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                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007
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 might be different; for a GUI interface, you would use an "about box".
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <https://www.gnu.org/licenses/>.
  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -0,0 +1,59 @@
 # FSHTBKVS
 The FSHTBKVS (Filesystem Hash Table Based Key Value Store) was developed
 to be an easy to deploy key value store with fast lookup times even for (very)
 large data sets and without third party dependencies.
 ## Usage
 ### Basic
 ```python
 from FSHTBKVS import FSHTBKVS
 # create/open a kvs
 kvs = FSHTBKVS(
  '/home/fshtbkvs/data',                                  # path where the kvs will be created/is located
  'Test_KVS'                                              # name of the kvs
 )
 kvs.write('this could be a key', 'this could be a value') # adds/updates a value
 kvs.read('this could be a key')                           # returns the value for a given key
 kvs.delete('this could be a key')                         # deletes a value
 ```
 ### Advanced
 ```python
 kvs.export_kvs(file='/tmp/kvs_export.fshtbkvs')           # exports the whole kvs into a .fshtbkvs file
 kvs.import_kvs(file='/tmp/kvs_export.fshtbkvs')           # imports a .fshtbkvs file
 kvs.wipe_kvs()                                            # deletes all entries
 ```
 ### Miscellaneous
 ```python
 kvs.get_entries()                                         # returns the number of entries
 kvs.get_kvs_name()                                        # returns the name of the kvs
 kvs.get_max_depth()                                       # returns the depth of the kvs
 kvs.get_size_of_kvs()                                     # returns the size of the kvs in megabytes (as float)
 kvs.maintain_kvs()                                        # recreates missing/broken .json files and counts all entries
 ```
 ## Information
 When creating a KVS, the optional parameter 'max_depth' can be used.
 It specifies how many levels of the hash table will be created.
 The default value is 4, which results in 65,536 .json files. This seems to be
 a sweet spot for most (hobby) projects. If you expect a very large amount of data,
 the value should rather be set higher to keep the access times low. Naturally,
 the higher the selected value, the more difficult it is to handle the KVS
 (with regard to the file system).
 | max_depth    | # of .json files created |
 |--------------|-------------------------:|
 | 1            | 16                       |
 | 2            | 256                      |
 | 3            | 4,096                    |
 | **4**        | **65,536**               |
 | 5            | 1,048,576                |
 | 6            | 16,777,216               |
 | 7            | 268,435,456              |
--- a/fshtbkvs/FSHTBKVS.py
+++ b/fshtbkvs/FSHTBKVS.py
@ -0,0 +1,519 @@
 import hashlib
 import json
 import os
 from pathlib import Path
 class FSHTBKVS:
 	"""
 	Filesystem Hash Table Based Key Value Store (FSHTBKVS)
 	The FSHTBKVS was developed to be an easy to deploy
 	key value store with fast lookup times for (very)
 	large data sets and without third party dependencies.
 	max_depth and the amount of files created:
 	1: 16^1 = 16
 	2: 16^2 = 256
 	3: 16^3 = 4.096
 	4: 16^4 = 65.536
 	5: 16^5 = 1.048.576
 	6: 16^6 = 16.777.216
 	7: 16^7 = 268.435.456
 	"""
 	def __init__(self, root_dir, kvs_name, max_depth=4):
 		self.__root_dir  = os.path.normpath(root_dir)
 		if not os.path.exists(root_dir):
 			raise ValueError("root_dir '" + root_dir + "' does not exist")
 		self.__kvs_name   = kvs_name
 		self.__root_dir   = os.path.join(self.__root_dir, self.__kvs_name)
