intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

30 files changed, 820 insertions, 0 deletions

diff --git a/library/python/runtime_py3/test/.dist-info/METADATA b/library/python/runtime_py3/test/.dist-info/METADATA
new file mode 100644
index 00000000000..bb361621993
--- /dev/null
+++ b/library/python/runtime_py3/test/.dist-info/METADATA
@@ -0,0 +1,14 @@
+Metadata-Version: 2.1
+Name: foo-bar
+Version: 1.2.3
+Summary: 
+Home-page: https://foo.org/
+Author: Foo
+Author-email: [email protected]
+License: UNKNOWN
+Platform: any
+Classifier: Development Status :: 4 - Beta
+Classifier: Programming Language :: Python :: 3
+Requires-Python: >=3.8
+Requires-Dist: Werkzeug (>=0.15)
+Requires-Dist: Jinja2 (>=2.10.1)
diff --git a/library/python/runtime_py3/test/.dist-info/RECORD b/library/python/runtime_py3/test/.dist-info/RECORD
new file mode 100644
index 00000000000..dabbbff80d9
--- /dev/null
+++ b/library/python/runtime_py3/test/.dist-info/RECORD
@@ -0,0 +1 @@
+foo_bar.py,sha256=0000000000000000000000000000000000000000000,20
diff --git a/library/python/runtime_py3/test/.dist-info/entry_points.txt b/library/python/runtime_py3/test/.dist-info/entry_points.txt
new file mode 100644
index 00000000000..f5e2fd2657b
--- /dev/null
+++ b/library/python/runtime_py3/test/.dist-info/entry_points.txt
@@ -0,0 +1,2 @@
+[console_scripts]
+foo_cli = foo_bar:cli
diff --git a/library/python/runtime_py3/test/.dist-info/top_level.txt b/library/python/runtime_py3/test/.dist-info/top_level.txt
new file mode 100644
index 00000000000..d2c068bc6be
--- /dev/null
+++ b/library/python/runtime_py3/test/.dist-info/top_level.txt
@@ -0,0 +1 @@
+foo_bar
diff --git a/library/python/runtime_py3/test/canondata/result.json b/library/python/runtime_py3/test/canondata/result.json
new file mode 100644
index 00000000000..a7d045fc9c9
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/result.json
@@ -0,0 +1,62 @@
+{
+    "test_traceback.test_traceback[custom-default]": {
+        "stderr": {
+            "checksum": "6c1a9b47baa51cc6903b85fd43c529b5",
+            "uri": "file://test_traceback.test_traceback_custom-default_/stderr.txt"
+        },
+        "stdout": {
+            "checksum": "e120a1e0b7fdddc8e6b4d4b506403e89",
+            "uri": "file://test_traceback.test_traceback_custom-default_/stdout.txt"
+        }
+    },
+    "test_traceback.test_traceback[custom-ultratb_color]": {
+        "stderr": {
+            "checksum": "048e27049fb8db64bd295b17f505b0ad",
+            "uri": "file://test_traceback.test_traceback_custom-ultratb_color_/stderr.txt"
+        },
+        "stdout": {
+            "checksum": "e120a1e0b7fdddc8e6b4d4b506403e89",
+            "uri": "file://test_traceback.test_traceback_custom-ultratb_color_/stdout.txt"
+        }
+    },
+    "test_traceback.test_traceback[custom-ultratb_verbose]": {
+        "stderr": {
+            "checksum": "e9af42aa3736141d9b67a1652eea412e",
+            "uri": "file://test_traceback.test_traceback_custom-ultratb_verbose_/stderr.txt"
+        },
+        "stdout": {
+            "checksum": "e120a1e0b7fdddc8e6b4d4b506403e89",
+            "uri": "file://test_traceback.test_traceback_custom-ultratb_verbose_/stdout.txt"
+        }
+    },
+    "test_traceback.test_traceback[main-default]": {
+        "stderr": {
+            "checksum": "6c1a9b47baa51cc6903b85fd43c529b5",
+            "uri": "file://test_traceback.test_traceback_main-default_/stderr.txt"
+        },
+        "stdout": {
+            "checksum": "e120a1e0b7fdddc8e6b4d4b506403e89",
+            "uri": "file://test_traceback.test_traceback_main-default_/stdout.txt"
+        }
+    },
+    "test_traceback.test_traceback[main-ultratb_color]": {
+        "stderr": {
+            "checksum": "048e27049fb8db64bd295b17f505b0ad",
+            "uri": "file://test_traceback.test_traceback_main-ultratb_color_/stderr.txt"
+        },
+        "stdout": {
+            "checksum": "e120a1e0b7fdddc8e6b4d4b506403e89",
+            "uri": "file://test_traceback.test_traceback_main-ultratb_color_/stdout.txt"
+        }
+    },
+    "test_traceback.test_traceback[main-ultratb_verbose]": {
+        "stderr": {
+            "checksum": "e9af42aa3736141d9b67a1652eea412e",
+            "uri": "file://test_traceback.test_traceback_main-ultratb_verbose_/stderr.txt"
+        },
+        "stdout": {
+            "checksum": "e120a1e0b7fdddc8e6b4d4b506403e89",
+            "uri": "file://test_traceback.test_traceback_main-ultratb_verbose_/stdout.txt"
+        }
