diff --git a/src/_pytest/assertion/rewrite.py b/src/_pytest/assertion/rewrite.py
index a48a931ac..9c622213c 100644
--- a/src/_pytest/assertion/rewrite.py
+++ b/src/_pytest/assertion/rewrite.py
@@ -209,8 +209,11 @@ class AssertionRewritingHook(object):
         self._must_rewrite.update(names)
 
     def _warn_already_imported(self, name):
-        self.config.warn(
-            "P1", "Module already imported so cannot be rewritten: %s" % name
+        import warnings
+        from _pytest.warning_types import PytestWarning
+
+        warnings.warn(
+            "Module already imported so cannot be rewritten: %s" % name, PytestWarning
         )
 
     def load_module(self, name):
@@ -746,13 +749,17 @@ class AssertionRewriter(ast.NodeVisitor):
         the expression is false.
 
         """
-        if isinstance(assert_.test, ast.Tuple) and self.config is not None:
-            fslocation = (self.module_path, assert_.lineno)
-            self.config.warn(
-                "R1",
+        if isinstance(assert_.test, ast.Tuple):
+            from _pytest.warning_types import PytestWarning
+            import warnings
+
+            warnings.warn_explicit(
                 "assertion is always true, perhaps " "remove parentheses?",
-                fslocation=fslocation,
+                PytestWarning,
+                filename=str(self.module_path),
+                lineno=assert_.lineno,
             )
+
         self.statements = []
         self.variables = []
         self.variable_counter = itertools.count()
diff --git a/src/_pytest/cacheprovider.py b/src/_pytest/cacheprovider.py
index 7cad246c8..dbe953406 100755
--- a/src/_pytest/cacheprovider.py
+++ b/src/_pytest/cacheprovider.py
@@ -33,7 +33,6 @@ See [the docs](https://docs.pytest.org/en/latest/cache.html) for more informatio
 @attr.s
 class Cache(object):
     _cachedir = attr.ib(repr=False)
-    _warn = attr.ib(repr=False)
 
     @classmethod
     def for_config(cls, config):
@@ -41,14 +40,19 @@ class Cache(object):
         if config.getoption("cacheclear") and cachedir.exists():
             shutil.rmtree(str(cachedir))
             cachedir.mkdir()
-        return cls(cachedir, config.warn)
+        return cls(cachedir)
 
     @staticmethod
     def cache_dir_from_config(config):
         return paths.resolve_from_str(config.getini("cache_dir"), config.rootdir)
 
     def warn(self, fmt, **args):
-        self._warn(code="I9", message=fmt.format(**args) if args else fmt)
+        import warnings
+        from _pytest.warning_types import PytestWarning
+
+        warnings.warn(
+            message=fmt.format(**args) if args else fmt, category=PytestWarning
+        )
 
     def makedir(self, name):
         """ return a directory path object with the given name.  If the
diff --git a/src/_pytest/config/__init__.py b/src/_pytest/config/__init__.py
index be412afd3..f0aecbe55 100644
--- a/src/_pytest/config/__init__.py
+++ b/src/_pytest/config/__init__.py
@@ -176,7 +176,9 @@ def _prepareconfig(args=None, plugins=None):
                 else:
                     pluginmanager.register(plugin)
         if warning:
-            config.warn("C1", warning)
+            from _pytest.warning_types import PytestUsageWarning
+
+            warnings.warn(warning, PytestUsageWarning)
         return pluginmanager.hook.pytest_cmdline_parse(
             pluginmanager=pluginmanager, args=args
         )
@@ -609,7 +611,26 @@ class Config(object):
             fin()
 