 		self.__meta_file  = os.path.join(self.__root_dir, 'meta.json')
 		self.__max_depth  = max_depth if max_depth in range(1, 7) else 4
 		self.__entries    = 0
 		self.__all_file_paths   = []
 		self.__all_folder_paths = []
 		if not os.path.exists(self.__root_dir):
 			os.makedirs(self.__root_dir)
 			self.__create_meta_file()
 			self.__build_all_paths()
 		if self.__load_meta_file() is False:
 			raise OSError(
 				"Not able to load or restore the meta file: "
 				+ str(self.__meta_file)
 			)
 	def delete(self, key):
 		"""
 		Deletes an entry with the key 'key' from the kvs
 		"""
 		self.__validate_key(key)
 		key  = self.__process_key(key)
 		file = self.__get_file_by_key(key)
 		data = self.__load_dict_from_json_file(file)
 		if not key in data:
 			return 1
 		del data[key]
 		data_written 	= self.__save_dict_to_json_file(file, data)
 		if not data_written:
 			return -1
 		self.__entries -= 1
 		self.__create_meta_file()
 		return 1
 	def export_kvs(self, file=''):
 		"""
 		Exports whole kvs data as importable .fshtbkvs file
 		"""
 		if file == '':
 			file = os.path.join(
 				os.path.dirname(self.__root_dir),
 				self.__kvs_name + '.fshtbkvs'
 			)
 		# build all file paths
 		if self.__all_file_paths == []:
 			self.__build_all_file_paths()
 		# write all key value pairs to export file
 		try:
 			with open(file, 'w') as f_export:
 				for f in self.__all_file_paths:
 					data = self.__load_dict_from_json_file(f)
 					for key, value in data.items():
 						f_export.write(
 							json.dumps(
 								{key: value},
 								ensure_ascii=False
 							)
 							+ '\n'
 						)
 				f_export.close()
 		except:
 			raise OSError(
 				"Not able to write kvs export to file: "
 				+ str(file)
 			)
 		return 1
 	def get_entries(self):
 		return self.__entries
 	def get_kvs_name(self):
 		return self.__kvs_name
 	def get_max_depth(self):
 		return self.__max_depth
 	def get_size_of_kvs(self):
 		"""
 		Returns the size of all json files used for storing data in megabytes
 		"""
 		kvs_size_in_megabytes = 0.0
 		if self.__all_file_paths == []:
 			self.__build_all_file_paths()
 		for f in self.__all_file_paths:
 			if not os.path.exists(f):
 				self.maintain_kvs()
 			kvs_size_in_megabytes += (
 				os.path.getsize(f) / 1000 / 1000
 			)
 		return round(kvs_size_in_megabytes, 6)
 	def import_kvs(self, file=''):
 		"""
 		Imports .fshtbkvs file into the kvs
 		"""
 		if file == '':
 			raise ValueError("file must not be empty")
 		if not os.path.exists(file):
 			raise ValueError("file does not exist")
 		# get all key value pairs line by line and add it to the kvs
 		with open(file, 'r') as f:
 			while True:
 				line = f.readline()
 				if not line:
 					break
 				if line.strip() == '':
 					continue
 				try:
 					for key, value in json.loads(line.strip()).items():
 						self.write(key, value)
 				except:
 					continue
 		return 1
 	def maintain_kvs(self):
 		"""
 		Rebuilds broken .json files and, creates missing files and folders
 		and creates an updated meta file
 		"""
 		# build all paths
 		self.__build_all_paths()
 		# cleanup all json files
 		self.__entries = 0
 		for f in self.__all_file_paths:
 			data 		= self.__load_dict_from_json_file(f)
 			data_clean 	= {}
 			for key, value in data.items():
 				try:
 					self.__validate_key(key)
 					self.__validate_value(value)
 					data_clean[key] = value
 				except:
 					continue
 			data_written = self.__save_dict_to_json_file(f, data_clean)
 			if not data_written:
 				return -1
 			self.__entries += len(data_clean)
 		self.__create_meta_file()
 		return 1
 	def read(self, key):
 		"""
 		Returns the entry with the key 'key' from the kvs or 'None', if no entry
 		exists
 		"""
 		self.__validate_key(key)
