[python] PCQA-1466 allow running Python 2 helpers tests

(cherry picked from commit 1aeb8996b00683167c278ba924ab370059248c76)

IJ-MR-187159

GitOrigin-RevId: 2fa35f5adbf8e10e82689f04eddf4a35e4ac8ecf

python/helpersTests/requirements-py2.txt

@@ -0,0 +1,2 @@
+behave==1.3.3
+pytest==4.6.11

python/helpersTests/run_python2_tests.py

@@ -0,0 +1,19 @@
+import os
+import sys
+
+import pytest
+
+
+current_dir = os.path.dirname(os.path.abspath(__file__))
+python_plugin_dir = os.path.abspath(os.path.join(current_dir, '..'))
+
+helpers_dir = os.path.join(python_plugin_dir, "helpers")
+pycharm_dir = os.path.join(helpers_dir, "pycharm")
+py3only_dir = os.path.join(helpers_dir, "py3only")
+
+sys.path.insert(0, helpers_dir)
+sys.path.insert(0, pycharm_dir)
+sys.path.insert(0, py3only_dir)
+
+exit_code = pytest.main(["--junit-xml=.tox/reports/junit-py27.xml", "tests"])
+sys.exit(exit_code)

python/helpersTests/tests/pycharm/test_jb_unittest_runner.py

@@ -5,6 +5,7 @@ import pytest
 from pycharm._jb_unittest_runner import build_unittest_args
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_path_doesnt_exist():
     pattern = r"No such file or directory: 'test_foo.py'"
     with pytest.raises(OSError, match=pattern):
@@ -12,6 +13,7 @@ def test_path_doesnt_exist():
 
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_targets():
     assert build_unittest_args(
         path=None,
@@ -26,6 +28,7 @@ def test_targets():
     ]
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_quiet_discover(tmp_path):
     assert build_unittest_args(
         path=str(tmp_path),
@@ -44,6 +47,7 @@ def test_quiet_discover(tmp_path):
     ]
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_verbose_discover(tmp_path):
     assert build_unittest_args(
         path=str(tmp_path),
@@ -70,7 +74,6 @@ def test_python2(tmp_path):
         additional_args=[],
         verbose=True,
         project_dir="/project_dir",
-        python_version=(2, 7),
     ) == [
         "python -m unittest",
         "discover",
@@ -93,7 +96,6 @@ def test_python2_and_path_is_file(tmp_path):
         additional_args=[],
         verbose=True,
         project_dir="/project_dir",
-        python_version=(2, 7),
     ) == [
         "python -m unittest",
         "discover",
@@ -125,6 +127,7 @@ def test_python3_and_path_is_file(tmp_path):
     ]
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_user_args():
     assert build_unittest_args(
         path=None,
@@ -141,6 +144,7 @@ def test_user_args():
     ]
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_user_overrides_verbosity():
     assert build_unittest_args(
         path=None,
@@ -156,6 +160,7 @@ def test_user_overrides_verbosity():
     ]
 
 
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_rerun_failed_tests():
     assert build_unittest_args(
         path=None,

python/helpersTests/tests/pycharm/test_teamcity.py

@@ -1,9 +1,12 @@
+import sys
+
 import pytest
 
 pytest_plugins = "pytester"
 
 
 # PY-84850
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_teamcity_plugin_with_xdist(pytester):
     pytester.makepyfile("""
         def test_example_1():
@@ -25,6 +28,7 @@ def test_teamcity_plugin_with_xdist(pytester):
 
 
 # PY-84850
+@pytest.mark.skipif(sys.version_info < (3, 0), reason="Python 3 is required")
 def test_teamcity_plugin_without_xdist(pytester):
     pytester.makepyfile("""
         def test_basic():