+    }
+}
\ No newline at end of file
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-default_/stderr.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-default_/stderr.txt
new file mode 100644
index 00000000000..5eb7da170ad
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-default_/stderr.txt
@@ -0,0 +1,12 @@
+Traceback (most recent call last):
+  File "library/python/runtime_py3/test/traceback/crash.py", line 44, in main
+    one()
+  File "library/python/runtime_py3/test/traceback/crash.py", line 12, in one
+    modfunc(two)  # aaa
+  File "library/python/runtime_py3/test/traceback/mod/__init__.py", line 3, in modfunc
+    f()  # call back to caller
+  File "library/python/runtime_py3/test/traceback/crash.py", line 16, in two
+    three(42)
+  File "library/python/runtime_py3/test/traceback/crash.py", line 20, in three
+    raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+RuntimeError: Kaboom! I'm dead: 42
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-default_/stdout.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-default_/stdout.txt
new file mode 100644
index 00000000000..2c9793eb147
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-default_/stdout.txt
@@ -0,0 +1,2 @@
+__name__ = library.python.runtime_py3.test.traceback.crash
+__file__ = library/python/runtime_py3/test/traceback/crash.py
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_color_/stderr.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_color_/stderr.txt
new file mode 100644
index 00000000000..9e5a474cbd7
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_color_/stderr.txt
@@ -0,0 +1,13 @@
+Traceback (most recent call last):
+  File "library/python/runtime_py3/test/traceback/crash.py", line 44, in main
+    one()
+  File "library/python/runtime_py3/test/traceback/crash.py", line 12, in one
+    modfunc(two)  # aaa
+  File "library/python/runtime_py3/test/traceback/mod/__init__.py", line 3, in modfunc
+    f()  # call back to caller
+  File "library/python/runtime_py3/test/traceback/crash.py", line 16, in two
+    three(42)
+  File "library/python/runtime_py3/test/traceback/crash.py", line 20, in three
+    raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+RuntimeError: Kaboom! I'm dead: 42
+
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_color_/stdout.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_color_/stdout.txt
new file mode 100644
index 00000000000..2c9793eb147
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_color_/stdout.txt
@@ -0,0 +1,2 @@
+__name__ = library.python.runtime_py3.test.traceback.crash
+__file__ = library/python/runtime_py3/test/traceback/crash.py
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_verbose_/stderr.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_verbose_/stderr.txt
new file mode 100644
index 00000000000..b0b299ebe6d
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_verbose_/stderr.txt
@@ -0,0 +1,41 @@
+---------------------------------------------------------------------------
+RuntimeError                              Traceback (most recent call last)
+library/python/runtime_py3/test/traceback/crash.py in main()
+     42     sys.executable = '<traceback test>'
+     43 
+---> 44     one()
+        global one = <function one>
+
+library/python/runtime_py3/test/traceback/crash.py in one()
+     10 
+     11 def one():
+---> 12     modfunc(two)  # aaa
+        global modfunc = <function modfunc>
+        global two = <function two>
+     13 
+     14 
+
+library/python/runtime_py3/test/traceback/mod/__init__.py in modfunc(f=<function two>)
+      1 def modfunc(f):
+      2     # lalala
+----> 3     f()  # call back to caller
+        f = <function two>
+
+library/python/runtime_py3/test/traceback/crash.py in two()
+     14 
+     15 def two():
+---> 16     three(42)
+        global three = <function three>
+     17 
+     18 
+
+library/python/runtime_py3/test/traceback/crash.py in three(x=42)
+     18 
+     19 def three(x):
+---> 20     raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+        global RuntimeError.format = undefined
+        x = 42
+     21 
+     22 
+
+RuntimeError: Kaboom! I'm dead: 42
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_verbose_/stdout.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_verbose_/stdout.txt
new file mode 100644
index 00000000000..2c9793eb147
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_custom-ultratb_verbose_/stdout.txt
@@ -0,0 +1,2 @@
