diff --git a/myhpi/tests/core/test_email_utils.py b/myhpi/tests/core/test_email_utils.py
new file mode 100644
index 00000000..c95a75c6
--- /dev/null
+++ b/myhpi/tests/core/test_email_utils.py
@@ -0,0 +1,32 @@
+from unittest import TestCase
+
+from myhpi import settings
+from myhpi.core.utils import (
+    alternative_emails,
+    email_belongs_to_domain,
+    replace_email_domain,
+    toggle_institution,
+)
+
+
+class EmailUtilTest(TestCase):
+    def test_email_belongs_to_domain(self):
+        emails = ["abc@example.com", "abc@myhpi.de"]
+        domains = ["example.com", "myhpi.de"]
+        for email, domain in zip(emails, domains):
+            self.assertTrue(email_belongs_to_domain(email, domain))
+        self.assertFalse(email_belongs_to_domain(emails[0], domains[1]))
+
+    def test_replace_email_domain(self):
+        email = "abc@example.com"
+        original_domain = "example.com"
+        new_domain = "myhpi.de"
+        self.assertEqual(replace_email_domain(email, original_domain, new_domain), "abc@myhpi.de")
+
+    def test_toggle_institution(self):
+        emails = ["user1@hpi.uni-potsdam.de", "user2@unrelated.com", "user3@hpi.de"]
+        expected = ["user1@hpi.de", "user2@unrelated.com", "user3@hpi.uni-potsdam.de"]
+        for email, expected_email in zip(emails, expected):
+            toggled = list(toggle_institution(email))
+            if not "unrelated" in email:
+                self.assertEqual(toggled[0], expected_email)