Use Node.from_parent() constructor to support pytest 6

Add a wrapper not to break pytest 4 (needed for Python 2 support).

    ============================= test session starts ==============================
    platform linux -- Python 3.9.0b5, pytest-6.0.1, py-1.9.0, pluggy-0.13.1
    rootdir: /builddir/build/BUILD/html5lib-1.1, configfile: pytest.ini
    plugins: expect-1.1.0
    collected 0 items / 1 error

    ==================================== ERRORS ====================================
    ________________________ ERROR collecting test session _________________________
    /usr/lib/python3.9/site-packages/pluggy/hooks.py:286: in __call__
        return self._hookexec(self, self.get_hookimpls(), kwargs)
    /usr/lib/python3.9/site-packages/pluggy/manager.py:93: in _hookexec
        return self._inner_hookexec(hook, methods, kwargs)
    /usr/lib/python3.9/site-packages/pluggy/manager.py:84: in <lambda>
        self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
    html5lib/tests/conftest.py:105: in pytest_collect_file
        return TokenizerFile(path, parent)
    /usr/lib/python3.9/site-packages/_pytest/nodes.py:95: in __call__
        warnings.warn(NODE_USE_FROM_PARENT.format(name=self.__name__), stacklevel=2)
    E   pytest.PytestDeprecationWarning: Direct construction of TokenizerFile has been deprecated, please use TokenizerFile.from_parent.
    E   See https://docs.pytest.org/en/stable/deprecations.html#node-construction-changed-to-node-from-parent for more details.

Fixes #505

Author: hroncok

html5lib/tests/conftest.py

@@ -99,10 +99,19 @@ def pytest_collect_file(path, parent):
 
     if _tree_construction in dir_and_parents:
         if path.ext == ".dat":
-            return TreeConstructionFile(path, parent)
+            return TreeConstructionFile.from_parent(parent, fspath=path)
     elif _tokenizer in dir_and_parents:
         if path.ext == ".test":
-            return TokenizerFile(path, parent)
+            return TokenizerFile.from_parent(parent, fspath=path)
     elif _sanitizer_testdata in dir_and_parents:
         if path.ext == ".dat":
-            return SanitizerFile(path, parent)
+            return SanitizerFile.from_parent(parent, fspath=path)
+
+
+# Tiny wrapper to allow .from_parent constructors on older pytest for PY27
+if not hasattr(pytest.Item.__base__, "from_parent"):
+    @classmethod
+    def from_parent(cls, parent, **kwargs):
+        return cls(parent=parent, **kwargs)
+
+    pytest.Item.__base__.from_parent = from_parent

html5lib/tests/sanitizer.py

@@ -13,7 +13,7 @@ def collect(self):
         with codecs.open(str(self.fspath), "r", encoding="utf-8") as fp:
             tests = json.load(fp)
         for i, test in enumerate(tests):
-            yield SanitizerTest(str(i), self, test=test)
+            yield SanitizerTest.from_parent(self, name=str(i), test=test)
 
 
 class SanitizerTest(pytest.Item):

html5lib/tests/tokenizer.py

@@ -192,7 +192,7 @@ def collect(self):
             tests = json.load(fp)
         if 'tests' in tests:
             for i, test in enumerate(tests['tests']):
-                yield TokenizerTestCollector(str(i), self, testdata=test)
+                yield TokenizerTestCollector.from_parent(self, name=str(i), testdata=test)
 
 
 class TokenizerTestCollector(pytest.Collector):
@@ -207,10 +207,10 @@ def __init__(self, name, parent=None, config=None, session=None, testdata=None):
     def collect(self):
         for initialState in self.testdata["initialStates"]:
             initialState = capitalize(initialState)
-            item = TokenizerTest(initialState,
-                                 self,
-                                 self.testdata,
-                                 initialState)
+            item = TokenizerTest.from_parent(self,
+                                             name=initialState,
+                                             test=self.testdata,
+                                             initialState=initialState)
             if self.testdata["input"] is None:
                 item.add_marker(pytest.mark.skipif(True, reason="Relies on lone surrogates"))
             yield item

html5lib/tests/tree_construction.py

@@ -26,7 +26,7 @@ class TreeConstructionFile(pytest.File):
     def collect(self):
         tests = TestData(str(self.fspath), "data")
         for i, test in enumerate(tests):
-            yield TreeConstructionTest(str(i), self, testdata=test)
+            yield TreeConstructionTest.from_parent(self, name=str(i), testdata=test)
 
 
 class TreeConstructionTest(pytest.Collector):
@@ -48,11 +48,11 @@ def _getParserTests(self, treeName, treeAPIs):
                 nodeid = "%s::parser::namespaced" % treeName
             else:
                 nodeid = "%s::parser::void-namespace" % treeName
-            item = ParserTest(nodeid,
-                              self,
-                              self.testdata,
-                              treeAPIs["builder"] if treeAPIs is not None else None,
-                              namespaceHTMLElements)
+            item = ParserTest.from_parent(self,
+                                          name=nodeid,
+                                          test=self.testdata,
+                                          treeClass=treeAPIs["builder"] if treeAPIs is not None else None,
+                                          namespaceHTMLElements=namespaceHTMLElements)
             item.add_marker(getattr(pytest.mark, treeName))
             item.add_marker(pytest.mark.parser)
             if namespaceHTMLElements:
@@ -61,10 +61,10 @@ def _getParserTests(self, treeName, treeAPIs):
 
     def _getTreeWalkerTests(self, treeName, treeAPIs):
         nodeid = "%s::treewalker" % treeName
-        item = TreeWalkerTest(nodeid,
-                              self,
-                              self.testdata,
-                              treeAPIs)
+        item = TreeWalkerTest.from_parent(self,
+                                          name=nodeid,
+                                          test=self.testdata,
+                                          treeAPIs=treeAPIs)
         item.add_marker(getattr(pytest.mark, treeName))
         item.add_marker(pytest.mark.treewalker)
         yield item

requirements-test.txt

@@ -3,7 +3,7 @@
 tox>=3.15.1,<4
 flake8>=3.8.1,<3.9
 pytest>=4.6.10,<5 ; python_version < '3'
-pytest>=5.4.2,<6 ; python_version >= '3'
+pytest>=5.4.2,<7 ; python_version >= '3'
 coverage>=5.1,<6
 pytest-expect>=1.1.0,<2
 mock>=3.0.5,<4 ; python_version < '3.6'