+__name__ = library.python.runtime_py3.test.traceback.crash
+__file__ = library/python/runtime_py3/test/traceback/crash.py
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-default_/stderr.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-default_/stderr.txt
new file mode 100644
index 00000000000..5eb7da170ad
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-default_/stderr.txt
@@ -0,0 +1,12 @@
+Traceback (most recent call last):
+  File "library/python/runtime_py3/test/traceback/crash.py", line 44, in main
+    one()
+  File "library/python/runtime_py3/test/traceback/crash.py", line 12, in one
+    modfunc(two)  # aaa
+  File "library/python/runtime_py3/test/traceback/mod/__init__.py", line 3, in modfunc
+    f()  # call back to caller
+  File "library/python/runtime_py3/test/traceback/crash.py", line 16, in two
+    three(42)
+  File "library/python/runtime_py3/test/traceback/crash.py", line 20, in three
+    raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+RuntimeError: Kaboom! I'm dead: 42
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-default_/stdout.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-default_/stdout.txt
new file mode 100644
index 00000000000..2c9793eb147
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-default_/stdout.txt
@@ -0,0 +1,2 @@
+__name__ = library.python.runtime_py3.test.traceback.crash
+__file__ = library/python/runtime_py3/test/traceback/crash.py
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_color_/stderr.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_color_/stderr.txt
new file mode 100644
index 00000000000..9e5a474cbd7
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_color_/stderr.txt
@@ -0,0 +1,13 @@
+Traceback (most recent call last):
+  File "library/python/runtime_py3/test/traceback/crash.py", line 44, in main
+    one()
+  File "library/python/runtime_py3/test/traceback/crash.py", line 12, in one
+    modfunc(two)  # aaa
+  File "library/python/runtime_py3/test/traceback/mod/__init__.py", line 3, in modfunc
+    f()  # call back to caller
+  File "library/python/runtime_py3/test/traceback/crash.py", line 16, in two
+    three(42)
+  File "library/python/runtime_py3/test/traceback/crash.py", line 20, in three
+    raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+RuntimeError: Kaboom! I'm dead: 42
+
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_color_/stdout.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_color_/stdout.txt
new file mode 100644
index 00000000000..2c9793eb147
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_color_/stdout.txt
@@ -0,0 +1,2 @@
+__name__ = library.python.runtime_py3.test.traceback.crash
+__file__ = library/python/runtime_py3/test/traceback/crash.py
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_verbose_/stderr.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_verbose_/stderr.txt
new file mode 100644
index 00000000000..b0b299ebe6d
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_verbose_/stderr.txt
@@ -0,0 +1,41 @@
+---------------------------------------------------------------------------
+RuntimeError                              Traceback (most recent call last)
+library/python/runtime_py3/test/traceback/crash.py in main()
+     42     sys.executable = '<traceback test>'
+     43 
+---> 44     one()
+        global one = <function one>
+
+library/python/runtime_py3/test/traceback/crash.py in one()
+     10 
+     11 def one():
+---> 12     modfunc(two)  # aaa
+        global modfunc = <function modfunc>
+        global two = <function two>
+     13 
+     14 
+
+library/python/runtime_py3/test/traceback/mod/__init__.py in modfunc(f=<function two>)
+      1 def modfunc(f):
+      2     # lalala
+----> 3     f()  # call back to caller
+        f = <function two>
+
+library/python/runtime_py3/test/traceback/crash.py in two()
+     14 
+     15 def two():
+---> 16     three(42)
+        global three = <function three>
+     17 
+     18 
+
+library/python/runtime_py3/test/traceback/crash.py in three(x=42)
+     18 
+     19 def three(x):
+---> 20     raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+        global RuntimeError.format = undefined
+        x = 42
+     21 
+     22 
+
+RuntimeError: Kaboom! I'm dead: 42
diff --git a/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_verbose_/stdout.txt b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_verbose_/stdout.txt
new file mode 100644
index 00000000000..2c9793eb147
--- /dev/null
