def test_remove_model_method(self):
"""Testing the remove_model() method."""
# arrange
# instantiating the model manager class
model_manager = ModelManager()
# adding the model
model_manager.load_model("tests.mocks.MLModelMock")
# act
exception_raised1 = False
# accessing the MLModelMock model object
try:
model_manager.remove_model(qualified_name="qualified_name")
except Exception as e:
exception_raised1 = True
exception_raised2 = False
exception_message2 = ""
# trying to access the model that was removed
try:
model = model_manager.get_model(qualified_name="qualified_name")
except Exception as e:
exception_raised2 = True
exception_message2 = str(e)
# assert
self.assertFalse(exception_raised1)
self.assertTrue(exception_raised2)
self.assertTrue(
exception_message2 ==
"Instance of model 'qualified_name' not found in ModelManager.")
def test_load_model_method(self):
# arrange
# instantiating the model manager class
model_manager = ModelManager()
# adding the model
model_manager.load_model("tests.mocks.MLModelMock")
# act
exception_raised = False
model_object = None
# accessing the MLModelMock model object
try:
model_object = model_manager.get_model(
qualified_name="qualified_name")
except Exception as e:
exception_raised = True
print_tb(e)
# assert
self.assertFalse(exception_raised)
self.assertTrue(model_object is not None)
# cleanup
model_manager.clear_instance()
def test_model_manager_will_not_execute_init_twice(self):
# arrange
# instantiating the model manager class twice
first_model_manager = ModelManager()
first_model_manager.load_model("tests.mocks.MLModelMock")
# act
second_model_manager = ModelManager()
# assert
self.assertTrue(first_model_manager._models != [])
# cleanup
first_model_manager.clear_instance()
def test_get_models_method(self):
"""Testing get_models method."""
# arrange
model_manager = ModelManager()
model_manager.load_model("tests.mocks.MLModelMock")
# act
models = model_manager.get_models()
# assert
self.assertTrue(models[0]["display_name"] == "display_name")
self.assertTrue(models[0]["qualified_name"] == "qualified_name")
self.assertTrue(models[0]["description"] == "description")
self.assertTrue(models[0]["version"] == "1.0.0")
def test_get_model_method(self):
"""Testing the get_model method."""
# arrange
model_manager = ModelManager()
model_manager.load_model("tests.mocks.MLModelMock")
# act
exception_raised = False
model = None
try:
model = model_manager.get_model(qualified_name="qualified_name")
except Exception as e:
exception_raised = True
# assert
self.assertFalse(exception_raised)
self.assertTrue(type(model) is MLModelMock)
def test_get_model_metadata_method(self):
"""Testing get_model_metadata method."""
# arrange
model_manager = ModelManager()
model_manager.load_model("tests.mocks.MLModelMock")
# act
model_metadata = model_manager.get_model_metadata(
qualified_name="qualified_name")
# assert
self.assertTrue(model_metadata["display_name"] == "display_name")
self.assertTrue(model_metadata["qualified_name"] == "qualified_name")
self.assertTrue(model_metadata["description"] == "description")
self.assertTrue(model_metadata["version"] == "1.0.0")
self.assertTrue(type(model_metadata["input_schema"]) is dict)
self.assertTrue(type(model_metadata["output_schema"]) is dict)
def test_model_manager_will_return_same_instance_when_instantiated_many_times(
self):
"""Testing that the ModelManager will return the same instance of an MLModel class from several different
references of ModelManager."""
# arrange, act
# instantiating the model manager class twice
first_model_manager = ModelManager()
second_model_manager = ModelManager()
# loading the MLModel objects from configuration
first_model_manager.load_model("tests.mocks.MLModelMock")
first_model_object = first_model_manager.get_model(
qualified_name="qualified_name")
second_model_object = second_model_manager.get_model(
qualified_name="qualified_name")
# assert
self.assertTrue(str(first_model_manager) == str(second_model_manager))
self.assertTrue(str(first_model_object) == str(second_model_object))
def test_only_ml_model_instances_allowed_to_be_stored(self):
"""Testing that the ModelManager only allows MLModel objects to be stored."""
# arrange
model_manager = ModelManager()
# act
exception_raised = False
exception_message = ""
try:
model_manager.load_model("tests.mocks.SomeClass")
except Exception as e:
exception_raised = True
exception_message = str(e)
# assert
self.assertTrue(exception_raised)
self.assertTrue(
exception_message ==
"ModelManager instance can only hold references to objects of type MLModel."
)
def test_load_model_method_with_wrong_class_path(self):
"""Testing the load_model() method."""
# arrange
# instantiating the model manager class
model_manager = ModelManager()
# act
# adding the model
exception_raised = False
exception_message = None
# accessing the MLModelMock model object
try:
model_manager.load_model("sdf.sdf.sdf")
except Exception as e:
exception_raised = True
exception_message = str(e)
# assert
self.assertTrue(exception_raised)
self.assertTrue(exception_message == "No module named 'sdf'")
def test_remove_model_method_with_missing_model(self):
"""Testing that the ModelManager raises ValueError exception when removing a model that is not found."""
# arrange
model_manager = ModelManager()
model_manager.load_model("tests.mocks.MLModelMock")
# act
exception_raised = False
exception_message = ""
try:
model_manager.remove_model(qualified_name="asdf")
except Exception as e:
exception_raised = True
exception_message = str(e)
# assert
self.assertTrue(exception_raised)
self.assertTrue(exception_message ==
"Instance of model 'asdf' not found in ModelManager.")
def test_get_model_metadata_method_with_missing_model(self):
"""Testing get_model_metadata method with missing model."""
# arrange
model_manager = ModelManager()
model_manager.load_model("tests.mocks.MLModelMock")
# act
excpeption_raised = False
exception_message = None
try:
model_metadata = model_manager.get_model_metadata(
qualified_name="asdf")
except Exception as e:
excpeption_raised = True
exception_message = str(e)
# assert
self.assertTrue(excpeption_raised)
self.assertTrue(exception_message ==
"Instance of model 'asdf' not found in ModelManager.")
def test_model_manager_will_return_same_instance_when_instantiated_many_times(
self):
# arrange, act
# instantiating the model manager class twice
first_model_manager = ModelManager()
second_model_manager = ModelManager()
# loading the MLModel objects from configuration
first_model_manager.load_model("tests.mocks.MLModelMock")
first_model_object = first_model_manager.get_model(
qualified_name="qualified_name")
second_model_object = second_model_manager.get_model(
qualified_name="qualified_name")
# assert
self.assertTrue(str(first_model_manager) == str(second_model_manager))
self.assertTrue(str(first_model_object) == str(second_model_object))
# cleanup
first_model_manager.clear_instance()
def test_model_manager_does_not_allow_duplicate_qualified_names(self):
"""Testing that the ModelManager does not allow duplicate qualified names in the singleton."""
# arrange
model_manager = ModelManager()
# act
# loading the first instance of the model object
model_manager.load_model("tests.mocks.MLModelMock")
exception_raised = False
exception_message = ""
try:
# loading it again
model_manager.load_model("tests.mocks.MLModelMock")
except Exception as e:
exception_raised = True
exception_message = str(e)
# assert
self.assertTrue(exception_raised)
self.assertTrue(
exception_message ==
"A model with the same qualified name is already in the ModelManager singleton."
)