 		key  = self.__process_key(key)
 		file = self.__get_file_by_key(key)
 		data = self.__load_dict_from_json_file(file)
 		if not key in data:
 			return None
 		value = data[key]
 		self.__validate_value(value)
 		return value
 	def wipe_kvs(self):
 		"""
 		Deletes every entry from the kvs and creates an updated meta file
 		"""
 		# delete meta file for auto maintainance, if wiping fails
 		os.remove(self.__meta_file)
 		# make sure, all files and folders exist
 		self.__build_all_paths()
 		# wipe all json files
 		for f in self.__all_file_paths:
 			self.__save_dict_to_json_file(f, {})
 		self.__entries = 0
 		return self.__create_meta_file()
 	def write(self, key, value):
 		"""
 		Adds (or updates) an entry with the key 'key' and the value 'value'
 		"""
 		self.__validate_key(key)
 		self.__validate_value(value)
 		key  		= self.__process_key(key)
 		file 		= self.__get_file_by_key(key)
 		key_existed = False
 		data = self.__load_dict_from_json_file(file)
 		if key in data:
 			key_existed = True
 		data[key] 		= value
 		data_written 	= self.__save_dict_to_json_file(file, data)
 		if not data_written:
 			return -1
 		if not key_existed:
 			self.__entries += 1
 			self.__create_meta_file()
 		return 1
 	def __build_all_paths(self):
 		"""
 		Gathers all file/folder paths and creates those when missing
 		"""
 		# build all file paths
 		if self.__all_file_paths == []:
 			self.__build_all_file_paths()
 		# build all folder paths
 		if self.__all_folder_paths == []:
 			self.__build_all_folder_paths()
 		# create all folders
 		for f in self.__all_folder_paths:
 			os.makedirs(f, exist_ok=True)
 		# create all files
 		for f in self.__all_file_paths:
 			if not os.path.exists(f):
 				self.__save_dict_to_json_file(f, {})
 	def __build_all_file_paths(self):
 		"""
 		Calculates all json file paths
 		"""
        # build all file paths
 		def build_all_file_paths(r_root_dir, r_current_depth=1):
 			# build all file paths recursivly
 			r_chars = [c for c in '0123456789abcdef']
 			r_paths = []
 			# base case: return with list of files
 			if r_current_depth == self.__max_depth:
 				return [
 					(os.path.join(r_root_dir, c + '.json')) for c in r_chars
 				]
 			# recursion: go one step further in the filesystem
 			for c in r_chars:
 				for p in build_all_file_paths(
 					os.path.join(r_root_dir, c),
 					r_current_depth + 1
 				):
 					r_paths.append(p)
 			return r_paths
 		self.__all_file_paths = build_all_file_paths(self.__root_dir)
 	def __build_all_folder_paths(self):
 		"""
 		Calculates all folder paths
 		"""
 		# iterate over all files an extract their folders
 		for f in self.__all_file_paths:
 			path_tmp = os.path.split(f)[0]
 			while path_tmp != self.__root_dir:
 				if not path_tmp in self.__all_folder_paths:
 					self.__all_folder_paths.append(path_tmp)
 				path_tmp = os.path.dirname(path_tmp)
 		self.__all_folder_paths = sorted(self.__all_folder_paths)
 	def __create_meta_file(self):
 		"""
 		Creates the kvs meta file
 		"""
 		meta = {
 			'kvs_name':  self.__kvs_name,
 			'max_depth': self.__max_depth,
 			'entries':   self.__entries
 		}
 		return self.__save_dict_to_json_file(self.__meta_file, meta)
 	def __get_file_by_key(self, key):
 		"""
 		Calculates the corresponding json file for 'key'
 		"""
 		file  = self.__root_dir
 		chars = key[:(self.__max_depth - 1)]
 		for c in chars:
 			file = os.path.join(file, c)
 		file = os.path.join(
 			file,
 			key[(self.__max_depth - 1):self.__max_depth] + '.json'
 		)
 		return file
 	def __load_dict_from_json_file(self, path_to_file):
 		"""
 		Returns the content of the json file 'path_to_file' as dict or an empty
 		dict, when something went wrong. If something went wrong, maintain_kvs()
 		gets called (the meta file is an exception here).
