}}xz[[y]]{{e}}",
            "dcdffe",
            "{{a|x|{{c|d=y}}}}",
            "{{a}}wx{{f}}{{g}}z",
            "{{a|x|{{f|{{g}}=y}}}}",
            "here cd ab a {{template}}}}",
            "{{foo}}{{bar}}{{baz}}{{lol}}",
            "lead\n== header ==\nbody",
            "{{quz}}",
        ]
        self._test_search(meth, expected)

    def test_append(self):
        """test Wikicode.append()"""
        code = parse("Have a {{template}}")
        code.append("{{{argument}}}")
        assert "Have a {{template}}{{{argument}}}" == code
        assert isinstance(code.get(2), Argument)
        code.append(None)
        assert "Have a {{template}}{{{argument}}}" == code
        code.append(Text(" foo"))
        assert "Have a {{template}}{{{argument}}} foo" == code
        with pytest.raises(ValueError):
            code.append(slice(0, 1))

    def test_remove(self):
        """test Wikicode.remove()"""
        meth = lambda code, obj, value, **kw: code.remove(obj, **kw)
        expected = [
            "{{a}}{{c}}",
            "",
            "{{a||{{c|d=}}}}",
            "{{a}}{{f}}",
            "{{a||{{f|{{g}}=}}}}",
            "here   a {{template}}}}",
            "{{foo}}{{bar}}{{baz}}",
            "== header ==",
            "",
        ]
        self._test_search(meth, expected)

    def test_matches(self):
        """test Wikicode.matches()"""
        code1 = parse("Cleanup")
        code2 = parse("\nstub<!-- TODO: make more specific -->")
        code3 = parse("Hello world!")
        code4 = parse("World,_hello?")
        code5 = parse("")
        assert code1.matches("Cleanup") is True
        assert code1.matches("cleanup") is True
        assert code1.matches("  cleanup\n") is True
        assert code1.matches("CLEANup") is False
        assert code1.matches("Blah") is False
        assert code2.matches("stub") is True
        assert code2.matches("Stub<!-- no, it's fine! -->") is True
        assert code2.matches("StuB") is False
        assert code1.matches(("cleanup", "stub")) is True
        assert code2.matches(("cleanup", "stub")) is True
        assert code2.matches(("StuB", "sTUb", "foobar")) is False
        assert code2.matches(["StuB", "sTUb", "foobar"]) is False
        assert code2.matches(("StuB", "sTUb", "foo", "bar", "Stub")) is True
        assert code2.matches(["StuB", "sTUb", "foo", "bar", "Stub"]) is True
        assert code3.matches("hello world!") is True
        assert code3.matches("hello_world!") is True
        assert code3.matches("hello__world!") is False
        assert code4.matches("World,_hello?") is True
        assert code4.matches("World, hello?") is True
        assert code4.matches("World,  hello?") is False
        assert code5.matches("") is True
        assert code5.matches("<!-- nothing -->") is True
        assert code5.matches(("a", "b", "")) is True

    def test_filter_family(self):
        """test the Wikicode.i?filter() family of functions"""
        def genlist(gen):
            assert isinstance(gen, GeneratorType)
            return list(gen)
        ifilter = lambda code: (lambda *a, **k: genlist(code.ifilter(*a, **k)))

        code = parse("a{{b}}c[[d]]{{{e}}}{{f}}[[g]]")
        for func in (code.filter, ifilter(code)):
            assert ["a", "{{b}}", "b", "c", "[[d]]", "d", "{{{e}}}",
                    "e", "{{f}}", "f", "[[g]]", "g"] == func()
            assert ["{{{e}}}"] == func(forcetype=Argument)
            assert code.get(4) is func(forcetype=Argument)[0]
            assert list("abcdefg") == func(forcetype=Text)
            assert [] == func(forcetype=Heading)
            with pytest.raises(TypeError):
                func(forcetype=True)

        funcs = [
            lambda name, **kw: getattr(code, "filter_" + name)(**kw),
            lambda name, **kw: genlist(getattr(code, "ifilter_" + name)(**kw))
        ]
        for get_filter in funcs:
            assert ["{{{e}}}"] == get_filter("arguments")
            assert code.get(4) is get_filter("arguments")[0]
            assert [] == get_filter("comments")
            assert [] == get_filter("external_links")
            assert [] == get_filter("headings")
            assert [] == get_filter("html_entities")
            assert [] == get_filter("tags")
            assert ["{{b}}" == "{{f}}"], get_filter("templates")
            assert list("abcdefg") == get_filter("text")
            assert ["[[d]]" == "[[g]]"], get_filter("wikilinks")

