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diff --git a/test/haketilo_test/unit/test_haketilo_apis.py b/test/haketilo_test/unit/test_haketilo_apis.py
new file mode 100644
index 0000000..af7906d
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+++ b/test/haketilo_test/unit/test_haketilo_apis.py
@@ -0,0 +1,129 @@
+# SPDX-License-Identifier: CC0-1.0
+
+"""
+Haketilo unit tests - exposing some special functionalities to injected scripts
+"""
+
+# This file is part of Haketilo
+#
+# Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the CC0 1.0 Universal License as published by
+# the Creative Commons Corporation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# CC0 1.0 Universal License for more details.
+
+import pytest
+import json
+from selenium.webdriver.support.ui import WebDriverWait
+
+from ..script_loader import load_script
+from ..world_wide_library import some_data
+
+def content_script():
+    return load_script('content/haketilo_apis.js') + ';\nstart();'
+
+def background_script():
+    return load_script('background/CORS_bypass_server.js') + ';\nstart();'
+
+resource_url = 'https://anotherdoma.in/resource/blocked/by/CORS.json'
+
+@pytest.mark.ext_data({
+    'content_script': content_script,
+    'background_script': background_script
+})
+@pytest.mark.usefixtures('webextension')
+def test_haketilo_apis_CORS_bypass(driver):
+    """
+    Verify injected scripts will be able to bypass CORS with the help of
+    Haketilo API.
+    """
+    driver.get('https://gotmyowndoma.in/')
+
+    # First, verify that it is impossible to normally fetch the resource.
+    with pytest.raises(Exception, match='NetworkError'):
+        driver.execute_script('return fetch(arguments[0]);', resource_url)
+
+    # First, verify that it is possible to fetch the resource using API.
+    response = driver.execute_script(
+        '''
+        const fetch_arg = {
+            url: arguments[0],
+            init: {},
+            verify_that_nonstandard_properties_are_ignored: ":)"
+        };
+
+        const detail = {
+            data: JSON.stringify(fetch_arg),
+            id:   "abcdef",
+            nonstandard_properties_verify_that_ignored_are: ":o"
+        };
+
+        let cb, done = new Promise(_cb => cb = _cb);
+        window.addEventListener("haketilo_CORS_bypass-abcdef",
+                                e => cb(JSON.parse(e.detail)));
+        window.dispatchEvent(new CustomEvent("haketilo_CORS_bypass", {detail}));
+
+        return done;
+        ''',
+        resource_url)
+
+    assert response['body'] == some_data.encode().hex()
+    assert response['status'] == 200
+    assert type(response['headers']) is list
+
+@pytest.mark.ext_data({
+    'content_script': content_script,
+    'background_script': background_script
+})
+@pytest.mark.usefixtures('webextension')
+@pytest.mark.parametrize('error', [
+    'bad url',
+    'no_url',
+    'non_string_url',
+    'non_object_init',
+    'non_object_detail',
+    'non_string_id',
+    'non_string_data'
+])
+def test_haketilo_apis_CORS_bypass_errors(driver, error):
+    """
+    Verify errors are returned properly by CORS_bypass API.
+    """
+    data = {
+        'bad_url':         {'url': 'muahahahaha', 'init': {}},
+        'no_url':          {'init': {}},
+        'non_string_url':  {'url': {}, 'init': {}},
+        'non_object_init': {'url': {}, 'init': ":d"},
+    }.get(error, {'url': resource_url, 'init': {}})
+
+    detail = {
+        'non_object_detail': '!!!',
+        'non_string_id':     {'data': json.dumps(data), 'id': None},
+        'non_string_data':   {'data': data, 'id': 'abcdef'}
+    }.get(error, {'data': json.dumps(data), 'id': 'abcdef'})
+
+    driver.get('https://gotmyowndoma.in/')
+
+    result = driver.execute_script(
+        '''
+        let cb, done = new Promise(_cb => cb = _cb);
+        window.addEventListener("haketilo_CORS_bypass-abcdef",
+                                e => cb(JSON.parse(e.detail)));
+        window.dispatchEvent(new CustomEvent("haketilo_CORS_bypass",
+                                             {detail: arguments[0]}));
+        setTimeout(() => cb("timeout"), 5000);
+
+        return done;
+        ''',
+        detail)
+
+    if error in {'bad_url', 'no_url', 'non_string_url', 'non_object_init'}:
+        assert result['error']['name'] == 'TypeError'
+
+    if error in {'non_object_detail', 'non_string_id', 'non_string_data'}:
+        assert result == 'timeout'