+++ b/library/python/runtime_py3/test/canondata/test_traceback.test_traceback_main-ultratb_verbose_/stdout.txt
@@ -0,0 +1,2 @@
+__name__ = library.python.runtime_py3.test.traceback.crash
+__file__ = library/python/runtime_py3/test/traceback/crash.py
diff --git a/library/python/runtime_py3/test/resources/__init__.py b/library/python/runtime_py3/test/resources/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/library/python/runtime_py3/test/resources/__init__.py
diff --git a/library/python/runtime_py3/test/resources/foo.txt b/library/python/runtime_py3/test/resources/foo.txt
new file mode 100644
index 00000000000..ba0e162e1c4
--- /dev/null
+++ b/library/python/runtime_py3/test/resources/foo.txt
@@ -0,0 +1 @@
+bar
\ No newline at end of file
diff --git a/library/python/runtime_py3/test/resources/submodule/__init__.py b/library/python/runtime_py3/test/resources/submodule/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
--- /dev/null
+++ b/library/python/runtime_py3/test/resources/submodule/__init__.py
diff --git a/library/python/runtime_py3/test/resources/submodule/bar.txt b/library/python/runtime_py3/test/resources/submodule/bar.txt
new file mode 100644
index 00000000000..19102815663
--- /dev/null
+++ b/library/python/runtime_py3/test/resources/submodule/bar.txt
@@ -0,0 +1 @@
+foo
\ No newline at end of file
diff --git a/library/python/runtime_py3/test/test_arcadia_source_finder.py b/library/python/runtime_py3/test/test_arcadia_source_finder.py
new file mode 100644
index 00000000000..ff80d0a0a23
--- /dev/null
+++ b/library/python/runtime_py3/test/test_arcadia_source_finder.py
@@ -0,0 +1,317 @@
+import unittest
+import yaml
+from unittest.mock import patch
+from parameterized import parameterized
+
+import __res as res
+
+
+NAMESPACE_PREFIX = b'py/namespace/'
+TEST_SOURCE_ROOT = '/home/arcadia'
+
+
+class ImporterMocks(object):
+    def __init__(self, mock_fs, mock_resources):
+        self._mock_fs = mock_fs
+        self._mock_resources = mock_resources
+        self._patchers = [
+            patch('__res.iter_keys', wraps=self._iter_keys),
+            patch('__res.__resource.find', wraps=self._resource_find),
+            patch('__res._path_isdir', wraps=self._path_isdir),
+            patch('__res._path_isfile', wraps=self._path_isfile),
+            patch('__res._os.listdir', wraps=self._os_listdir),
+        ]
+        for patcher in self._patchers:
+            patcher.start()
+
+    def stop(self):
+        for patcher in self._patchers:
+            patcher.stop()
+
+    def _iter_keys(self, prefix):
+        assert prefix == NAMESPACE_PREFIX
+        l = len(prefix)
+        for k in self._mock_resources.keys():
+            yield k, k[l:]
+
+    def _resource_find(self, key):
+        return self._mock_resources.get(key)
+
+    def _lookup_mock_fs(self, filename):
+        path = filename.lstrip('/').split('/')
+        curdir = self._mock_fs
+        for item in path:
+            if item in curdir:
+                curdir = curdir[item]
+            else:
+                return None
+        return curdir
+
+    def _path_isfile(self, filename):
+        f = self._lookup_mock_fs(filename)
+        return isinstance(f, str)
+
+    def _path_isdir(self, filename):
+        f = self._lookup_mock_fs(filename)
+        return isinstance(f, dict)
+
+    def _os_listdir(self, dirname):
+        f = self._lookup_mock_fs(dirname)
+        if isinstance(f, dict):
+            return f.keys()
+        else:
+            return []
+
+
+class ArcadiaSourceFinderTestCase(unittest.TestCase):
+    def setUp(self):
+        self.import_mock = ImporterMocks(yaml.safe_load(self._get_mock_fs()), self._get_mock_resources())
+        self.arcadia_source_finder = res.ArcadiaSourceFinder(TEST_SOURCE_ROOT)
+
+    def tearDown(self):
+        self.import_mock.stop()
+
+    def _get_mock_fs(self):
+        raise NotImplementedError()
+
+    def _get_mock_resources(self):
+        raise NotImplementedError()
+
+
+class TestLibraryWithoutNamespace(ArcadiaSourceFinderTestCase):
+    def _get_mock_fs(self):
+        return '''
+           home:
+             arcadia:
+               project:
+                 lib:
+                   mod1.py: ""
+                   package1:
+                     mod2.py: ""
+        '''
+
+    def _get_mock_resources(self):
+        return {
+            b'py/namespace/unique_prefix1/project/lib': b'project.lib.',
+        }
+
+    @parameterized.expand([
+        ('project.lib.mod1', b'project/lib/mod1.py'),