 		"""
 		try:
 			with open(path_to_file, 'r', encoding='UTF-8') as f:
 				data_as_dict = json.load(f)
 				f.close()
 			return data_as_dict
 		except:
 			self.__save_dict_to_json_file(path_to_file, {})
 			if not path_to_file == self.__meta_file:
 				self.maintain_kvs()
 		return {}
 	def __load_meta_file(self):
 		"""
 		Reads the meta file or rebuilds it, if it is unreadable (broken/lost)
 		"""
 		def load_max_depth(meta):
 			if not 'max_depth' in meta:
 				return False
 			if not isinstance(meta['max_depth'], int):
 				return False
 			if not meta['max_depth'] in range(1, 7):
 				return False
 			self.__max_depth = meta['max_depth']
 			return True
 		def load_entries(meta):
 			if not 'entries' in meta:
 				return False
 			if not isinstance(meta['max_depth'], int):
 				return False
 			if not meta['entries'] >= 0:
 				return False
 			self.__entries = meta['entries']
 			return True
 		meta = self.__load_dict_from_json_file(self.__meta_file)
 		if meta == {}:
 			meta_file_restored = self.__restore_meta_file()
 			if not meta_file_restored:
 				return False
 			self.maintain_kvs()
 			meta = self.__load_dict_from_json_file(self.__meta_file)
 		if not load_max_depth(meta):
 			return False
 		if not load_entries(meta):
 			return False
 		return True
 	def __process_key(self, key):
 		"""
 		Processes the key 'key' to match the filesystem based hash table
 		"""
 		if len(key) < self.__max_depth:
 			return self.__str_to_sha256sum(key)
 		char_whitelist = [c for c in '0123456789abcdef']
 		for c in key:
 			if c not in char_whitelist:
 				return self.__str_to_sha256sum(key)
 		return key
 	def __restore_meta_file(self):
 		"""
 		Tries to restore an broken or lost meta file by guessing the 'max_depth'
 		"""
 		def get_max_depth(r_root_dir, r_current_depth=1):
 			# build all file paths recursivly
 			r_chars = [c for c in '0123456789abcdef']
 			# base case 1: r_current_depth > 7
 			if r_current_depth > 7:
 				return -1
 			# base case 2: json file found
 			for c in r_chars:
 				file = os.path.join(r_root_dir, c + '.json')
 				if os.path.exists(file):
 					return r_current_depth
 			# recursion: go one step further in the filesystem
 			for c in r_chars:
 				max_depth_guess = get_max_depth(
 					os.path.join(r_root_dir, c),
 					r_current_depth + 1
 				)
 				if max_depth_guess > -1:
 					return max_depth_guess
 			return -1
 		max_depth = get_max_depth(self.__root_dir)
 		if max_depth == -1:
 			return False
 		self.__max_depth = max_depth
 		return self.__create_meta_file()
 	def __save_dict_to_json_file(self, path_to_file, data_as_dict):
 		"""
 		Tries to write the dict 'data_as_dict' to the json file 'path_to_file'
 		"""
 		try:
 			str_to_write = json.dumps(
 				data_as_dict,
 				ensure_ascii=False
 			)
 			with open(path_to_file, 'w', encoding='UTF-8') as f:
 				f.write(str_to_write)
 				f.close()
 		except:
 			return False
 		return True
 	def __str_to_sha256sum(self, s):
 		"""
 		Returns a hexdigit sha256sum as string for the sring 's'
 		"""
 		return hashlib.sha256(bytes(s, 'utf-8')).hexdigest()
 	def __validate_key(self, key):
 		"""
 		Validates, if the key 'key' can be used for the kvs
 		"""
 		if not isinstance(key, str):
 			raise ValueError("key must be of type <class 'str'>")
 		if key == '':
 			raise ValueError("key must not be empty")
 		if len(key) > 64:
 			raise ValueError("key max length is 64 characters")
 	def __validate_value(self, value):
 		"""
 		Validates, if the value 'value' can be used for the kvs
 		"""
 		if isinstance(value, list):
 			for v in value:
 				self.__validate_value(v)
 			return
 		if isinstance(value, dict):
 			for k, v in value.items():
 				self.__validate_key(k)
 				self.__validate_value(v)
 			return
 		if not isinstance(value, (str, int, float, bool)):
 			raise ValueError(
 				"value must be of type"
 				+ " <class 'str'>, <class 'int'>, <class 'float'>"
 				+ " or <class 'bool'>"
 			)
--- a/fshtbkvs/init.py
+++ b/fshtbkvs/init.py
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@ -0,0 +1,597 @@
 import os
 import unittest
 from fshtbkvs.FSHTBKVS import FSHTBKVS
 class TestFSHTBKVS(unittest.TestCase):
 	# sha256sum of 'FSHTBKVS':
 	# 60bffff92d13cbd3fe063c018a2263238b01459c388edd5a1bcef5e61d0c46b5
 	def setUp(self):
 		self.kvs_root 	= '/tmp'
 		self.kvs_name 	= 'test_fshtbkvs'
 		self.max_depth 	= 3
 		self.kvs_path 	= os.path.join(self.kvs_root, self.kvs_name)
 	def test_000_kvs_created(self):
 		"""
 		Test if kvs was created
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name,
 			max_depth=self.max_depth
 		)
 		self.assertTrue(
 			os.path.exists(self.kvs_path),
 			self.kvs_path + ' not found!'
