diff --git a/Makefile b/Makefile
index db62364..3aa17b7 100644
--- a/Makefile
+++ b/Makefile
@@ -59,9 +59,10 @@ test tests: clean | $(VENV)/bin/pytest # $(VENV)/bin/nosetests	# @$(VENV)/bin/no
 
 # run main command-line tool
 run: | $(MAIN_CLI_PATH)
-	$(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.core  --cover-module=sure tests/runner/
-	$(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.core tests/
-	$(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.core --immediate
+	# $(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.core tests/
+	# $(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.core --immediate
+	# $(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.core  --cover-module=sure tests/runner/
+	$(MAIN_CLI_PATH) --with-coverage --cover-branches --cover-module=sure.runtime tests/unit/
 
 # Pushes release of this package to pypi
 push-release: dist  # pushes distribution tarballs of the current version
diff --git a/docs/source/api-reference.rst b/docs/source/api-reference.rst
index 5973f6e..8f91bdc 100644
--- a/docs/source/api-reference.rst
+++ b/docs/source/api-reference.rst
@@ -62,16 +62,16 @@ API Reference
 
 .. autoclass:: sure.runner.Runner
 
-``sure.importer``
+``sure.loader``
 -----------------
 
-.. py:module:: sure.importer
+.. py:module:: sure.loader
 
-.. autofunction:: sure.importer.resolve_path
+.. autofunction:: sure.loader.resolve_path
 
-.. autofunction:: sure.importer.get_root_python_module
+.. autofunction:: sure.loader.get_root_python_module
 
-.. autoclass:: sure.importer.importer
+.. autoclass:: sure.loader.loader
 
 
 ``sure.reporter``
diff --git a/sure/cli.py b/sure/cli.py
index c350fdd..a758c88 100644
--- a/sure/cli.py
+++ b/sure/cli.py
@@ -29,10 +29,10 @@
 
 import sure.reporters
 
-from sure.importer import resolve_path
+from sure.loader import resolve_path
 from sure.runner import Runner
 from sure.reporters import gather_reporter_names
-from sure.errors import ExitError, ExitFailure
+from sure.errors import ExitError, ExitFailure, InternalRuntimeError
 
 
 @click.command(no_args_is_help=True)
@@ -65,7 +65,10 @@ def entrypoint(paths, reporter, immediate, log_level, log_file, with_coverage, c
         cov.start()
 
     runner = Runner(resolve_path(os.getcwd()), reporter)
-    result = runner.run(paths, immediate=immediate)
+    try:
+        result = runner.run(paths, immediate=immediate)
+    except Exception as e:
+        raise InternalRuntimeError(runner.context, e)
 
     if result:
         if cov:
diff --git a/sure/errors.py b/sure/errors.py
index ed00d9a..b4af279 100644
--- a/sure/errors.py
+++ b/sure/errors.py
@@ -14,8 +14,9 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
-from __future__ import unicode_literals
+
 import sys
+import traceback
 from functools import reduce
 
 
@@ -69,3 +70,12 @@ class ExitFailure(ImmediateExit):
     def __init__(self, context, result):
         context.reporter.on_failure(result, result.first_nonsuccessful_result)
         return super().__init__(exit_code('FAILURE'))
+
+
+class InternalRuntimeError(Exception):
+    def __init__(self, context, exception: Exception):
+        self.traceback = traceback.format_exc()
+        self.exception = exception
+        self.code = exit_code(self.traceback)
+        super().__init__(self.traceback)
+        context.reporter.on_internal_runtime_error(context, self)
diff --git a/sure/importer.py b/sure/loader.py
similarity index 60%
rename from sure/importer.py
rename to sure/loader.py
index 35a9183..eddba0e 100644
--- a/sure/importer.py
+++ b/sure/loader.py
@@ -14,67 +14,68 @@ def resolve_path(path, relative_to="~") -> Path:
     return Path(path).absolute().relative_to(Path(relative_to).expanduser())
 
 
-def get_root_python_module(path) -> Path:
+def get_package(path) -> Path:
     if not isinstance(path, Path):
         path = Path(path)
 
     if not path.is_dir():
         path = path.parent
 
+    stack = []
     counter = 0
     found = None
     while not found:
         counter += 1
         if not path.parent.joinpath('__init__.py').exists():
             found = path
+            stack.append(found.parent.name)
         path = path.parent
 
-    return found
+    return found, ".".join(reversed(stack))
 