+        ('project.lib.package1.mod2', b'project/lib/package1/mod2.py'),
+        ('project.lib.unknown_module', None),
+        ('project.lib', None),  # package
+    ])
+    def test_get_module_path(self, module, path):
+        assert path == self.arcadia_source_finder.get_module_path(module)
+
+    @parameterized.expand([
+        ('project.lib.mod1', False),
+        ('project.lib.package1.mod2', False),
+        ('project', True),
+        ('project.lib', True),
+        ('project.lib.package1', True),
+    ])
+    def test_is_packages(self, module, is_package):
+        assert is_package == self.arcadia_source_finder.is_package(module)
+
+    def test_is_package_for_unknown_module(self):
+        self.assertRaises(ImportError, lambda: self.arcadia_source_finder.is_package('project.lib.package2'))
+
+    @parameterized.expand([
+        ('', {
+            ('PFX.project', True),
+        }),
+        ('project.', {
+            ('PFX.lib', True),
+        }),
+        ('project.lib.', {
+            ('PFX.mod1', False),
+            ('PFX.package1', True),
+        }),
+        ('project.lib.package1.', {
+            ('PFX.mod2', False),
+        }),
+    ])
+    def test_iter_modules(self, package_prefix, expected):
+        got = self.arcadia_source_finder.iter_modules(package_prefix, 'PFX.')
+        assert expected == set(got)
+
+    # Check iter_modules() don't crash and return correct result after not existing module was requested
+    def test_iter_modules_after_unknown_module_import(self):
+        self.arcadia_source_finder.get_module_path('project.unknown_module')
+        assert {('lib', True)} == set(self.arcadia_source_finder.iter_modules('project.', ''))
+
+
+class TestLibraryExtendedFromAnotherLibrary(ArcadiaSourceFinderTestCase):
+    def _get_mock_fs(self):
+        return '''
+           home:
+             arcadia:
+               project:
+                 lib:
+                   mod1.py: ''
+                 lib_extension:
+                   mod2.py: ''
+        '''
+
+    def _get_mock_resources(self):
+        return {
+            b'py/namespace/unique_prefix1/project/lib': b'project.lib.',
+            b'py/namespace/unique_prefix2/project/lib_extension': b'project.lib.',
+        }
+
+    @parameterized.expand([
+        ('project.lib.mod1', b'project/lib/mod1.py'),
+        ('project.lib.mod2', b'project/lib_extension/mod2.py'),
+    ])
+    def test_get_module_path(self, module, path):
+        assert path == self.arcadia_source_finder.get_module_path(module)
+
+    @parameterized.expand([
+        ('project.lib.', {
+            ('PFX.mod1', False),
+            ('PFX.mod2', False),
+        }),
+    ])
+    def test_iter_modules(self, package_prefix, expected):
+        got = self.arcadia_source_finder.iter_modules(package_prefix, 'PFX.')
+        assert expected == set(got)
+
+
+class TestNamespaceAndTopLevelLibraries(ArcadiaSourceFinderTestCase):
+    def _get_mock_fs(self):
+        return '''
+           home:
+             arcadia:
+               project:
+                 ns_lib:
+                   mod1.py: ''
+                 top_level_lib:
+                   mod2.py: ''
+        '''
+
+    def _get_mock_resources(self):
+        return {
+            b'py/namespace/unique_prefix1/project/ns_lib': b'ns.',
+            b'py/namespace/unique_prefix2/project/top_level_lib': b'.',
+        }
+
+    @parameterized.expand([
+        ('ns.mod1', b'project/ns_lib/mod1.py'),
+        ('mod2', b'project/top_level_lib/mod2.py'),
+    ])
+    def test_get_module_path(self, module, path):
+        assert path == self.arcadia_source_finder.get_module_path(module)
+
+    @parameterized.expand([
+        ('ns', True),
+        ('ns.mod1', False),
+        ('mod2', False),
+    ])
+    def test_is_packages(self, module, is_package):
+        assert is_package == self.arcadia_source_finder.is_package(module)
+
+    @parameterized.expand([
+        'project',
+        'project.ns_lib',
+        'project.top_level_lib',
+    ])
+    def test_is_package_for_unknown_modules(self, module):
+        self.assertRaises(ImportError, lambda: self.arcadia_source_finder.is_package(module))
+
+    @parameterized.expand([
+        ('', {
+            ('PFX.ns', True),
+            ('PFX.mod2', False),
+        }),
+        ('ns.', {
+            ('PFX.mod1', False),
+        }),
+    ])
+    def test_iter_modules(self, package_prefix, expected):
+        got = self.arcadia_source_finder.iter_modules(package_prefix, 'PFX.')