 		)
 		meta_file = os.path.join(self.kvs_path, 'meta.json')
 		self.assertTrue(
 			os.path.exists(meta_file),
 			meta_file + ' not found!'
 		)
 		chars = [c for c in '0123456789abcdef']
 		for c0 in chars:
 			for c1 in chars:
 				for c2 in chars:
 					f = os.path.join(
 						self.kvs_path,
 						c0,
 						c1,
 						c2 + '.json'
 					)
 					self.assertTrue(
 						os.path.exists(f),
 						f + ' not found!'
 					)
 	def test_001_meta_file_loading_and_getters(self):
 		"""
 		Test if value of a non existing key was written to file
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.get_kvs_name(), self.kvs_name)
 		self.assertEqual(kvs.get_max_depth(), self.max_depth)
 		self.assertEqual(kvs.get_entries(), 0)
 	def test_002_write_non_existing_key(self):
 		"""
 		Test if value of a non existing key was written to file
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.write('FSHTBKVS', 'is awesome!'), 1)
 		path_to_file = os.path.join(self.kvs_path, '6/0/b.json')
 		with open(path_to_file, 'r') as f:
 			data = f.read()
 			f.close()
 		data_expected = (
 			'{"'
 			+ '60bffff92d13cbd3fe063c018a2263238b01459c388edd5a1bcef5e61d0c46b5'
 			+ '": "is awesome!"}'
 		)
 		self.assertEqual(data, data_expected)
 		self.assertEqual(kvs.get_entries(), 1)
 	def test_003_write_existing_key(self):
 		"""
 		Test if value of an existing key was updated
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.write('FSHTBKVS', 'is really awesome!'), 1)
 		path_to_file = os.path.join(self.kvs_path, '6/0/b.json')
 		with open(path_to_file, 'r') as f:
 			data = f.read()
 			f.close()
 		data_expected = (
 			'{"'
 			+ '60bffff92d13cbd3fe063c018a2263238b01459c388edd5a1bcef5e61d0c46b5'
 			+ '": "is really awesome!"}'
 		)
 		self.assertEqual(data, data_expected)
 		self.assertEqual(kvs.get_entries(), 1)
 	def test_004_write_to_non_empty_json_file(self):
 		"""
 		Test if a new value can be added to non empty json file
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.write('60bffff92d', 1337), 1)
 		path_to_file = os.path.join(self.kvs_path, '6/0/b.json')
 		with open(path_to_file, 'r') as f:
 			data = f.read()
 			f.close()
 		data_expected = (
 			'{"'
 			+ '60bffff92d13cbd3fe063c018a2263238b01459c388edd5a1bcef5e61d0c46b5'
 			+ '": "is really awesome!", "60bffff92d": 1337}'
 		)
 		self.assertEqual(data, data_expected)
 		self.assertEqual(kvs.get_entries(), 2)
 	def test_005_read_existing_key(self):
 		"""
 		Test if existing key can be read
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		path_to_file = os.path.join(self.kvs_path, '6/0/b.json')
 		with open(path_to_file, 'r') as f:
 			data = f.read()
 			f.close()
 		self.assertEqual(kvs.read('FSHTBKVS'), 'is really awesome!')