 
-class importer(object):
+class loader(object):
     @classmethod
     def load_recursive(cls, path, ignore_errors=True, glob_pattern='*.py'):
         modules = []
         path = Path(path)
         if path.is_file():
-            return cls.load_python_file(path)
+            return cls.load_python_path(path)
 
         base_path = Path(path).expanduser().absolute()
         targets = list(base_path.glob(glob_pattern))
-        for file in targets:
-            modules.extend(cls.load_python_file(file))
+        for path in targets:
+            modules.extend(cls.load_python_path(path))
 
         return modules
 
     @classmethod
-    def load_python_file(cls, file):
-        if file.is_dir():
-            logger.debug(f'ignoring directory {file}')
+    def load_python_path(cls, path):
+        if path.is_dir():
+            logger.debug(f'ignoring directory {path}')
             return []
 
-        if file.name.startswith('_') or file.name.endswith('_'):
+        if path.name.startswith('_') or path.name.endswith('_'):
             return []
 
-        module, root = cls.dig_to_root(file)
-        __ROOTS__[str(root)] = root
+        module, root = cls.traverse_to_package(path)
         return [module]
 
     @classmethod
-    def dig_to_root(cls, file):
-        root = get_root_python_module(file)
-        module_is_artificial = file.parent.joinpath('__init__.py').exists()
-        module_name = file.parent.name
+    def traverse_to_package(cls, path):
+        package, fqdn = get_package(path)
+        module_is_artificial = path.parent.joinpath('__init__.py').exists()
+        module_name = path.parent.name
         if not module_is_artificial:
-            relative = str(file.relative_to(root.parent))
+            relative = str(path.relative_to(root.parent))
             module_name = os.path.splitext(relative)[0].replace(os.sep, '.')
 
-        spec = importlib.util.spec_from_file_location(module_name, file)
+        spec = importlib.util.spec_from_file_location(module_name, path)
         module = importlib.util.module_from_spec(spec)
-        __MODULES__[module_name] = module
-        sys.modules[module_name] = module
+        __MODULES__[fqdn] = module
+        sys.modules[fqdn] = module
         try:
             spec.loader.exec_module(module)
         except Exception as e:
             raise e
-        return module, root.absolute()
+        return module, package.absolute()
diff --git a/sure/meta.py b/sure/meta.py
index b965174..d60d4c8 100644
--- a/sure/meta.py
+++ b/sure/meta.py
@@ -19,7 +19,7 @@
 from typing import List
 from pathlib import Path
 
-from sure.importer import importer
+from sure.loader import loader
 
 module_root = Path(__file__).parent.absolute()
 
@@ -48,7 +48,7 @@ def internal_module_name(name):
 
 def register_class(cls, identifier):
     cls.kind = identifier
-    cls.importer = importer
+    cls.loader = loader
     if len(cls.__mro__) > 2:
         register = MODULE_REGISTERS[identifier]
         return register(cls)
diff --git a/sure/reporter.py b/sure/reporter.py
index c545e22..9e2b238 100644
--- a/sure/reporter.py
+++ b/sure/reporter.py
@@ -174,10 +174,25 @@ class SuccessReporter(Reporter):
                def on_success(self, scenario):
                    sys.stderr.write('Reporter.on_success reported {}'.format(scenario.name))
 
-           class success:
-               name = 'a simple success'
+           class FakeScenario:
+               pass
 
-           SuccessReporter('a <sure.runner.Runner()>').on_success(success)
+           SuccessReporter('a <sure.runner.Runner()>').on_success(FakeScenario)
+        """
+        raise NotImplementedError
+
+    def on_internal_runtime_error(self, context, exception: Exception):
+        """Called when :py:class:`sure.FeatureReporter`
+
+        .. code:: python
+
+           from sure.reporter import Reporter
+
+           class ErrorReporter(Reporter):
+               def on_internal_runtime_error(self, scenario):
+                   sys.stderr.write('Reporter.on_success reported {}'.format(scenario.name))
+
+           ErrorReporter('a <sure.runner.Runner()>').on_internal_runtime_error(context, error)
         """
         raise NotImplementedError
 
@@ -261,7 +276,7 @@ def from_name_and_runner(cls, name, runner):
 
            reporter = Reporter.from_name_and_runner('feature', runner)
         """
-        cls.importer.load_recursive(
+        cls.loader.load_recursive(
             __path__.joinpath("reporters"),
             ignore_errors=False,
         )
diff --git a/sure/reporters/feature.py b/sure/reporters/feature.py
index 4ec4b3e..658386f 100644
--- a/sure/reporters/feature.py
+++ b/sure/reporters/feature.py
@@ -15,6 +15,7 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 from couleur import Shell
 
 from sure.errors import ImmediateFailure
@@ -64,7 +65,7 @@ def on_failure(self, test, result):
         sh.reset("\n")
         sh.reset(" " * self.indentation)
         self.indentation += 2
-        sh.yellow(f"Failure: {result.succinct_failure}")
+        sh.bold_yellow(f"Failure:\n{result.succinct_failure}")
         sh.reset(" " * self.indentation)
         sh.bold_yellow(f"\n{' ' * self.indentation} Scenario:")
         sh.bold_yellow(f"\n{' ' * self.indentation}     {result.location.description}")
@@ -84,10 +85,16 @@ def on_error(self, test, error):
         sh.red(ballot)
         sh.reset("\n")
         sh.reset(" " * self.indentation)
-        sh.red(" ".join(error.args))
+        sh.bold_red(" ".join(error.args))
         sh.reset("\n")
         self.indentation -= 2
 