     def warn(self, code, message, fslocation=None, nodeid=None):
-        """ generate a warning for this test session. """
+        """
+        .. deprecated:: 3.8
+
+            Use :py:func:`warnings.warn` or :py:func:`warnings.warn_explicit` directly instead.
+
+        Generate a warning for this test session.
+        """
+        from _pytest.warning_types import RemovedInPytest4Warning
+
+        if isinstance(fslocation, (tuple, list)) and len(fslocation) > 2:
+            filename, lineno = fslocation[:2]
+        else:
+            filename = "unknown file"
+            lineno = 0
+        msg = "config.warn has been deprecated, use warnings.warn instead"
+        if nodeid:
+            msg = "{}: {}".format(nodeid, msg)
+        warnings.warn_explicit(
+            msg, RemovedInPytest4Warning, filename=filename, lineno=lineno
+        )
         self.hook.pytest_logwarning.call_historic(
             kwargs=dict(
                 code=code, message=message, fslocation=fslocation, nodeid=nodeid
@@ -674,7 +695,6 @@ class Config(object):
         r = determine_setup(
             ns.inifilename,
             ns.file_or_dir + unknown_args,
-            warnfunc=self.warn,
             rootdir_cmd_arg=ns.rootdir or None,
         )
         self.rootdir, self.inifile, self.inicfg = r
diff --git a/src/_pytest/config/findpaths.py b/src/_pytest/config/findpaths.py
index 234aa69c7..e10c455b1 100644
--- a/src/_pytest/config/findpaths.py
+++ b/src/_pytest/config/findpaths.py
@@ -10,7 +10,7 @@ def exists(path, ignore=EnvironmentError):
         return False
 
 
-def getcfg(args, warnfunc=None):
+def getcfg(args):
     """
     Search the list of arguments for a valid ini-file for pytest,
     and return a tuple of (rootdir, inifile, cfg-dict).
@@ -34,9 +34,13 @@ def getcfg(args, warnfunc=None):
                 if exists(p):
                     iniconfig = py.iniconfig.IniConfig(p)
                     if "pytest" in iniconfig.sections:
-                        if inibasename == "setup.cfg" and warnfunc:
-                            warnfunc(
-                                "C1", CFG_PYTEST_SECTION.format(filename=inibasename)
+                        if inibasename == "setup.cfg":
+                            import warnings
+                            from _pytest.warning_types import RemovedInPytest4Warning
+
+                            warnings.warn(
+                                CFG_PYTEST_SECTION.format(filename=inibasename),
+                                RemovedInPytest4Warning,
                             )
                         return base, p, iniconfig["pytest"]
                     if (
@@ -95,7 +99,7 @@ def get_dirs_from_args(args):
     return [get_dir_from_path(path) for path in possible_paths if path.exists()]
 
 
-def determine_setup(inifile, args, warnfunc=None, rootdir_cmd_arg=None):
+def determine_setup(inifile, args, rootdir_cmd_arg=None):
     dirs = get_dirs_from_args(args)
     if inifile:
         iniconfig = py.iniconfig.IniConfig(inifile)
@@ -105,23 +109,28 @@ def determine_setup(inifile, args, warnfunc=None, rootdir_cmd_arg=None):
         for section in sections:
             try:
                 inicfg = iniconfig[section]
-                if is_cfg_file and section == "pytest" and warnfunc:
+                if is_cfg_file and section == "pytest":
+                    from _pytest.warning_types import RemovedInPytest4Warning
                     from _pytest.deprecated import CFG_PYTEST_SECTION
+                    import warnings
 