+        assert expected == set(got)
+
+
+class TestIgnoreDirectoriesWithYaMakeFile(ArcadiaSourceFinderTestCase):
+    ''' Packages and modules from tests should not be part of pylib namespace '''
+    def _get_mock_fs(self):
+        return '''
+           home:
+             arcadia:
+               contrib:
+                 python:
+                   pylib:
+                     mod1.py: ""
+                     tests:
+                       conftest.py: ""
+                       ya.make: ""
+        '''
+
+    def _get_mock_resources(self):
+        return {
+            b'py/namespace/unique_prefix1/contrib/python/pylib': b'pylib.',
+        }
+
+    def test_get_module_path_for_lib(self):
+        assert b'contrib/python/pylib/mod1.py' == self.arcadia_source_finder.get_module_path('pylib.mod1')
+
+    def test_get_module_for_tests(self):
+        assert self.arcadia_source_finder.get_module_path('pylib.tests.conftest') is None
+
+    def test_is_package_for_tests(self):
+        self.assertRaises(ImportError, lambda: self.arcadia_source_finder.is_package('pylib.tests'))
+
+
+class TestMergingNamespaceAndDirectoryPackages(ArcadiaSourceFinderTestCase):
+    ''' Merge parent package (top level in this test) dirs with namespace dirs (DEVTOOLS-8979) '''
+    def _get_mock_fs(self):
+        return '''
+           home:
+             arcadia:
+               contrib:
+                 python:
+                   pylint:
+                     ya.make: ""
+                     pylint:
+                       __init__.py: ""
+                     patcher:
+                       patch.py: ""
+                       ya.make: ""
+        '''
+
+    def _get_mock_resources(self):
+        return {
+            b'py/namespace/unique_prefix1/contrib/python/pylint': b'.',
+            b'py/namespace/unique_prefix1/contrib/python/pylint/patcher': b'pylint.',
+        }
+
+    @parameterized.expand([
+        ('pylint.__init__', b'contrib/python/pylint/pylint/__init__.py'),
+        ('pylint.patch', b'contrib/python/pylint/patcher/patch.py'),
+    ])
+    def test_get_module_path(self, module, path):
+        assert path == self.arcadia_source_finder.get_module_path(module)
+
+
+class TestEmptyResources(ArcadiaSourceFinderTestCase):
+    def _get_mock_fs(self):
+        return '''
+           home:
+             arcadia:
+               project:
+                 lib:
+                   mod1.py: ''
+        '''
+
+    def _get_mock_resources(self):
+        return {}
+
+    def test_get_module_path(self):
+        assert self.arcadia_source_finder.get_module_path('project.lib.mod1') is None
+
+    def test_is_package(self):
+        self.assertRaises(ImportError, lambda: self.arcadia_source_finder.is_package('project'))
+
+    def test_iter_modules(self):
+        assert [] == list(self.arcadia_source_finder.iter_modules('', 'PFX.'))