+    def on_internal_runtime_error(self, context, error):
+        sh = Shell()
+        sh.bold_yellow("Internal Runtime Error\n")
+        sh.bold_red(error.traceback)
+        raise SystemExit(error.code)
+
     def on_finish(self):
         failed = len(self.failures)
         errors = len(self.errors)
diff --git a/sure/runner.py b/sure/runner.py
index aef47dd..4ac0ae9 100644
--- a/sure/runner.py
+++ b/sure/runner.py
@@ -41,7 +41,7 @@
     stripped,
     seem_to_indicate_test,
 )
-from sure.importer import importer
+from sure.loader import loader
 from sure.reporter import Reporter
 
 
@@ -64,7 +64,7 @@ def get_reporter(self, name):
     def find_candidates(self, lookup_paths):
         candidate_modules = []
         for path in lookup_paths:
-            modules = importer.load_recursive(path, glob_pattern="test*.py")
+            modules = loader.load_recursive(path, glob_pattern="test*.py")
             candidate_modules.extend(modules)
 
         return candidate_modules
diff --git a/sure/runtime.py b/sure/runtime.py
index 0a2d2cf..384c022 100644
--- a/sure/runtime.py
+++ b/sure/runtime.py
@@ -35,7 +35,7 @@
     ImmediateError,
     ImmediateFailure,
 )
-from sure.importer import importer
+from sure.loader import loader
 from sure.reporter import Reporter
 
 self = sys.modules[__name__]
@@ -89,6 +89,31 @@ def appears_to_be_runnable(name: str) -> bool:
     )
 
 
+class CallGuard(object):
+    def __init__(self, source, ancestor=None):
+        self.source = source
+        self.ancestor = ancestor
+        self.function = isinstance(source, types.FunctionType)
+        self.callable = callable(source)
+
+    @property
+    def name(self):
+        if self.is_function:
+            return self.source.__name__
+        return self.test.__func__.__name__
+
+    def __call__(self, *args, **kw):
+        if isinstance(source, type):
+            self.source_instance = source()
+        elif callable(source):
+            test_methods.insert(0, Container(source.__name__, source, TestLocation(
+                source, source.__module__
+            ), some_object))
+            self.source_instance = source.__module__
+        else:
+            raise NotImplementedError(f"PreparedTestSuiteContainer received unexpected type: {source}")
+
+
 class TestLocation(object):
     def __init__(self, test, ancestor=None):
         self.test = test
@@ -96,19 +121,26 @@ def __init__(self, test, ancestor=None):
         self.filename = self.code.co_filename
         self.line = self.code.co_firstlineno
         self.kind = self.test.__class__
-        self.name = self.test.__func__.__name__
+        self.name = isinstance(self.test, types.FunctionType) and self.test.__name__ or self.test.__func__.__name__
         self.ancestor = ancestor
         self.ancestral_description = ""
         self.ancestor_repr = ""
         if ancestor:
             self.ancestral_description = getattr(
                 ancestor, "description", ""
-            ) or getattr(ancestor, "__doc__", "")
-            self.ancestor_repr = (
-                f"({self.ancestor.__module__}.{self.ancestor.__name__})"
+            ) or getattr(
+                ancestor, "__doc__", ""
             )
+            if isinstance(ancestor, type):
+                self.ancestor_repr = (
+                    f"({self.ancestor.__module__}.{self.ancestor.__name__})"
+                )
+            elif isinstance(ancestor, str):
+                self.ancestor_repr = ancestor
+            else:
+                raise NotImplementedError
 
-        self.description = self.test.__func__.__doc__ or ""
+        self.description = getattr(self.test, '__func__', self.test).__doc__ or ""
 
     def __repr__(self):
         return " ".join([self.name, "at", self.ort])
@@ -256,7 +288,18 @@ def __init__(
         test_methods: List[Callable],
         nested_suites: List[PreparedTestSuiteContainer],
     ):
-        self.source_instance = source()
+        self.error = None
+        self.failure = None
+        if isinstance(source, type):
+            self.source_instance = source()
+        elif callable(source):
+            test_methods.insert(0, Container(source.__name__, source, TestLocation(
+                source, source.__module__
+            ), source.__module__))
+            self.source_instance = source.__module__
+        else:
+            raise NotImplementedError(f"PreparedTestSuiteContainer received unexpected type: {source}")
+
         self.log = Logort(self.source_instance)
         self.context = context
         self.setup_methods = setup_methods
@@ -291,10 +334,10 @@ def from_generic_object(cls, some_object, context: RuntimeContext):
             if isinstance(some_object, type) and issubclass(
                 some_object, unittest.TestCase
             ):
-                # XXX: warn about probability of abuse of TestCase constructor taking wrong arguments
+                # TODO: warn about probability of abuse of TestCase constructor taking wrong arguments
                 runnable = getattr(some_object(name), name, None)
             else:
-                # XXX: support non-unittest.TestCase classes
+                # TODO: support non-unittest.TestCase classes
                 runnable = getattr(some_object, name, None)
             # </unittest.TestCase.__init__>
 