-                    warnfunc("C1", CFG_PYTEST_SECTION.format(filename=str(inifile)))
+                    warnings.warn(
+                        CFG_PYTEST_SECTION.format(filename=str(inifile)),
+                        RemovedInPytest4Warning,
+                    )
                 break
             except KeyError:
                 inicfg = None
         rootdir = get_common_ancestor(dirs)
     else:
         ancestor = get_common_ancestor(dirs)
-        rootdir, inifile, inicfg = getcfg([ancestor], warnfunc=warnfunc)
+        rootdir, inifile, inicfg = getcfg([ancestor])
         if rootdir is None:
             for rootdir in ancestor.parts(reverse=True):
                 if rootdir.join("setup.py").exists():
                     break
             else:
-                rootdir, inifile, inicfg = getcfg(dirs, warnfunc=warnfunc)
+                rootdir, inifile, inicfg = getcfg(dirs)
                 if rootdir is None:
                     rootdir = get_common_ancestor([py.path.local(), ancestor])
                     is_fs_root = os.path.splitdrive(str(rootdir))[1] == "/"
diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index bfbf7bb54..476acab02 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -1281,8 +1281,12 @@ class FixtureManager(object):
                 marker = defaultfuncargprefixmarker
                 from _pytest import deprecated
 
-                self.config.warn(
-                    "C1", deprecated.FUNCARG_PREFIX.format(name=name), nodeid=nodeid
+                filename, lineno = getfslineno(obj)
+                warnings.warn_explicit(
+                    deprecated.FUNCARG_PREFIX.format(name=name),
+                    RemovedInPytest4Warning,
+                    filename=str(filename),
+                    lineno=lineno + 1,
                 )
                 name = name[len(self._argprefix) :]
             elif not isinstance(marker, FixtureFunctionMarker):
diff --git a/src/_pytest/junitxml.py b/src/_pytest/junitxml.py
index 86aad69bb..2f34970a1 100644
--- a/src/_pytest/junitxml.py
+++ b/src/_pytest/junitxml.py
@@ -274,8 +274,11 @@ def record_xml_attribute(request):
     The fixture is callable with ``(name, value)``, with value being
     automatically xml-encoded
     """
-    request.node.warn(
-        code="C3", message="record_xml_attribute is an experimental feature"
+    from _pytest.warning_types import PytestWarning
+
+    request.node.std_warn(
+        message="record_xml_attribute is an experimental feature",
+        category=PytestWarning,
     )
     xml = getattr(request.config, "_xml", None)
     if xml is not None:
diff --git a/src/_pytest/nodes.py b/src/_pytest/nodes.py
index e0291a088..3bb10ee89 100644
--- a/src/_pytest/nodes.py
+++ b/src/_pytest/nodes.py
@@ -137,8 +137,20 @@ class Node(object):
         return "<%s %r>" % (self.__class__.__name__, getattr(self, "name", None))
 
     def warn(self, code, message):
-        """ generate a warning with the given code and message for this
-        item. """
+        """
+        .. deprecated:: 3.8
+
+            Use :meth:`Node.std_warn <_pytest.nodes.Node.std_warn>` instead.
+
+        Generate a warning with the given code and message for this item.
+        """
+        from _pytest.warning_types import RemovedInPytest4Warning
+
+        self.std_warn(
+            "Node.warn has been deprecated, use Node.std_warn instead",
+            RemovedInPytest4Warning,
+        )
+
         assert isinstance(code, str)
         fslocation = get_fslocation_from_item(self)
         self.ihook.pytest_logwarning.call_historic(
@@ -148,12 +160,24 @@ class Node(object):
         )
 
     def std_warn(self, message, category=None):
+        """Issue a warning for this item.
+
+        Warnings will be displayed after the test session, unless explicitly suppressed
+
+        :param Union[str,Warning] message: text message of the warning or ``Warning`` instance.
+        :param Type[Warning] category: warning category.
+        """
         from _pytest.warning_types import PytestWarning
 
         if category is None:
             assert isinstance(message, PytestWarning)
         path, lineno = get_fslocation_from_item(self)
-        warnings.warn_explicit(message, category, filename=str(path), lineno=lineno)
+        warnings.warn_explicit(
+            message,
+            category,
+            filename=str(path),
+            lineno=lineno + 1 if lineno is not None else None,
+        )
 