        code2 = parse("{{a|{{b}}|{{c|d={{f}}{{h}}}}}}")
        for func in (code2.filter, ifilter(code2)):
            assert ["{{a|{{b}}|{{c|d={{f}}{{h}}}}}}"] \
                   == func(recursive=False, forcetype=Template)
            assert ["{{a|{{b}}|{{c|d={{f}}{{h}}}}}}", "{{b}}",
                    "{{c|d={{f}}{{h}}}}", "{{f}}", "{{h}}"] \
                   == func(recursive=True, forcetype=Template)

        code3 = parse("{{foobar}}{{FOO}}{{baz}}{{bz}}{{barfoo}}")
        for func in (code3.filter, ifilter(code3)):
            assert ["{{foobar}}", "{{barfoo}}"] \
                == func(False, matches=lambda node: "foo" in node)
            assert ["{{foobar}}", "{{FOO}}", "{{barfoo}}"] \
                == func(False, matches=r"foo")
            assert ["{{foobar}}", "{{FOO}}"] \
                == func(matches=r"^{{foo.*?}}")
            assert ["{{foobar}}"] \
                == func(matches=r"^{{foo.*?}}", flags=re.UNICODE)
            assert ["{{baz}}" == "{{bz}}"], func(matches=r"^{{b.*?z")
            assert ["{{baz}}"] == func(matches=r"^{{b.+?z}}")

        exp_rec = ["{{a|{{b}}|{{c|d={{f}}{{h}}}}}}", "{{b}}",
                   "{{c|d={{f}}{{h}}}}", "{{f}}", "{{h}}"]
        exp_unrec = ["{{a|{{b}}|{{c|d={{f}}{{h}}}}}}"]
        assert exp_rec == code2.filter_templates()
        assert exp_unrec == code2.filter_templates(recursive=False)
        assert exp_rec == code2.filter_templates(recursive=True)
        assert exp_rec == code2.filter_templates(True)
        assert exp_unrec == code2.filter_templates(False)

        assert ["{{foobar}}"] == code3.filter_templates(
            matches=lambda node: node.name.matches("Foobar"))
        assert ["{{baz}}", "{{bz}}"] \
            == code3.filter_templates(matches=r"^{{b.*?z")
        assert [] == code3.filter_tags(matches=r"^{{b.*?z")
        assert [] == code3.filter_tags(matches=r"^{{b.*?z", flags=0)
        with pytest.raises(TypeError):
            code.filter_templates(a=42)
        with pytest.raises(TypeError):
            code.filter_templates(forcetype=Template)
        with pytest.raises(TypeError):
            code.filter_templates(1, 0, 0, Template)

        code4 = parse("{{foo}}<b>{{foo|{{bar}}}}</b>")
        actual1 = code4.filter_templates(recursive=code4.RECURSE_OTHERS)
        actual2 = code4.filter_templates(code4.RECURSE_OTHERS)
        assert ["{{foo}}" == "{{foo|{{bar}}}}"], actual1
        assert ["{{foo}}" == "{{foo|{{bar}}}}"], actual2

    def test_get_sections(self):
        """test Wikicode.get_sections()"""
        page1 = parse("")
        page2 = parse("==Heading==")
        page3 = parse("===Heading===\nFoo bar baz\n====Gnidaeh====\n")

        p4_lead = "This is a lead.\n"
        p4_IA = "=== Section I.A ===\nSection I.A [[body]].\n"
        p4_IB1 = "==== Section I.B.1 ====\nSection I.B.1 body.\n\n&bull;Some content.\n\n"
        p4_IB = "=== Section I.B ===\n" + p4_IB1
        p4_I = "== Section I ==\nSection I body. {{and a|template}}\n" + p4_IA + p4_IB
        p4_II = "== Section II ==\nSection II body.\n\n"
        p4_IIIA1a = "===== Section III.A.1.a =====\nMore text.\n"
        p4_IIIA2ai1 = "======= Section III.A.2.a.i.1 =======\nAn invalid section!"
        p4_IIIA2 = "==== Section III.A.2 ====\nEven more text.\n" + p4_IIIA2ai1
        p4_IIIA = "=== Section III.A ===\nText.\n" + p4_IIIA1a + p4_IIIA2
        p4_III = "== Section III ==\n" + p4_IIIA
        page4 = parse(p4_lead + p4_I + p4_II + p4_III)

