diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/mock_classes.py b/tests/mock_classes.py
new file mode 100644
index 0000000..a2c3398
--- /dev/null
+++ b/tests/mock_classes.py
@@ -0,0 +1,30 @@
+class MockHTTPResponse:
+    def __init__(self, sock=None, debuglevel=0, method=None, url=None):
+        pass
+
+    def getheaders(self):
+        return [
+            ('x-xss-protection', '1;'),
+            ('server', 'nginx')
+        ]
+
+    def getsomething(self):
+        pass
+
+
+class MockHTTPSConnection:
+    def __init__(self, h, context, timeout):
+        pass
+
+    def request(self, method, url, headers):
+        pass
+
+    def headers(self):
+        return "content-type", "accept"
+
+    def getresponse(self):
+        a = MockHTTPResponse()
+        return a
+
+    def close(self):
+        pass
diff --git a/tests/test_securityheaders.py b/tests/test_securityheaders.py
new file mode 100644
index 0000000..6bf3128
--- /dev/null
+++ b/tests/test_securityheaders.py
@@ -0,0 +1,41 @@
+from unittest import mock, TestCase
+from urllib.parse import ParseResult
+
+from secheaders.securityheaders import SecurityHeaders
+
+from .mock_classes import MockHTTPSConnection
+
+
+@mock.patch("http.client.HTTPSConnection", MockHTTPSConnection)
+class TestSecurityHeaders(TestCase):
+
+    def test_init(self) -> None:
+        secheaders = SecurityHeaders("https://www.example.com", 0)
+        assert secheaders.target_url == ParseResult(
+            scheme='https', netloc='www.example.com', path='', params='', query='', fragment='')
+
+    def test_fetch_headers(self) -> None:
+        secheaders = SecurityHeaders("https://www.example.com", 0)
+        expected_value = {
+            'server': 'nginx',
+            'x-xss-protection': '1;',
+        }
+        secheaders.fetch_headers()
+        assert secheaders.headers == expected_value
+
+    def test_eval_headers(self) -> None:
+        secheaders = SecurityHeaders("https://www.example.com", 0)
+        expected_value = {
+            'x-frame-options': {'defined': False, 'warn': True, 'contents': None, 'notes': []},
+            'strict-transport-security': {'defined': False, 'warn': True, 'contents': None, 'notes': []},
+            'content-security-policy': {'defined': False, 'warn': True, 'contents': None, 'notes': []},
+            'x-content-type-options': {'defined': False, 'warn': True, 'contents': None, 'notes': []},
+            'x-xss-protection': {'defined': True, 'warn': True, 'contents': '1;', 'notes': []},
+            'referrer-policy': {'defined': False, 'warn': True, 'contents': None, 'notes': []},
+            'permissions-policy': {'defined': False, 'warn': True, 'contents': None, 'notes': []},
+            'server': {'defined': True, 'warn': False, 'contents': 'nginx', 'notes': []},
+        }
+
+        secheaders.fetch_headers()
+        res = secheaders.check_headers()
+        assert res == expected_value
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 0000000..67bae08
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,74 @@
+from unittest import TestCase
+from secheaders import utils
+from secheaders.constants import EVAL_OK, EVAL_WARN
+
+
+class TestUtils(TestCase):
+
+    def test_csp_parser(self) -> None:
+        example_csp = (
+            "default-src 'none' *.example.com; script-src 'self' src.example.com 'unsafe-inline'; connect-src 'self';"
+            "img-src *; style-src 'self'; base-uri 'self';form-action 'self'"
+        )
+        expected_value = {
+            "default-src": ["'none'", "*.example.com"],
+            "script-src": ["'self'", "scripts.example.com", "'unsafe-inline'"],
+            "connect-src": ["'self'"],
+            "img-src": ["*"],
+            "style-src": ["'self'"],
+            "base-uri": ["'self'"],
+            "form-action": ["'self'"],
+        }
+        res = utils.csp_parser(example_csp)
+        assert res == expected_value
+
+    def test_eval_csp(self) -> None:
+        unsafe_csp = (
+            "default-src 'none' *.example.com; script-src 'self' src.example.com 'unsafe-inline'; connect-src 'self';"
+            "img-src *; style-src 'self'; base-uri 'self';form-action 'self'"
+        )
+        res = utils.eval_csp(unsafe_csp)
+        expected_value = (
+            EVAL_WARN,
+            ["Unsafe source 'unsafe-inline' in directive script-src"]
+        )
+        assert res == expected_value
+
+        safe_csp = "default-src 'self'; img-src 'self' cdn.example.com;"
+        expected_value = (EVAL_OK, [])
+        res = utils.eval_csp(safe_csp)
+        assert res == expected_value
+
+    def test_eval_version_info(self) -> None:
+        nginx_banner_warn = 'nginx 1.17.10 (Ubuntu)'
+        nginx_banner_ok = 'nginx'
+        res = utils.eval_version_info(nginx_banner_warn)
+        assert res == (EVAL_WARN, [])
+        res = utils.eval_version_info(nginx_banner_ok)
+        assert res == (EVAL_OK, [])
+
+    def test_permissions_policy_parser(self) -> None:
+        example_pp = (
+            'geolocation=(src "https://a.example.com" "https://b.example.com"), picture-in-picture=(), camera=*;'
+        )
+        expected_value = {
+            'geolocation': ['src', '"https://a.example.com"', '"https://b.example.com"'],
+            'picture-in-picture': [],
+            'camera': ['*'],
+        }
+        res = utils.permissions_policy_parser(example_pp)
+        assert expected_value == res
+
+    def test_eval_permissions_policy(self) -> None:
+        unsafe_pp = 'geolocation=(src "https://a.example.com"), picture-in-picture=(), camera=*;'
+        expected_value = (EVAL_WARN, [
+                "Privacy-sensitive feature 'camera' allowed from unsafe origin '*'",
+                "Privacy-sensitive feature 'microphone' not defined in permission-policy, always allowed.",
+                "Privacy-sensitive feature 'payment' not defined in permission-policy, always allowed.",
+        ])
+        res = utils.eval_permissions_policy(unsafe_pp)
+        assert res == expected_value
+        safe_pp = "geolocation=(src), camera=(), microphone=(), payment=()"
+        expected_value = EVAL_OK, []
+        res = utils.eval_permissions_policy(safe_pp)
+        assert res == expected_value