     # methods for ordering nodes
     @property
@@ -323,6 +347,8 @@ def get_fslocation_from_item(item):
 
     * "fslocation": a pair (path, lineno)
     * "fspath": just a path
+
+    :rtype: a tuple of (str|LocalPath, int) with filename and line number.
     """
     result = getattr(item, "location", None)
     if result is not None:
@@ -330,7 +356,7 @@ def get_fslocation_from_item(item):
     obj = getattr(item, "obj", None)
     if obj is not None:
         return getfslineno(obj)
-    return getattr(item, "fspath", None), None
+    return getattr(item, "fspath", "unknown location"), -1
 
 
 class Collector(Node):
diff --git a/src/_pytest/python.py b/src/_pytest/python.py
index 4a7faff07..5a531766b 100644
--- a/src/_pytest/python.py
+++ b/src/_pytest/python.py
@@ -44,7 +44,11 @@ from _pytest.mark.structures import (
     get_unpacked_marks,
     normalize_mark_list,
 )
-from _pytest.warning_types import PytestUsageWarning, RemovedInPytest4Warning
+from _pytest.warning_types import (
+    PytestUsageWarning,
+    RemovedInPytest4Warning,
+    PytestWarning,
+)
 
 # relative paths that we use to filter traceback entries from appearing to the user;
 # see filter_traceback
@@ -239,9 +243,12 @@ def pytest_pycollect_makeitem(collector, name, obj):
         # or a funtools.wrapped.
         # We musn't if it's been wrapped with mock.patch (python 2 only)
         if not (isfunction(obj) or isfunction(get_real_func(obj))):
-            collector.warn(
-                code="C2",
+            filename, lineno = getfslineno(obj)
+            warnings.warn_explicit(
                 message="cannot collect %r because it is not a function." % name,
+                category=PytestWarning,
+                filename=str(filename),
+                lineno=lineno + 1,
             )
         elif getattr(obj, "__test__", True):
             if is_generator(obj):
@@ -800,7 +807,7 @@ class Generator(FunctionMixin, PyCollector):
                 )
             seen[name] = True
             values.append(self.Function(name, self, args=args, callobj=call))
-        self.warn("C1", deprecated.YIELD_TESTS)
+        self.std_warn(deprecated.YIELD_TESTS, RemovedInPytest4Warning)
         return values
 
     def getcallargs(self, obj):
@@ -1107,9 +1114,10 @@ class Metafunc(fixtures.FuncargnamesCompatAttr):
             invocation through the ``request.param`` attribute.
         """
         if self.config:
-            self.config.warn(
-                "C1", message=deprecated.METAFUNC_ADD_CALL, fslocation=None
+            self.definition.std_warn(
+                deprecated.METAFUNC_ADD_CALL, RemovedInPytest4Warning
             )
+
         assert funcargs is None or isinstance(funcargs, dict)
         if funcargs is not None:
             for name in funcargs:
diff --git a/src/_pytest/resultlog.py b/src/_pytest/resultlog.py
index 0ad31b8bc..308abd251 100644
--- a/src/_pytest/resultlog.py
+++ b/src/_pytest/resultlog.py
@@ -31,8 +31,10 @@ def pytest_configure(config):
         config.pluginmanager.register(config._resultlog)
 
         from _pytest.deprecated import RESULT_LOG
+        import warnings
+        from _pytest.warning_types import RemovedInPytest4Warning
 
-        config.warn("C1", RESULT_LOG)
+        warnings.warn(RESULT_LOG, RemovedInPytest4Warning)
 
 
 def pytest_unconfigure(config):
diff --git a/testing/acceptance_test.py b/testing/acceptance_test.py
index 428ac464c..6b374083f 100644
--- a/testing/acceptance_test.py
+++ b/testing/acceptance_test.py
@@ -526,7 +526,7 @@ class TestInvocationVariants(object):
         assert pytest.main == py.test.cmdline.main
 
     def test_invoke_with_string(self, capsys):
-        retcode = pytest.main("-h")
+        retcode = pytest.main(["-h"])
         assert not retcode
         out, err = capsys.readouterr()
         assert "--help" in out
diff --git a/testing/deprecated_test.py b/testing/deprecated_test.py
index 15e66d718..70c6df63f 100644
--- a/testing/deprecated_test.py
+++ b/testing/deprecated_test.py
@@ -5,6 +5,7 @@ import os
 import pytest
 