        assert [""] == page1.get_sections()
        assert ["" == "==Heading=="], page2.get_sections()
        assert ["", "===Heading===\nFoo bar baz\n====Gnidaeh====\n", "====Gnidaeh====\n"] \
            == page3.get_sections()
        assert [p4_lead, p4_I, p4_IA, p4_IB, p4_IB1, p4_II,
                p4_III, p4_IIIA, p4_IIIA1a, p4_IIIA2, p4_IIIA2ai1] \
            == page4.get_sections()

        assert ["====Gnidaeh====\n"] == page3.get_sections(levels=[4])
        assert ["===Heading===\nFoo bar baz\n====Gnidaeh====\n"] \
            == page3.get_sections(levels=(2, 3))
        assert ["===Heading===\nFoo bar baz\n"] \
            == page3.get_sections(levels=(2, 3), flat=True)
        assert [] == page3.get_sections(levels=[0])
        assert ["", "====Gnidaeh====\n"] ==  page3.get_sections(levels=[4], include_lead=True)
        assert ["===Heading===\nFoo bar baz\n====Gnidaeh====\n",
                "====Gnidaeh====\n"] == page3.get_sections(include_lead=False)
        assert ["===Heading===\nFoo bar baz\n", "====Gnidaeh====\n"] \
            == page3.get_sections(flat=True, include_lead=False)

        assert [p4_IB1 == p4_IIIA2], page4.get_sections(levels=[4])
        assert [p4_IA == p4_IB, p4_IIIA], page4.get_sections(levels=[3])
        assert [p4_IA, "=== Section I.B ===\n",
                "=== Section III.A ===\nText.\n"] \
            == page4.get_sections(levels=[3], flat=True)
        assert ["" == ""], page2.get_sections(include_headings=False)
        assert ["\nSection I.B.1 body.\n\n&bull;Some content.\n\n",
                "\nEven more text.\n" + p4_IIIA2ai1] \
            == page4.get_sections(levels=[4], include_headings=False)

        assert [] == page4.get_sections(matches=r"body")
        assert [p4_I, p4_IA, p4_IB, p4_IB1] \
            == page4.get_sections(matches=r"Section\sI[.\s].*?")
        assert [p4_IA, p4_IIIA, p4_IIIA1a, p4_IIIA2, p4_IIIA2ai1] \
            == page4.get_sections(matches=r".*?a.*?")
        assert [p4_IIIA1a, p4_IIIA2ai1] \
            == page4.get_sections(matches=r".*?a.*?", flags=re.U)
        assert ["\nMore text.\n", "\nAn invalid section!"] \
            == page4.get_sections(matches=r".*?a.*?", flags=re.U,
                                  include_headings=False)

        sections = page2.get_sections(include_headings=False)
        sections[0].append("Lead!\n")
        sections[1].append("\nFirst section!")
        assert "Lead!\n==Heading==\nFirst section!" == page2

        page5 = parse("X\n== Foo ==\nBar\n== Baz ==\nBuzz")
        section = page5.get_sections(matches="Foo")[0]
        section.replace("\nBar\n", "\nBarf ")
        section.append("{{Haha}}\n")
        assert "== Foo ==\nBarf {{Haha}}\n" == section
        assert "X\n== Foo ==\nBarf {{Haha}}\n== Baz ==\nBuzz" == page5

    def test_strip_code(self):
        """test Wikicode.strip_code()"""
        # Since individual nodes have test cases for their __strip__ methods,
        # we're only going to do an integration test:
        code = parse("Foo [[bar]]\n\n{{baz|hello}}\n\n[[a|b]] &Sigma;")
        assert "Foo bar\n\nb Σ" \
               == code.strip_code(normalize=True, collapse=True)
        assert "Foo bar\n\n\n\nb Σ" \
               == code.strip_code(normalize=True, collapse=False)
        assert "Foo bar\n\nb &Sigma;" \
               == code.strip_code(normalize=False, collapse=True)
        assert "Foo bar\n\n\n\nb &Sigma;" \
               == code.strip_code(normalize=False, collapse=False)
        assert "Foo bar\n\nhello\n\nb Σ" \
               == code.strip_code(normalize=True, collapse=True,
                                  keep_template_params=True)

    def test_get_tree(self):
        """test Wikicode.get_tree()"""
        # Since individual nodes have test cases for their __showtree___
        # methods, and the docstring covers all possibilities for the output of
        # __showtree__, we'll test it only:
        code = parse("Lorem ipsum {{foo|bar|{{baz}}|spam=eggs}}")
        expected = "Lorem ipsum \n{{\n\t  foo\n\t| 1\n\t= bar\n\t| 2\n\t= " + \
                   "{{\n\t\t\tbaz\n\t  }}\n\t| spam\n\t= eggs\n}}"
        assert expected.expandtabs(4) == code.get_tree()