diff --git a/library/python/runtime_py3/test/test_metadata.py b/library/python/runtime_py3/test/test_metadata.py
new file mode 100644
index 00000000000..686c176468e
--- /dev/null
+++ b/library/python/runtime_py3/test/test_metadata.py
@@ -0,0 +1,44 @@
+import importlib.metadata as im
+
+import pytest
+
+
[email protected]("name", ("foo-bar", "foo_bar", "Foo-Bar"))
+def test_distribution(name):
+    assert im.distribution(name) is not None
+
+
+def test_unknown_package():
+    with pytest.raises(im.PackageNotFoundError):
+        im.distribution("bar")
+
+
+def test_version():
+    assert im.version("foo-bar") == "1.2.3"
+
+
+def test_metadata():
+    assert im.metadata("foo-bar") is not None
+
+
+def test_files():
+    files = im.files("foo-bar")
+    assert len(files) == 1
+    assert files[0].name == "foo_bar.py"
+    assert files[0].size == 20
+
+
+def test_requires():
+    assert im.requires("foo-bar") == ["Werkzeug (>=0.15)", "Jinja2 (>=2.10.1)"]
+
+
+def test_entry_points():
+    entry_points = im.entry_points()
+    assert "console_scripts" in entry_points
+
+    flg_found = False
+    for entry_point in entry_points["console_scripts"]:
+        if entry_point.name == "foo_cli" and entry_point.value == "foo_bar:cli":
+            flg_found = True
+
+    assert flg_found
diff --git a/library/python/runtime_py3/test/test_resources.py b/library/python/runtime_py3/test/test_resources.py
new file mode 100644
index 00000000000..a269329f42c
--- /dev/null
+++ b/library/python/runtime_py3/test/test_resources.py
@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+
+import importlib.resources as ir
+
+import pytest
+
+
[email protected]("package, resource", (
+    ("resources", "foo.txt"),
+    ("resources.submodule", "bar.txt")
+))
+def test_is_resource_good_path(package, resource):
+    assert ir.is_resource(package, resource)
+
+
[email protected]("package, resource", (
+    ("resources", "111.txt"),
+    ("resources.submodule", "222.txt")
+))
+def test_is_resource_missing(package, resource):
+    assert not ir.is_resource(package, resource)
+
+
+def test_is_resource_subresource_directory():
+    # Directories are not resources.
+    assert not ir.is_resource("resources", "submodule")
+
+
[email protected]("package, resource, expected", (
+    ("resources", "foo.txt", b"bar"),
+    ("resources.submodule", "bar.txt", b"foo")
+))
+def test_read_binary_good_path(package, resource, expected):
+    assert ir.read_binary(package, resource) == expected
+
+
+def test_read_binary_missing():
+    with pytest.raises(FileNotFoundError):
+        ir.read_binary("resources", "111.txt")
+
+
[email protected]("package, resource, expected", (
+    ("resources", "foo.txt", "bar"),
+    ("resources.submodule", "bar.txt", "foo")
+))
+def test_read_text_good_path(package, resource, expected):
+    assert ir.read_text(package, resource) == expected
+
+
+def test_read_text_missing():
+    with pytest.raises(FileNotFoundError):
+        ir.read_text("resources", "111.txt")
+
+
[email protected]("package, expected", (
+    ("resources", ["submodule", "foo.txt"]),
+    ("resources.submodule", ["bar.txt"])
+))
+def test_contents_good_path(package, expected):
+    assert sorted(ir.contents(package)) == sorted(expected)
diff --git a/library/python/runtime_py3/test/test_traceback.py b/library/python/runtime_py3/test/test_traceback.py
new file mode 100644
index 00000000000..82087ce98a6
--- /dev/null
+++ b/library/python/runtime_py3/test/test_traceback.py
@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+
+from __future__ import print_function, absolute_import, division
+
+import os
+import re
+
+import pytest
+
+import yatest.common as yc
+
+
+def clean_traceback(traceback):
+    traceback = re.sub(br'\033\[(\d|;)+?m', b'', traceback)  # strip ANSI codes
+    traceback = re.sub(br' at 0x[0-9a-fA-F]+', b'', traceback)  # remove object ids
+    return traceback
+
+
[email protected]('mode', [
+    'default',
+    'ultratb_color',
+    'ultratb_verbose',
+])
[email protected]('entry_point', [
+    'main',
+    'custom',
+])
+def test_traceback(mode, entry_point):
+    tb_tool = yc.build_path('library/python/runtime_py3/test/traceback/traceback')
+    stdout_path = yc.test_output_path('stdout_raw.txt')