 
+@pytest.mark.filterwarnings("default")
 def test_yield_tests_deprecation(testdir):
     testdir.makepyfile(
         """
@@ -18,16 +19,18 @@ def test_yield_tests_deprecation(testdir):
                 yield func1, 1, 1
     """
     )
-    result = testdir.runpytest("-ra")
+    result = testdir.runpytest()
     result.stdout.fnmatch_lines(
         [
-            "*yield tests are deprecated, and scheduled to be removed in pytest 4.0*",
+            "*test_yield_tests_deprecation.py:3:*yield tests are deprecated*",
+            "*test_yield_tests_deprecation.py:6:*yield tests are deprecated*",
             "*2 passed*",
         ]
     )
     assert result.stdout.str().count("yield tests are deprecated") == 2
 
 
+@pytest.mark.filterwarnings("default")
 def test_funcarg_prefix_deprecation(testdir):
     testdir.makepyfile(
         """
@@ -42,16 +45,18 @@ def test_funcarg_prefix_deprecation(testdir):
     result.stdout.fnmatch_lines(
         [
             (
-                "*pytest_funcarg__value: "
-                'declaring fixtures using "pytest_funcarg__" prefix is deprecated '
-                "and scheduled to be removed in pytest 4.0.  "
-                "Please remove the prefix and use the @pytest.fixture decorator instead."
+                "*test_funcarg_prefix_deprecation.py:1: *pytest_funcarg__value: "
+                'declaring fixtures using "pytest_funcarg__" prefix is deprecated*'
             ),
             "*1 passed*",
         ]
     )
 
 
+@pytest.mark.filterwarnings("default")
+@pytest.mark.xfail(
+    reason="#2891 need to handle warnings during pre-config", strict=True
+)
 def test_pytest_setup_cfg_deprecated(testdir):
     testdir.makefile(
         ".cfg",
@@ -66,6 +71,10 @@ def test_pytest_setup_cfg_deprecated(testdir):
     )
 
 
+@pytest.mark.filterwarnings("default")
+@pytest.mark.xfail(
+    reason="#2891 need to handle warnings during pre-config", strict=True
+)
 def test_pytest_custom_cfg_deprecated(testdir):
     testdir.makefile(
         ".cfg",
@@ -80,6 +89,9 @@ def test_pytest_custom_cfg_deprecated(testdir):
     )
 
 
+@pytest.mark.xfail(
+    reason="#2891 need to handle warnings during pre-config", strict=True
+)
 def test_str_args_deprecated(tmpdir, testdir):
     """Deprecate passing strings to pytest.main(). Scheduled for removal in pytest-4.0."""
     from _pytest.main import EXIT_NOTESTSCOLLECTED
@@ -103,6 +115,10 @@ def test_getfuncargvalue_is_deprecated(request):
     pytest.deprecated_call(request.getfuncargvalue, "tmpdir")
 
 
+@pytest.mark.filterwarnings("default")
+@pytest.mark.xfail(
+    reason="#2891 need to handle warnings during pre-config", strict=True
+)
 def test_resultlog_is_deprecated(testdir):
     result = testdir.runpytest("--help")
     result.stdout.fnmatch_lines(["*DEPRECATED path for machine-readable result log*"])
diff --git a/testing/python/collect.py b/testing/python/collect.py
index 8f4283e40..b5475f03f 100644
--- a/testing/python/collect.py
+++ b/testing/python/collect.py
@@ -462,6 +462,7 @@ class TestFunction(object):
         assert isinstance(modcol, pytest.Module)
         assert hasattr(modcol.obj, "test_func")
 
