diff --git a/private/lib/__init__.py b/private/lib/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/private/test/test_Validator.py b/private/test/test_Validator.py
new file mode 100644
index 0000000..3ead2a8
--- /dev/null
+++ b/private/test/test_Validator.py
@@ -0,0 +1,65 @@
+import sys
+sys.path.append('..')
+import unittest
+import lib.Validator
+import test.testcfg as testcfg
+
+
+class TestValidator(unittest.TestCase):
+    def setUp(self) -> None:
+        self.validator = lib.Validator
+
+    def test_check_username_characters(self):
+        for name in testcfg.Validator_Valid_Users_Chars_List:
+            self.assertTrue(self.validator.checkUsernameCharacters(name))
+        for name in testcfg.Validator_Invalid_Users_Chars_List:
+            self.assertFalse(self.validator.checkUsernameCharacters(name), name)
+
+    def test_check_username_length(self):
+        for name in testcfg.Validator_Valid_Users_Length:
+            self.assertTrue(self.validator.checkUsernameLength(name))
+        for name in testcfg.Validator_Invalid_Users_Length:
+            self.assertFalse(self.validator.checkUsernameLength(name), name)
+
+    def test_check_email(self):
+        for name in testcfg.Validator_Valid_Mail:
+            self.assertTrue(self.validator.checkEmail(name))
+        for name in testcfg.Validator_Invalid_Mail:
+            self.assertFalse(self.validator.checkEmail(name))
+
+    def test_check_user_exists(self):
+        self.assertTrue(self.validator.checkUserExists("root"))
+        self.assertTrue(self.validator.checkUserExists("nobody")) # remove in case there exists an actual system without
+        self.assertFalse(self.validator.checkUserExists("blsjdkfl"))
+        self.assertFalse(self.validator.checkUserExists("b90123ijk"))
+        self.assertFalse(self.validator.checkUserExists("curArrSosss"))
+        self.assertFalse(self.validator.checkUserExists("123WildPack123"))
+        # are there any more users which are assertable?
+
+    def test_check_user_in_db(self):
+        for name in testcfg.Validator_db_user_exists:
+            self.assertTrue(self.validator.checkUserInDB(name, testcfg.test_db))
+        for name in testcfg.Validator_db_user_inexistent:
+            self.assertFalse(self.validator.checkUserInDB(name, testcfg.test_db))
+
+    def test_check_sshkey(self):
+        for key in testcfg.Validator_valid_ssh:
+            self.assertTrue(self.validator.checkSSHKey(key))
+        for key in testcfg.Validator_invalid_ssh:
+            self.assertFalse(self.validator.checkSSHKey(key))
+
+    def test_check_datetime_format(self):
+        for cur in testcfg.Validator_valid_datetime:
+            self.assertTrue(self.validator.checkDatetimeFormat(cur))
+
+    def test_check_name(self):
+        for checkname in testcfg.Validator_valid_checkname_names:
+            self.assertTrue(self.validator.checkName(checkname))
+        for checkname in testcfg.Validator_invalid_checkname_names:
+            self.assertFalse(self.validator.checkName(checkname))
+
+    def test_check_import_file(self):
+        self.assertTrue(self.validator.checkImportFile(testcfg.test_import_csv,
+                                                       testcfg.test_db))
+        if not self.validator.checkImportFile(testcfg.test_import_invalid_csv, testcfg.test_db):
+            self.fail("Invalid import file should've failed the test")
diff --git a/private/test/testcfg.py b/private/test/testcfg.py
index 1fc8f5b..1150e1f 100644
--- a/private/test/testcfg.py
+++ b/private/test/testcfg.py
@@ -1,4 +1,45 @@
 test_backup_csv: str = "test/testbackup.csv"
 test_db: str = "./test/applications.sqlite"
+test_import_csv: str = "test/testimport.csv"
+test_import_invalid_csv: str = "test/testimport_fail.csv"
 ListUsers_fetch_size_min: int = 3
-ListUsers_output_newlines: int = 1
\ No newline at end of file
+ListUsers_output_newlines: int = 1
+
+Validator_Valid_Users_Chars_List: list = ["darksider", "dirty", "hAndS", "world312Lol"]
+Validator_Invalid_Users_Chars_List: list = ["12", "#uß", "Rawr"]
+
+Validator_Valid_Users_Length: list = ["w💁💁💞💞elt", "hallo", "japp", "eksdee", "harrharr", "räraRüdigerSauß하",
+                                      "التَّطْبِيقَاتُ",
+                                      "𝓽𝓱𝓮", "𝓵𝓪𝔃𝔂", "𝓭𝓸𝓰"]
+Validator_Invalid_Users_Length: list = ["f", "i", "fa", "fo", "ar"]
+
+Validator_Valid_Mail: list = ["larp@example.org", "rawr@lulz.com", "woerld@hassa.fun"]
+Validator_Invalid_Mail: list = ["läÄ@wi", "@rawr.", ".com", "@.de", ".@.de"]
+
+Validator_db_user_exists: list = ["darksider3", "Darksider2", "Darksider1"]
+Validator_db_user_inexistent: list = ["welt", "world", "hä#", "root"]
+
+# @TODO: More valid and invalid test keys...