 		self.assertEqual(kvs.read('60bffff92d'), 1337)
 	def test_006_read_non_existing_key(self):
 		"""
 		Test if existing key can be read
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.read('1337'), None)
 	def test_007_delete_existing_key(self):
 		"""
 		Test if existing key can be deleted
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.read('60bffff92d'), 1337)
 		self.assertEqual(kvs.delete('60bffff92d'), 1)
 		self.assertEqual(kvs.read('60bffff92d'), None)
 		self.assertEqual(kvs.get_entries(), 1)
 	def test_008_delete_non_existing_key(self):
 		"""
 		Test if non existing key can be deleted without errors
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.read('60bffff92d'), None)
 		self.assertEqual(kvs.delete('60bffff92d'), 1)
 		self.assertEqual(kvs.read('60bffff92d'), None)
 		self.assertEqual(kvs.get_entries(), 1)
 	def test_009_write_list(self):
 		"""
 		Test if a list can be stored in the kvs
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		the_first_list = [
 			'I like big butts and I can not lie',
 			1584662760,
 			False,
 			3.141592
 		]
 		self.assertEqual(kvs.write('the_first_list', the_first_list), 1)
 		self.assertEqual(kvs.read('the_first_list'), the_first_list)
 		class ClassesAreNotSupported:
 			def __init__(self, power=0):
 				self.power = power
 				if self.power > 9000:
 					print("It's Over 9000!!!")
 		piccolo = ClassesAreNotSupported(408)
 		the_first_list.append(piccolo)
 		with self.assertRaises(ValueError):
 			kvs.write('the_first_list', the_first_list)
 		self.assertEqual(kvs.delete('the_first_list'), 1)
 	def test_010_write_nested_list(self):
 		"""
 		Test if a nested list can be stored in the kvs
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		the_first_nested_list = [
 			[
 				1,
 				'Django: The web framework for perfectionists with deadlines.'
 			],
 			[
 				2,
 				'Bottle: Python Web Framework'
 			],
 			[
 				3,
 				'Flask'
 			]
 		]
 		self.assertEqual(kvs.write('the_first_nested_list', the_first_nested_list), 1)
 		self.assertEqual(kvs.read('the_first_nested_list'), the_first_nested_list)
 		class ClassesAreNotSupported:
 			def __init__(self, power=0):
 				self.power = power
 				if self.power > 9000:
 					print("It's Over 9000!!!")
 		bulma = ClassesAreNotSupported(12)
 		the_first_nested_list[-1].append(bulma)
 		with self.assertRaises(ValueError):
 			kvs.write('the_first_nested_list', the_first_nested_list)
 		self.assertEqual(kvs.delete('the_first_nested_list'), 1)
 	def test_011_write_dict(self):
 		"""
 		Test if a dict can be stored in the kvs
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		the_first_dict = {
 			'brand': 	'Ford',
 			'model': 	'Mustang',
 			'year': 	1964
 		}
 		self.assertEqual(kvs.write('the_first_dict', the_first_dict), 1)
 		self.assertEqual(kvs.read('the_first_dict'), the_first_dict)
 		the_first_dict[0] = 0
 		with self.assertRaises(ValueError):
 			kvs.write('the_first_dict', the_first_dict)
 		del the_first_dict[0]
 		class ClassesAreNotSupported:
 			def __init__(self, power=0):
 				self.power = power
 				if self.power > 9000:
 					print("It's Over 9000!!!")
 		piccolo = ClassesAreNotSupported(408)
 		the_first_dict['driver'] = piccolo
 		with self.assertRaises(ValueError):
 			kvs.write('the_first_dict', the_first_dict)
 		self.assertEqual(kvs.delete('the_first_dict'), 1)
 	def test_012_write_nested_dict(self):
 		"""
 		Test if a nested dict can be stored in the kvs
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		the_first_nested_dict = {
 			'0': {
 				'brand': 	'Ford',
 				'model': 	'Mustang',
 				'year': 	1964
 			},
 			'1': {
 				'brand': 	'AC Cars',
 				'model': 	'AC Cobra',
 				'year': 	1962
 			},
 			'2': {
 				'brand': 	'Rimac',
 				'model': 	'Nevera',
 				'year': 	2021
 			}
 		}
 		self.assertEqual(kvs.write('the_first_nested_dict', the_first_nested_dict), 1)
 		self.assertEqual(kvs.read('the_first_nested_dict'), the_first_nested_dict)
 		class ClassesAreNotSupported:
 			def __init__(self, power=0):
 				self.power = power
 				if self.power > 9000:
 					print("It's Over 9000!!!")