+    @pytest.mark.filterwarnings("default")
     def test_function_as_object_instance_ignored(self, testdir):
         testdir.makepyfile(
             """
@@ -472,8 +473,14 @@ class TestFunction(object):
             test_a = A()
         """
         )
-        reprec = testdir.inline_run()
-        reprec.assertoutcome()
+        result = testdir.runpytest()
+        result.stdout.fnmatch_lines(
+            [
+                "collected 0 items",
+                "*test_function_as_object_instance_ignored.py:2: "
+                "*cannot collect 'test_a' because it is not a function.",
+            ]
+        )
 
     def test_function_equality(self, testdir, tmpdir):
         from _pytest.fixtures import FixtureManager
@@ -1468,6 +1475,7 @@ def test_collect_functools_partial(testdir):
     result.assertoutcome(passed=6, failed=2)
 
 
+@pytest.mark.filterwarnings("default")
 def test_dont_collect_non_function_callable(testdir):
     """Test for issue https://github.com/pytest-dev/pytest/issues/331
 
@@ -1490,7 +1498,7 @@ def test_dont_collect_non_function_callable(testdir):
     result.stdout.fnmatch_lines(
         [
             "*collected 1 item*",
-            "*cannot collect 'test_a' because it is not a function*",
+            "*test_dont_collect_non_function_callable.py:2: *cannot collect 'test_a' because it is not a function*",
             "*1 passed, 1 warnings in *",
         ]
     )
diff --git a/testing/python/metafunc.py b/testing/python/metafunc.py
index 608cd52d4..5d9282435 100644
--- a/testing/python/metafunc.py
+++ b/testing/python/metafunc.py
@@ -407,8 +407,8 @@ class TestMetafunc(object):
                 "<Module 'test_parametrize_ids_exception.py'>",
                 "  <Function 'test_foo[a]'>",
                 "  <Function 'test_foo[b]'>",
-                "*test_parametrize_ids_exception.py:5: *parameter arg at position 0*",
-                "*test_parametrize_ids_exception.py:5: *parameter arg at position 1*",
+                "*test_parametrize_ids_exception.py:6: *parameter arg at position 0*",
+                "*test_parametrize_ids_exception.py:6: *parameter arg at position 1*",
             ]
         )
 
diff --git a/testing/test_assertion.py b/testing/test_assertion.py
index a9e624713..2c7f4b33d 100644
--- a/testing/test_assertion.py
+++ b/testing/test_assertion.py
@@ -1075,6 +1075,7 @@ def test_diff_newline_at_end(monkeypatch, testdir):
     )
 
 
+@pytest.mark.filterwarnings("default")
 def test_assert_tuple_warning(testdir):
     testdir.makepyfile(
         """
@@ -1084,7 +1085,7 @@ def test_assert_tuple_warning(testdir):
     )
     result = testdir.runpytest("-rw")
     result.stdout.fnmatch_lines(
-        ["*test_assert_tuple_warning.py:2", "*assertion is always true*"]
+        ["*test_assert_tuple_warning.py:2:*assertion is always true*"]
     )
 
 
diff --git a/testing/test_assertrewrite.py b/testing/test_assertrewrite.py
index c436ab0de..fdbaa9e90 100644
--- a/testing/test_assertrewrite.py
+++ b/testing/test_assertrewrite.py
@@ -759,16 +759,12 @@ def test_rewritten():
         testdir.makepyfile("import a_package_without_init_py.module")
         assert testdir.runpytest().ret == EXIT_NOTESTSCOLLECTED
 
-    def test_rewrite_warning(self, pytestconfig, monkeypatch):
+    def test_rewrite_warning(self, pytestconfig):
         hook = AssertionRewritingHook(pytestconfig)
-        warnings = []
+        from _pytest.warning_types import PytestWarning
 
