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test_base_model.py
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test_base_model.py
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#!/usr/bin/python3
"""Test BaseModel for expected behavior and documentation"""
from datetime import datetime
import inspect
import models
import pep8 as pycodestyle
import time
import unittest
from unittest import mock
BaseModel = models.base_model.BaseModel
module_doc = models.base_model.__doc__
class TestBaseModelDocs(unittest.TestCase):
"""Tests to check the documentation and style of BaseModel class"""
@classmethod
def setUpClass(self):
"""Set up for docstring tests"""
self.base_funcs = inspect.getmembers(BaseModel, inspect.isfunction)
def test_pep8_conformance(self):
"""Test that models/base_model.py conforms to PEP8."""
for path in ['models/base_model.py',
'tests/test_models/test_base_model.py']:
with self.subTest(path=path):
errors = pycodestyle.Checker(path).check_all()
self.assertEqual(errors, 0)
def test_module_docstring(self):
"""Test for the existence of module docstring"""
self.assertIsNot(module_doc, None,
"base_model.py needs a docstring")
self.assertTrue(len(module_doc) > 1,
"base_model.py needs a docstring")
def test_class_docstring(self):
"""Test for the BaseModel class docstring"""
self.assertIsNot(BaseModel.__doc__, None,
"BaseModel class needs a docstring")
self.assertTrue(len(BaseModel.__doc__) >= 1,
"BaseModel class needs a docstring")
def test_func_docstrings(self):
"""Test for the presence of docstrings in BaseModel methods"""
for func in self.base_funcs:
with self.subTest(function=func):
self.assertIsNot(
func[1].__doc__,
None,
"{:s} method needs a docstring".format(func[0])
)
self.assertTrue(
len(func[1].__doc__) > 1,
"{:s} method needs a docstring".format(func[0])
)
class TestBaseModel(unittest.TestCase):
"""Test the BaseModel class"""
def test_instantiation(self):
"""Test that object is correctly created"""
inst = BaseModel()
self.assertIs(type(inst), BaseModel)
inst.name = "Holberton"
inst.number = 89
attrs_types = {
"id": str,
"created_at": datetime,
"updated_at": datetime,
"name": str,
"number": int
}
for attr, typ in attrs_types.items():
with self.subTest(attr=attr, typ=typ):
self.assertIn(attr, inst.__dict__)
self.assertIs(type(inst.__dict__[attr]), typ)
self.assertEqual(inst.name, "Holberton")
self.assertEqual(inst.number, 89)
def test_datetime_attributes(self):
"""Test that two BaseModel instances have different datetime objects
and that upon creation have identical updated_at and created_at
value."""
tic = datetime.utcnow()
inst1 = BaseModel()
toc = datetime.utcnow()
self.assertTrue(tic <= inst1.created_at <= toc)
time.sleep(1e-4)
tic = datetime.utcnow()
inst2 = BaseModel()
toc = datetime.utcnow()
self.assertTrue(tic <= inst2.created_at <= toc)
self.assertEqual(inst1.created_at, inst1.updated_at)
self.assertEqual(inst2.created_at, inst2.updated_at)
self.assertNotEqual(inst1.created_at, inst2.created_at)
self.assertNotEqual(inst1.updated_at, inst2.updated_at)
def test_uuid(self):
"""Test that id is a valid uuid"""
inst1 = BaseModel()
inst2 = BaseModel()
for inst in [inst1, inst2]:
uuid = inst.id
with self.subTest(uuid=uuid):
self.assertIs(type(uuid), str)
self.assertRegex(uuid,
'^[0-9a-f]{8}-[0-9a-f]{4}'
'-[0-9a-f]{4}-[0-9a-f]{4}'
'-[0-9a-f]{12}$')
self.assertNotEqual(inst1.id, inst2.id)
def test_to_dict(self):
"""Test conversion of object attributes to dictionary for json"""
my_model = BaseModel()
my_model.name = "Holberton"
my_model.my_number = 89
d = my_model.to_dict()
expected_attrs = ["id",
"created_at",
"updated_at",
"name",
"my_number",
"__class__"]
self.assertCountEqual(d.keys(), expected_attrs)
self.assertEqual(d['__class__'], 'BaseModel')
self.assertEqual(d['name'], "Holberton")
self.assertEqual(d['my_number'], 89)
def test_to_dict_values(self):
"""test that values in dict returned from to_dict are correct"""
t_format = "%Y-%m-%dT%H:%M:%S.%f"
bm = BaseModel()
new_d = bm.to_dict()
self.assertEqual(new_d["__class__"], "BaseModel")
self.assertEqual(type(new_d["created_at"]), str)
self.assertEqual(type(new_d["updated_at"]), str)
self.assertEqual(new_d["created_at"], bm.created_at.strftime(t_format))
self.assertEqual(new_d["updated_at"], bm.updated_at.strftime(t_format))
def test_str(self):
"""test that the str method has the correct output"""
inst = BaseModel()
string = "[BaseModel] ({}) {}".format(inst.id, inst.__dict__)
self.assertEqual(string, str(inst))
@mock.patch('models.storage')
def test_save(self, mock_storage):
"""Test that save method updates `updated_at` and calls
`storage.save`"""
inst = BaseModel()
old_created_at = inst.created_at
old_updated_at = inst.updated_at
inst.save()
new_created_at = inst.created_at
new_updated_at = inst.updated_at
self.assertNotEqual(old_updated_at, new_updated_at)
self.assertEqual(old_created_at, new_created_at)
self.assertTrue(mock_storage.new.called)
self.assertTrue(mock_storage.save.called)