+    stderr_path = yc.test_output_path('stderr_raw.txt')
+    filtered_stdout_path = yc.test_output_path('stdout.txt')
+    filtered_stderr_path = yc.test_output_path('stderr.txt')
+
+    env = os.environ.copy()
+    env.pop('PYTHONPATH', None)  # Do not let program peek into its sources on filesystem
+    if entry_point == 'custom':
+        env['Y_PYTHON_ENTRY_POINT'] = 'library.python.runtime_py3.test.traceback.crash:main'
+
+    proc = yc.execute(
+        command=[tb_tool, mode],
+        env=env,
+        stdout=stdout_path,
+        stderr=stderr_path,
+        check_exit_code=False,
+    )
+
+    with open(filtered_stdout_path, 'wb') as f:
+        f.write(clean_traceback(proc.std_out))
+
+    with open(filtered_stderr_path, 'wb') as f:
+        f.write(clean_traceback(proc.std_err))
+
+    return {
+        'stdout': yc.canonical_file(
+            filtered_stdout_path,
+            local=True,
+        ),
+        'stderr': yc.canonical_file(
+            filtered_stderr_path,
+            local=True,
+        ),
+    }
diff --git a/library/python/runtime_py3/test/traceback/__main__.py b/library/python/runtime_py3/test/traceback/__main__.py
new file mode 100644
index 00000000000..364db169f09
--- /dev/null
+++ b/library/python/runtime_py3/test/traceback/__main__.py
@@ -0,0 +1,4 @@
+from library.python.runtime_py3.test.traceback.crash import main
+
+if __name__ == "__main__":
+    main()
diff --git a/library/python/runtime_py3/test/traceback/crash.py b/library/python/runtime_py3/test/traceback/crash.py
new file mode 100644
index 00000000000..b5e36b3dd46
--- /dev/null
+++ b/library/python/runtime_py3/test/traceback/crash.py
@@ -0,0 +1,44 @@
+import argparse
+import cgitb
+import sys
+import time
+
+from IPython.core import ultratb
+
+from .mod import modfunc
+
+
+def one():
+    modfunc(two)  # aaa
+
+
+def two():
+    three(42)
+
+
+def three(x):
+    raise RuntimeError('Kaboom! I\'m dead: {}'.format(x))
+
+
+def main():
+    hooks = {
+        'default': lambda: sys.excepthook,
+        'cgitb': lambda: cgitb.Hook(format='text'),
+        'ultratb_color': lambda: ultratb.ColorTB(ostream=sys.stderr),
+        'ultratb_verbose': lambda: ultratb.VerboseTB(ostream=sys.stderr),
+    }
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('hook', choices=sorted(hooks), default='default')
+
+    args = parser.parse_args()
+
+    sys.excepthook = hooks[args.hook]()
+
+    print('__name__ =', __name__)
+    print('__file__ =', __file__)
+
+    time.time = lambda: 1531996624.0  # Freeze time
+    sys.executable = '<traceback test>'
+
+    one()
diff --git a/library/python/runtime_py3/test/traceback/mod/__init__.py b/library/python/runtime_py3/test/traceback/mod/__init__.py
new file mode 100644
index 00000000000..f00843d7861
--- /dev/null
+++ b/library/python/runtime_py3/test/traceback/mod/__init__.py
@@ -0,0 +1,3 @@
+def modfunc(f):
+    # lalala
+    f()  # call back to caller
diff --git a/library/python/runtime_py3/test/traceback/ya.make b/library/python/runtime_py3/test/traceback/ya.make
new file mode 100644
index 00000000000..b61fe9550bb
--- /dev/null
+++ b/library/python/runtime_py3/test/traceback/ya.make
@@ -0,0 +1,19 @@
+PY3_PROGRAM()
+
+OWNER(
+    abodrov
+    borman
+)
+
+PEERDIR(
+    contrib/python/ipython
+)
+
+PY_SRCS(
+    MAIN
+    __main__.py=main
+    crash.py
+    mod/__init__.py
+)
+
+END()
diff --git a/library/python/runtime_py3/test/ya.make b/library/python/runtime_py3/test/ya.make
new file mode 100644
index 00000000000..4ec3db74f5d
--- /dev/null
+++ b/library/python/runtime_py3/test/ya.make
@@ -0,0 +1,40 @@
+PY3TEST()
+
+OWNER(
+    abodrov
+    borman
+)
+
+DEPENDS(library/python/runtime_py3/test/traceback)
+
+PEERDIR(
+    contrib/python/parameterized
+    contrib/python/PyYAML
+)
+
+PY_SRCS(
+    TOP_LEVEL
+    resources/__init__.py
+    resources/submodule/__init__.py
+)
+
+TEST_SRCS(
+    test_metadata.py
+    test_resources.py
+    test_traceback.py
+    test_arcadia_source_finder.py
+)
+
+RESOURCE_FILES(
+    PREFIX library/python/runtime_py3/test/
+    .dist-info/METADATA
+    .dist-info/RECORD
+    .dist-info/entry_points.txt
+    .dist-info/top_level.txt
+    resources/foo.txt
+    resources/submodule/bar.txt
+)
+
+END()
+
+RECURSE_FOR_TESTS(traceback)