-        def mywarn(code, msg):
-            warnings.append((code, msg))
-
-        monkeypatch.setattr(hook.config, "warn", mywarn)
-        hook.mark_rewrite("_pytest")
-        assert "_pytest" in warnings[0][1]
+        with pytest.warns(PytestWarning):
+            hook.mark_rewrite("_pytest")
 
     def test_rewrite_module_imported_from_conftest(self, testdir):
         testdir.makeconftest(
diff --git a/testing/test_cacheprovider.py b/testing/test_cacheprovider.py
index 23ec73599..c9d174229 100644
--- a/testing/test_cacheprovider.py
+++ b/testing/test_cacheprovider.py
@@ -31,6 +31,7 @@ class TestNewAPI(object):
         val = config.cache.get("key/name", -2)
         assert val == -2
 
+    @pytest.mark.filterwarnings("default")
     def test_cache_writefail_cachfile_silent(self, testdir):
         testdir.makeini("[pytest]")
         testdir.tmpdir.join(".pytest_cache").write("gone wrong")
diff --git a/testing/test_config.py b/testing/test_config.py
index ad7f35b57..c0630d688 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -135,13 +135,13 @@ class TestConfigCmdlineParsing(object):
         """
         )
         testdir.makefile(
-            ".cfg",
+            ".ini",
             custom="""
             [pytest]
             custom = 1
         """,
         )
-        config = testdir.parseconfig("-c", "custom.cfg")
+        config = testdir.parseconfig("-c", "custom.ini")
         assert config.getini("custom") == "1"
 
         testdir.makefile(
@@ -155,8 +155,8 @@ class TestConfigCmdlineParsing(object):
         assert config.getini("custom") == "1"
 
     def test_absolute_win32_path(self, testdir):
-        temp_cfg_file = testdir.makefile(
-            ".cfg",
+        temp_ini_file = testdir.makefile(
+            ".ini",
             custom="""
             [pytest]
             addopts = --version
@@ -164,8 +164,8 @@ class TestConfigCmdlineParsing(object):
         )
         from os.path import normpath
 
-        temp_cfg_file = normpath(str(temp_cfg_file))
-        ret = pytest.main("-c " + temp_cfg_file)
+        temp_ini_file = normpath(str(temp_ini_file))
+        ret = pytest.main(["-c", temp_ini_file])
         assert ret == _pytest.main.EXIT_OK
 
 
@@ -783,13 +783,14 @@ def test_collect_pytest_prefix_bug(pytestconfig):
     assert pm.parse_hookimpl_opts(Dummy(), "pytest_something") is None
 
 
-class TestWarning(object):
+class TestLegacyWarning(object):
+    @pytest.mark.filterwarnings("default")
     def test_warn_config(self, testdir):
         testdir.makeconftest(
             """
             values = []
-            def pytest_configure(config):
-                config.warn("C1", "hello")
+            def pytest_runtest_setup(item):
+                item.config.warn("C1", "hello")
             def pytest_logwarning(code, message):
                 if message == "hello" and code == "C1":
                     values.append(1)
@@ -802,9 +803,12 @@ class TestWarning(object):
                 assert conftest.values == [1]
         """
         )
-        reprec = testdir.inline_run()
-        reprec.assertoutcome(passed=1)
+        result = testdir.runpytest()
+        result.stdout.fnmatch_lines(
+            ["*hello", "*config.warn has been deprecated*", "*1 passed*"]
+        )
 
+    @pytest.mark.filterwarnings("default")
     def test_warn_on_test_item_from_request(self, testdir, request):
         testdir.makepyfile(
             """
@@ -819,7 +823,6 @@ class TestWarning(object):
         """
         )
         result = testdir.runpytest("--disable-pytest-warnings")
-        assert result.parseoutcomes()["warnings"] > 0
         assert "hello" not in result.stdout.str()
 
         result = testdir.runpytest()
@@ -828,6 +831,7 @@ class TestWarning(object):
             ===*warnings summary*===
             *test_warn_on_test_item_from_request.py::test_hello*
             *hello*
+            *test_warn_on_test_item_from_request.py:7:*Node.warn has been deprecated, use Node.std_warn instead*
         """
         )
 