 		bulma = ClassesAreNotSupported(12)
 		the_first_nested_dict['2']['driver'] = bulma
 		with self.assertRaises(ValueError):
 			kvs.write('the_first_nested_dict', the_first_nested_dict)
 		self.assertEqual(kvs.delete('the_first_nested_dict'), 1)
 	def test_013_maintain_kvs_json_file_broken(self):
 		"""
 		Test if the kvs can get maintained when a json file is broken
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		path_to_file = os.path.join(self.kvs_path, 'f/f/f.json')
 		self.assertEqual(kvs.write('fffffff', "Epstein didn't kill himself"), 1)
 		self.assertEqual(kvs.read('fffffff'), "Epstein didn't kill himself")
 		self.assertEqual(kvs.get_entries(), 2)
 		with open(path_to_file, 'w', encoding='UTF-8') as f:
 			f.write('{"fffffff": "Epstein didn\'t kill himself"')
 			f.close()
 		self.assertEqual(kvs.read('fffffff'), None)
 		self.assertEqual(kvs.get_entries(), 1)
 		with open(path_to_file, 'r', encoding='UTF-8') as f:
 			data = f.read()
 			f.close()
 		self.assertEqual(data, '{}')
 	def test_014_maintain_kvs_json_file_lost(self):
 		"""
 		Test if the kvs can get maintained when a json file is lost
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.write('fffffff', "Epstein didn't kill himself"), 1)
 		self.assertEqual(kvs.read('fffffff'), "Epstein didn't kill himself")
 		self.assertEqual(kvs.get_entries(), 2)
 		path_to_file = os.path.join(self.kvs_path, 'f/f/f.json')
 		os.remove(path_to_file)
 		self.assertEqual(kvs.read('fffffff'), None)
 		self.assertEqual(kvs.get_entries(), 1)
 		with open(path_to_file, 'r', encoding='UTF-8') as f:
 			data = f.read()
 			f.close()
 		self.assertEqual(data, '{}')
 	def test_015_maintain_kvs_meta_file_broken(self):
 		"""
 		Test if the kvs can get maintained when the meta file is broken
 		"""
 		path_to_file = os.path.join(self.kvs_path, 'meta.json')
 		with open(path_to_file, 'w', encoding='UTF-8') as f:
 			f.write(
 				'{"kvs_name": "test_fshtbkvs", "max_depth": 3, "entries": 1'
 			)
 			f.close()
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.read('FSHTBKVS'), 'is really awesome!')
 		path_to_file = os.path.join(self.kvs_path, 'meta.json')
 		with open(path_to_file, 'r') as f:
 			data = f.read()
 			f.close()
 		data_expected = (
 			'{"kvs_name": "test_fshtbkvs", "max_depth": 3, "entries": 1}'
 		)
 		self.assertEqual(data, data_expected)
 	def test_016_maintain_kvs_meta_file_lost(self):
 		"""
 		Test if the kvs can get maintained when the meta file is lost
 		"""
 		path_to_file = os.path.join(self.kvs_path, 'meta.json')
 		os.remove(path_to_file)
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.read('FSHTBKVS'), 'is really awesome!')
