diff --git a/private/test/test_ListUsers.py b/private/test/test_ListUsers.py
index 27a158a..d3e5ff6 100644
--- a/private/test/test_ListUsers.py
+++ b/private/test/test_ListUsers.py
@@ -13,6 +13,12 @@ class TestListUsers(unittest.TestCase):
         except IOError as fs_err:
             self.fail(fs_err)
 
+    def test_singleUser(self):
+        try:
+            ListUsers(testcfg.test_db, single_user=testcfg.assured_user)
+        except Exception:
+            self.fail()
+
     def test_output_as_list(self):
         # count newlines in string, everything under 3 is wrong, and above 20 too.
         out = self.list.output_as_list().splitlines()
diff --git a/private/test/test_Validator.py b/private/test/test_Validator.py
index 3ead2a8..866a55d 100644
--- a/private/test/test_Validator.py
+++ b/private/test/test_Validator.py
@@ -15,6 +15,9 @@ class TestValidator(unittest.TestCase):
         for name in testcfg.Validator_Invalid_Users_Chars_List:
             self.assertFalse(self.validator.checkUsernameCharacters(name), name)
 
+        for name in testcfg.genRandomString():
+            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))
@@ -25,20 +28,22 @@ class TestValidator(unittest.TestCase):
         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), name)
+
+        for name in testcfg.genRandomString():
             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?
+
+        for User in testcfg.genRandomString():
+            self.assertFalse(self.validator.checkUserExists(User))
 
     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))
 
@@ -51,12 +56,18 @@ class TestValidator(unittest.TestCase):
     def test_check_datetime_format(self):
         for cur in testcfg.Validator_valid_datetime:
             self.assertTrue(self.validator.checkDatetimeFormat(cur))
+        for cur in testcfg.Validator_invalid_checkname_names:
+            self.assertFalse(self.validator.checkDatetimeFormat(cur))
+        for cur in testcfg.genRandomString():
+            self.assertFalse(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))
+        for name in testcfg.Validator_valid_checkname_names:
+            self.assertTrue(self.validator.checkName(name))
+        for name in testcfg.Validator_invalid_checkname_names:
+            self.assertFalse(self.validator.checkName(name))
+        for name in testcfg.genRandomString(alphabet="\n\b\r\t\f"):
+            self.assertFalse(self.validator.checkName(name))
 
     def test_check_import_file(self):
         self.assertTrue(self.validator.checkImportFile(testcfg.test_import_csv,
diff --git a/private/test/testcfg.py b/private/test/testcfg.py
index 1150e1f..a753802 100644
--- a/private/test/testcfg.py
+++ b/private/test/testcfg.py
@@ -1,3 +1,16 @@
+test_random_iterations: int = 50
+
+
+def genRandomString(iterations: int = test_random_iterations, size: int = 20, alphabet: str = ""):
+    import random, string
+    if alphabet == "":
+        letters = string.digits + string.printable + string.ascii_letters
+    else:
+        letters = alphabet
+    for i in range(iterations):
+        yield ''.join(random.choice(letters) for i in range(size)).capitalize()
+
+assured_user: str = "darksider3"
 test_backup_csv: str = "test/testbackup.csv"
 test_db: str = "./test/applications.sqlite"
 test_import_csv: str = "test/testimport.csv"
@@ -39,7 +52,9 @@ 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_datetime: list = ["2020-10-07 14:15:30", "2020-01-07 12:23:11"]
+Validator_ivvalid_datetime: list = ["20201007 14:15:30", "2020-01-07 122311"]
 
 Validator_valid_checkname_names: list = ["HalloWelt"]
 Validator_invalid_checkname_names: list = ["\\n", "\n\b"]
\ No newline at end of file