@@ -847,7 +851,7 @@ class TestRootdir(object):
     @pytest.mark.parametrize("name", "setup.cfg tox.ini pytest.ini".split())
     def test_with_ini(self, tmpdir, name):
         inifile = tmpdir.join(name)
-        inifile.write("[pytest]\n")
+        inifile.write("[pytest]\n" if name != "setup.cfg" else "[tool:pytest]\n")
 
         a = tmpdir.mkdir("a")
         b = a.mkdir("b")
@@ -893,11 +897,14 @@ class TestRootdir(object):
 class TestOverrideIniArgs(object):
     @pytest.mark.parametrize("name", "setup.cfg tox.ini pytest.ini".split())
     def test_override_ini_names(self, testdir, name):
+        section = "[pytest]" if name != "setup.cfg" else "[tool:pytest]"
         testdir.tmpdir.join(name).write(
             textwrap.dedent(
                 """
-            [pytest]
-            custom = 1.0"""
+            {section}
+            custom = 1.0""".format(
+                    section=section
+                )
             )
         )
         testdir.makeconftest(
diff --git a/testing/test_junitxml.py b/testing/test_junitxml.py
index 0678d59e8..04b4ee2d7 100644
--- a/testing/test_junitxml.py
+++ b/testing/test_junitxml.py
@@ -1005,6 +1005,7 @@ def test_record_property_same_name(testdir):
     pnodes[1].assert_attr(name="foo", value="baz")
 
 
+@pytest.mark.filterwarnings("default")
 def test_record_attribute(testdir):
     testdir.makepyfile(
         """
@@ -1023,7 +1024,10 @@ def test_record_attribute(testdir):
     tnode.assert_attr(bar="1")
     tnode.assert_attr(foo="<1")
     result.stdout.fnmatch_lines(
-        ["test_record_attribute.py::test_record", "*record_xml_attribute*experimental*"]
+        [
+            "test_record_attribute.py::test_record",
+            "*test_record_attribute.py:6:*record_xml_attribute is an experimental feature",
+        ]
     )
 
 
diff --git a/testing/test_resultlog.py b/testing/test_resultlog.py
index 173384ffb..1bb0cca48 100644
--- a/testing/test_resultlog.py
+++ b/testing/test_resultlog.py
@@ -13,6 +13,9 @@ from _pytest.resultlog import (
 )
 
 
+pytestmark = pytest.mark.filterwarnings("ignore:--result-log is deprecated")
+
+
 def test_generic_path(testdir):
     from _pytest.main import Session
 
diff --git a/testing/test_warnings.py b/testing/test_warnings.py
index 3bd7bb52e..eb7033f1d 100644
--- a/testing/test_warnings.py
+++ b/testing/test_warnings.py
@@ -37,7 +37,7 @@ def pyfile_with_warnings(testdir, request):
     )
 
 
-@pytest.mark.filterwarnings("always")
+@pytest.mark.filterwarnings("default")
 def test_normal_flow(testdir, pyfile_with_warnings):
     """
     Check that the warnings section is displayed, containing test node ids followed by
diff --git a/tox.ini b/tox.ini
index fbc5d4779..d1e251e99 100644
--- a/tox.ini
+++ b/tox.ini
@@ -218,6 +218,9 @@ norecursedirs = .tox ja .hg cx_freeze_source testing/example_scripts
 xfail_strict=true
 filterwarnings =
     error
+    ignore:yield tests are deprecated, and scheduled to be removed in pytest 4.0:
+    ignore:Metafunc.addcall is deprecated and scheduled to be removed in pytest 4.0:
+    ignore:Module already imported so cannot be rewritten:
     # produced by path.local
     ignore:bad escape.*:DeprecationWarning:re
     # produced by path.readlines