 		path_to_file = os.path.join(self.kvs_path, 'meta.json')
 		with open(path_to_file, 'r') as f:
 			data = f.read()
 			f.close()
 		data_expected = (
 			'{"kvs_name": "test_fshtbkvs", "max_depth": 3, "entries": 1}'
 		)
 		self.assertEqual(data, data_expected)
 	def test_017_export_kvs(self):
 		"""
 		Test if the kvs can get exported
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		entries = {
 			"e94e8ed9c2": "alfredissimo!",
 			"5db1fee4b5": 1337,
 			"26436a96b6": "Who controls the past controls the future.",
 			"58b6c6c96c": "https://blog.fefe.de/",
 			"8139b33952": 0.9,
 			"f99f33e288": "de_dust2",
 			"e08e0bd862": "Who controls the present controls the past.",
 			"3cbc87c768": True,
 			"bbb9abde2d": "Wenn eine Aussage einen trifft, war sie wahrscheinlich auch zutreffend.",
 			"de650d61f5": 4711
 		}
 		for key, value in entries.items():
 			self.assertEqual(kvs.write(key, value), 1)
 		path_to_file = os.path.join(self.kvs_path, 'd/e/6.json')
 		with open(path_to_file, 'w', encoding='UTF-8') as f:
 			f.write('{"de650d61f5": 4711')
 			f.close()
 		path_to_file = os.path.join(
 			self.kvs_root,
 			self.kvs_name,
 			self.kvs_name + '.fshtbkvs'
 		)
 		kvs.export_kvs(str(path_to_file))
 		expected_exports = [
 			'{"26436a96b6": "Who controls the past controls the future."}',
 			'{"3cbc87c768": true}',
 			'{"58b6c6c96c": "https://blog.fefe.de/"}',
 			'{"5db1fee4b5": 1337}',
 			'{"60bffff92d13cbd3fe063c018a2263238b01459c388edd5a1bcef5e61d0c46b5": "is really awesome!"}',
 			'{"8139b33952": 0.9}',
 			'{"bbb9abde2d": "Wenn eine Aussage einen trifft, war sie wahrscheinlich auch zutreffend."}',
 			'{"e08e0bd862": "Who controls the present controls the past."}',
 			'{"e94e8ed9c2": "alfredissimo!"}',
 			'{"f99f33e288": "de_dust2"}'
 		]
 		with open(path_to_file, 'r') as f:
 			lines = f.readlines()
 			f.close()
 		line_number = 0
 		for line in lines:
 			data_expected = expected_exports[line_number]
 			self.assertEqual(line.strip(), data_expected)
 			line_number += 1
 	def test_018_wipe_kvs(self):
 		"""
 		Test if the kvs can get wiped
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.wipe_kvs(), 1)
 		chars = [c for c in '0123456789abcdef']
 		for c0 in chars:
 			for c1 in chars:
 				for c2 in chars:
 					path_to_file = os.path.join(
 						self.kvs_path,
 						c0,
 						c1,
 						c2 + '.json'
 					)
 					with open(path_to_file, 'r') as f:
 						data = f.read()
 						f.close()
 					self.assertEqual(data, '{}')
 		self.assertEqual(kvs.get_entries(), 0)
 	def test_019_import_kvs(self):
 		"""
 		Test if the kvs can get wiped
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		path_to_file = os.path.join(
 			self.kvs_root,
 			self.kvs_name,
 			self.kvs_name + '.fshtbkvs'
 		)
 		self.assertEqual(kvs.import_kvs(str(path_to_file)), 1)
 		self.assertEqual(kvs.read('26436a96b6'), 'Who controls the past controls the future.')
 		self.assertEqual(kvs.read('3cbc87c768'), True)
 		self.assertEqual(kvs.read('58b6c6c96c'), 'https://blog.fefe.de/')
 		self.assertEqual(kvs.read('5db1fee4b5'), 1337)
 		self.assertEqual(kvs.read('FSHTBKVS'), 'is really awesome!')
 		self.assertEqual(kvs.read('8139b33952'), 0.9)
 		self.assertEqual(kvs.read('bbb9abde2d'), 'Wenn eine Aussage einen trifft, war sie wahrscheinlich auch zutreffend.')
 		self.assertEqual(kvs.read('e08e0bd862'), 'Who controls the present controls the past.')
 		self.assertEqual(kvs.read('e94e8ed9c2'), 'alfredissimo!')
 		self.assertEqual(kvs.read('f99f33e288'), 'de_dust2')
 		self.assertEqual(kvs.get_entries(), 10)
 	def test_020_get_size_of_kvs(self):
 		"""
 		Test if the size in bytes of the kvs can get calculated
 		"""
 		kvs = FSHTBKVS(
 			self.kvs_root,
 			self.kvs_name
 		)
 		self.assertEqual(kvs.get_size_of_kvs(), 0.008627)
 def purge_test_kvs():
 	if os.path.exists('/tmp/test_fshtbkvs'):
 		os.system('rm -rf /tmp/test_fshtbkvs')
 if __name__ == '__main__':
 	purge_test_kvs()
 	unittest.main()
 	# purge_test_kvs()