@@ -304,7 +347,7 @@ def from_generic_object(cls, some_object, context: RuntimeContext):
                 )
 
                 if seem_to_indicate_setup(name):
-                    # XXX: warn about probability of abuse of TestCase constructor taking non-standard arguments
+                    # TODO: warn about probability of abuse of TestCase constructor taking non-standard arguments
                     setup_methods.append(
                         Container(name, runnable, location, some_object)
                     )
@@ -392,7 +435,6 @@ def run(self, context):
                 yield result, RuntimeRole.Teardown
 
     def run_container(self, container, context):
-        # concentrated area of test execution
         return self.perform_unit(
             test=container.unit,
             context=context,
@@ -465,33 +507,21 @@ def run(self, reporter, runtime: RuntimeOptions):
 
 
 class ErrorStack(object):
-    def __init__(self, exception_info=None):
+    def __init__(self, location: TestLocation, exc: Exception, exception_info=None):
         self.exception_info = exception_info or sys.exc_info()
         self.traceback = self.exception_info[-1]
+        self.exception = exc
+        self.location = location
 
-    def tb(self):
-        return self.traceback
-
-    def ff(self):
-        module_path = str(Path(__file__).parent.absolute())
-        tb = self.traceback
-        cutoff_index = 0
-        while True:
-            yield tb, cutoff_index
-            code_path = str(Path(tb.tb_frame.f_code.co_filename).absolute())
-            if code_path.startswith(module_path):
-                tb = tb.tb_next
-                cutoff_index += 1
-            else:
-                yield tb, cutoff_index
-                break
+    def location_specific_stack(self):
+        return [e for e in traceback.format_tb(self.traceback) if self.location.name in e]
 
-    def relevant_error_message(self):
-        stack = list(self.ff())
-        return "\n".join(traceback.format_tb(stack[-1][0]))
+    def location_specific_error(self):
+        stack = self.location_specific_stack()
+        return stack and stack[-1] or str(self.exception)
 
-    def printable(self):
-        return "\n".join(self.tb())
+    def __str__(self):
+        return "\n".join(self.location_specific_stack())
 
 
 class Scenario(object):
@@ -538,7 +568,7 @@ def __init__(
         self.location = location
         self.context = context
         self.exc_info = sys.exc_info()
-        self.stack = ErrorStack(self.exc_info)
+        self.stack = ErrorStack(location, error, self.exc_info)
         self.__error__ = None
         self.__failure__ = None
 
@@ -610,10 +640,7 @@ def succinct_failure(self) -> str:
         if not self.is_failure:
             return ""
 
-        assertion = self.failure.args[0]
-        assertion = assertion.replace(self.location.name, "")
-        assertion = assertion.replace(self.location.ancestor_repr, "")
-        return assertion.strip()
+        return self.stack.location_specific_error()
 
 
 class ScenarioResultSet(ScenarioResult):
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_object_name.py b/tests/unit/test_object_name.py
new file mode 100644
index 0000000..a212b33
--- /dev/null
+++ b/tests/unit/test_object_name.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# <sure - utility belt for automated testing in python>
+# Copyright (C) <2010-2023>  Gabriel Falcão <gabriel@nacaolivre.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"sure.runtime"
+
+from collections.abc import Awaitable
+from sure.runtime import object_name
+
+
+def test_object_name_type():
+    "calling ``sure.runtime.object_name(X)`` where X is a ``type``"
+    assert object_name(Awaitable) == "collections.abc.Awaitable"
diff --git a/tests/unit/test_runtime.py b/tests/unit/test_runtime.py
new file mode 100644
index 0000000..cd1aadf
--- /dev/null
+++ b/tests/unit/test_runtime.py
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# <sure - utility belt for automated testing in python>
+# Copyright (C) <2010-2023>  Gabriel Falcão <gabriel@nacaolivre.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"sure.runtime"
+
+from collections.abc import Awaitable
+from sure.runtime import object_name
+
+
+def test_object_name_type():
+    "calling ``sure.runtime.object_name(X)`` where X is a ``type``"
+    object_name(Awaitable).should_not.equal("collections.abc.Awaitablea")
+    object_name(Awaitable).should.equal("collections.abc.Awaitable")