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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..7dca4db
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+++ b/test/haketilo_test/unit/test_haketilo_apis.py
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+# 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();'
+
+@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/')
+    driver.execute_script(
+        '''
+        const fetch_arg = {
+            url: "https://anotherdoma.in/resource/blocked/by/CORS.json",
+            init: {}
+        };
+
+        const detail = {
+            data: JSON.stringify(fetch_arg),
+            id:   "abcdef"
+        };
+
+        window.addEventListener("haketilo_CORS_bypass-abcdef",
+                                e => window.__response = e.detail);
+        window.dispatchEvent(new CustomEvent("haketilo_CORS_bypass", {detail}));
+        ''')
+
+    get_response = lambda d: d.execute_script("return window.__response;")
+    response = WebDriverWait(driver, 10).until(get_response)
+    response = json.loads(response)
+
+    assert response['body'] == some_data.encode().hex()
+    assert response['status'] == 200
+    assert type(response['headers']) is list