+Validator_valid_ssh: list = ["""ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQC7qmegDxzv1omqG2cWM+
+i+qaEGzCoSBwqCeXyGUU93sTqtNYYHJVGj6YZqXeXEGzJtKm2A/uo59Y+WmqhJgW7HcT2Hqvo80NfbIRhqE9TJETyBe
+GiiC8qpiYgPC2zigCNvTsRXh0CH5FJ1qy4QEBjztQDWOqSrsoOSJEEWCJiKJizTiXDmlGdiKE409GBo8lvlbMRWbrMj
+3iX825WTqy/T0Pio1kqANDotLnPA0sRXUPVyzc/ghzqRHzFetzP9j7C0nh
+EvjiJphiuYvhbgix79FrCQG0lXBGcAWzsWUeAoT/d3kQu79+UTWxm+z4pnJ7gkKVMejqrWys560SdAqD264dc5UBRGI9j6X
+xVKdraSaEitDneONrSAt2tE/RwRxh2ASxqQfdF88zyDI8/ma608tHc
+FROaNsn5hF+/wzjRK9akdhp5WjA5HXhg2OlkwKvSMhGlSgotRj5pr4Ebxjegysy1mEWRFN/vh/oNq4uHQy8adpfogaVELkI/Z2nuAdQk
++uMy6D1hrKhUWubmBPxTbG00IWF25Tyuz8hnFRP9+gB/P
+NRlF59/EHy27a72nirvuOyfxKnx/Mn+FD9Ah59OSLhWuo3sN9Im8yc2cliecwMz+DmTtE7TwzNw9v2zfxU9JDQwyLtppULiGpmKFOLHjz
++SVGxSbVsWS//IyNK1GrQ== gschoenb@gschoenb-X220""",
+                             """ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAklOUpkDHrfHY17SbrmTIpNLTGK9Tjom/BWDSU
+GPl+nafzlHDTYW7hdI4yZ5ew18JH4JW9jbhUFrviQzM7xlELEVf4h9lFX5QVkbPppSwg0cda3
+Pbv7kOdJ/MTyBlWXFCR+HAo3FXRitBqxiX1nKhXpHAZsMciLq8V6RjsNAQwdsdMFvSlVK/7XA
+t3FaoJoAsncM1Q9x5+3V0Ww68/eIFmb1zuUFljQJKprrX88XypNDvjYNby6vw/Pb0rwert/En
+mZ+AW4OZPnTPI89ZPmVMLuayrD2cE86Z/il8b+gw3r3+1nKatmIkjn2so1d01QraTlMqVSsbx
+NrRFi9wrf+M7Q== schacon@mylaptop.local"""]
+Validator_invalid_ssh: list = ["lol.", "ssh-rsa lol."]
+
+#Y-%m-%d %H:%M:%S
+Validator_valid_datetime: list = ["2020-10-07 14:15:30"]
+
+Validator_valid_checkname_names: list = ["HalloWelt"]
+Validator_invalid_checkname_names: list = ["\\n", "\n\b"]
\ No newline at end of file