[#5] Remove testlib config file support

In order to make library as flexible as possible we will try to use
configuration methods similar to function `logging.dictConfig` from the
standard library. So, we won't support configuration file
`.neofs-testlib.yaml`, but will allow users to call `configure` method
that will load plugins and initialize library components.

Signed-off-by: Vladimir Domnich <v.domnich@yadro.com>

tests/test_reporter.py

@@ -0,0 +1,73 @@
+from contextlib import AbstractContextManager
+from types import TracebackType
+from typing import Optional
+from unittest import TestCase
+from unittest.mock import MagicMock
+
+from neofs_testlib.reporter import Reporter
+
+
+class TestLocalShellInteractive(TestCase):
+    def setUp(self):
+        self.reporter = Reporter()
+
+    def test_handler_step_is_invoked(self):
+        handler = MagicMock()
+        self.reporter.register_handler(handler)
+
+        with self.reporter.step("test_step"):
+            pass
+
+        handler.step.assert_called_once_with("test_step")
+
+    def test_two_handler_steps_are_invoked(self):
+        handler1 = MagicMock()
+        handler2 = MagicMock()
+
+        self.reporter.register_handler(handler1)
+        self.reporter.register_handler(handler2)
+
+        with self.reporter.step("test_step"):
+            pass
+
+        handler1.step.assert_called_once_with("test_step")
+        handler2.step.assert_called_once_with("test_step")
+
+    def test_handlers_can_suppress_exception(self):
+        handler1 = MagicMock()
+        handler1.step = MagicMock(return_value=StubContext(suppress_exception=True))
+        handler2 = MagicMock()
+        handler2.step = MagicMock(return_value=StubContext(suppress_exception=True))
+
+        self.reporter.register_handler(handler1)
+        self.reporter.register_handler(handler2)
+
+        with self.reporter.step("test_step"):
+            raise ValueError("Test exception")
+
+    def test_handler_can_override_exception_suppression(self):
+        handler1 = MagicMock()
+        handler1.step = MagicMock(return_value=StubContext(suppress_exception=True))
+        handler2 = MagicMock()
+        handler2.step = MagicMock(return_value=StubContext(suppress_exception=False))
+
+        self.reporter.register_handler(handler1)
+        self.reporter.register_handler(handler2)
+
+        with self.assertRaises(ValueError):
+            with self.reporter.step("test_step"):
+                raise ValueError("Test exception")
+
+
+class StubContext(AbstractContextManager):
+    def __init__(self, suppress_exception: bool) -> None:
+        super().__init__()
+        self.suppress_exception = suppress_exception
+
+    def __exit__(
+        self,
+        exc_type: Optional[type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType],
+    ) -> Optional[bool]:
+        return self.suppress_exception