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diff --git a/test/haketilo_test/unit/test_basic.py b/test/haketilo_test/unit/test_basic.py
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+++ b/test/haketilo_test/unit/test_basic.py
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+# SPDX-License-Identifier: CC0-1.0
+
+"""
+Haketilo unit tests - base
+"""
+
+# This file is part of Haketilo
+#
+# Copyright (C) 2021, Wojtek Kosior
+#
+# 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
+
+from ..script_loader import load_script
+from ..extension_crafting import ExtraHTML
+
+def test_driver(driver):
+    """
+    A trivial test case that verifies mocked web pages served by proxy can be
+    accessed by the browser driven.
+    """
+    for proto in ['http://', 'https://']:
+        driver.get(proto + 'gotmyowndoma.in')
+        title = driver.execute_script(
+            'return document.getElementsByTagName("title")[0].innerText;'
+        )
+        assert "Schrodinger's Document" in title
+
+@pytest.mark.get_page('https://gotmyowndoma.in')
+def test_script_loader(execute_in_page):
+    """
+    A trivial test case that verifies Haketilo's .js files can be properly
+    loaded into a test page together with their dependencies.
+    """
+    execute_in_page(load_script('common/indexeddb.js'))
+
+    assert 'mapping' in execute_in_page('returnval(stores.map(s => s[0]));')
+
+@pytest.mark.ext_data({})
+@pytest.mark.usefixtures('webextension')
+def test_webextension(driver):
+    """
+    A trivial test case that verifies a test WebExtension created and installed
+    by the `webextension` fixture works and redirects specially-constructed URLs
+    to its test page.
+    """
+    heading = driver.execute_script(
+        'return document.getElementsByTagName("h1")[0].innerText;'
+    )
+    assert "Extension's options page for testing" in heading
+
+@pytest.mark.ext_data({
+    'extra_html': ExtraHTML(
+        'html/default_blocking_policy.html',
+        {
+            'html/default_blocking_policy.js':
+            'document.body.innerHTML = `ski-ba-bop-ba ${typeof by_id}`;'
+        }
+    ),
+    'navigate_to': 'html/default_blocking_policy.html'
+})
+@pytest.mark.usefixtures('webextension')
+def test_extra_html(driver):
+    """
+    A trivial test case of the facility for loading the Haketilo's HTML files
+    into test WebExtension for unit-testing.
+    """
+    assert driver.execute_script('return document.body.innerText') == \
+        'ski-ba-bop-ba function'