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diff --git a/test/haketilo_test/unit/test_payload_create.py b/test/haketilo_test/unit/test_payload_create.py
new file mode 100644
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+++ b/test/haketilo_test/unit/test_payload_create.py
@@ -0,0 +1,248 @@
+# SPDX-License-Identifier: CC0-1.0
+
+"""
+Haketilo unit tests - using a form to create simple site payload
+"""
+
+# 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 re
+from hashlib import sha256
+
+from selenium.webdriver.support.ui import WebDriverWait
+
+from ..extension_crafting import ExtraHTML
+from ..script_loader import load_script
+from .utils import *
+
+uuidv4_re = re.compile(
+    r'^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$',
+    re.IGNORECASE
+)
+
+sample_patterns = '''
+http://example.com/***
+
+https://*.example.org/**'''
+
+sample_form_data = {
+    'identifier':  'someid',
+    'long_name':   'Some Name',
+    'description': 'blah blah blah',
+    'patterns':    sample_patterns,
+    'script':      sample_files['hello.js']['contents']
+}
+
+def fill_form_with_sample_data(execute_in_page, sample_data_override={},
+                               form_ctx='form_ctx'):
+    form_data = sample_form_data.copy()
+    form_data.update(sample_data_override)
+    execute_in_page(
+        f'''
+        for (const [key, value] of Object.entries(arguments[0]))
+            {form_ctx}[key].value = value;
+        ''',
+        form_data)
+    return form_data
+
+cleared_form_inputs = {
+    'identifier':  '',
+    'long_name':   '',
+    'description': '',
+    'patterns':    'https://example.com/***',
+    'script':      'console.log("Hello, World!");'
+}
+def assert_form_contents(execute_in_page, inputs=cleared_form_inputs):
+    inputs_keys = [*inputs.keys()]
+    values = execute_in_page(
+        'returnval(arguments[0].map(i => form_ctx[i].value));',
+        inputs_keys
+    )
+    for key, value in zip(inputs_keys, values):
+        assert inputs[key] == value
+
+@pytest.mark.ext_data({
+    'background_script': broker_js,
+    'extra_html': ExtraHTML('html/payload_create.html', {}),
+    'navigate_to': 'html/payload_create.html'
+})
+@pytest.mark.usefixtures('webextension')
+def test_payload_create_normal_usage(driver, execute_in_page):
+    """
+    A test case of normal usage of simple payload creation form.
+    """
+    execute_in_page(load_script('html/payload_create.js'))
+
+    create_but, form_container, dialog_container = execute_in_page(
+        '''
+        const form_ctx = payload_create_form();
+        document.body.append(form_ctx.main_div);
+        returnval([form_ctx.create_but, form_ctx.form_container,
+                   form_ctx.dialog_container]);
+        ''')
+
+    assert patterns_doc_url == \
+        driver.find_element_by_link_text('URL patterns').get_attribute('href')
+
+    assert form_container.is_displayed()
+    assert not dialog_container.is_displayed()
+
+    assert_form_contents(execute_in_page)
+
+    form_data = fill_form_with_sample_data(execute_in_page)
+
+    create_but.click()
+
+    assert not form_container.is_displayed()
+    assert dialog_container.is_displayed()
+
+    def success_reported(driver):
+        return 'Successfully saved payload' in dialog_container.text
+
+    WebDriverWait(driver, 10).until(success_reported)
+    execute_in_page('form_ctx.dialog_ctx.ok_but.click();')
+
+    assert form_container.is_displayed()
+    assert not dialog_container.is_displayed()
+
+    def assert_db_contents():
+        db_contents = get_db_contents(execute_in_page)
+
+        assert uuidv4_re.match(db_contents['resource'][0]['uuid'])
+
+        localid = f'local-{form_data["identifier"]}'
+        long_name = form_data['long_name'] or form_data['identifier']
+        payloads = dict([(pat, {'identifier': localid})
+                         for pat in form_data['patterns'].split('\n') if pat])
+
+        assert db_contents['resource'] == [{
+      	    'source_name':      localid,
+	    'source_copyright': [],
+	    'type':             'resource',
+	    'identifier':       localid,
+	    'uuid':             db_contents['resource'][0]['uuid'],
+	    'version':          [1],
+	    'description':      form_data['description'],
+	    'dependencies':     [],
+            'long_name':        long_name,
+	    'scripts': [{
+                'file': 'payload.js',
+                'sha256': sha256(form_data['script'].encode()).digest().hex()
+            }]
+        }]
+
+        assert uuidv4_re.match(db_contents['mapping'][0]['uuid'])
+        assert db_contents['mapping'] == [{
+      	    'source_name':      localid,
+	    'source_copyright': [],
+	    'type':             'mapping',
+	    'identifier':       localid,
+	    'uuid':             db_contents['mapping'][0]['uuid'],
+	    'version':          [1],
+            'description':      form_data['description'],
+            'long_name':        long_name,
+            'payloads':         payloads
+        }]
+
+    assert_db_contents()
+
+    form_data = fill_form_with_sample_data(execute_in_page, {
+        'long_name':   '',
+        'description': 'bam bam bam',
+        'patterns':    'https://new.example.com/***',
+        'script':      sample_files['bye.js']['contents']
+    })
+
+    create_but.click()
+
+    for type in ('Resource', 'Mapping'):
+        def override_asked(driver):
+            return f"{type} 'local-someid' already exists. Override?" \
+                in dialog_container.text
+        WebDriverWait(driver, 10).until(override_asked)
+        execute_in_page('form_ctx.dialog_ctx.yes_but.click();')
+
+    assert_db_contents()
+
+@pytest.mark.ext_data({
+    'background_script': broker_js,
+    'extra_html': ExtraHTML('html/payload_create.html', {}),
+    'navigate_to': 'html/payload_create.html'
+})
+@pytest.mark.usefixtures('webextension')
+def test_payload_create_errors(driver, execute_in_page):
+    """
+    A test case of various error the simple payload form might show.
+    """
+    execute_in_page(load_script('html/payload_create.js'))
+
+    create_but, dialog_container = execute_in_page(
+        '''
+        const form_ctx = payload_create_form();
+        document.body.append(form_ctx.main_div);
+        returnval([form_ctx.create_but, form_ctx.dialog_container]);
+        ''')
+
+    for data_override, expected_msg in [
+            ({'identifier': ''},   "The 'identifier' field is required!"),
+            ({'identifier': ':('}, 'Identifier may only contain '),
+            ({'script':     ''},  "The 'script' field is required!"),
+            ({'patterns':   ''},   "The 'URL patterns' field is required!"),
+            ({'patterns':   ':d'}, "':d' is not a valid URL pattern. See here for more details."),
+            ({'patterns': '\n'.join(['http://example.com'] * 2)},
+             "Pattern 'http://example.com' specified multiple times!")
+    ]:
+        # Attempt creating the payload
+        form_data = fill_form_with_sample_data(execute_in_page, data_override)
+        create_but.click()
+        # Verify the error message
+        assert expected_msg in dialog_container.text
+
+        # Verify patterns documentation <a> link.
+        if expected_msg == {'patterns': ':d'}:
+            doc_link_elem = driver.find_element_by_link_text('here')
+            assert doc_link.get_attribute('href') == patterns_doc_url
+
+        # Verify the form was NOT cleared upon failed saving.
+        execute_in_page('form_ctx.dialog_ctx.ok_but.click();')
+        assert_form_contents(execute_in_page, form_data)
+
+    # Add a sample item and attempt overriding it.
+    fill_form_with_sample_data(execute_in_page)
+    create_but.click()
+    WebDriverWait(driver, 10).until(lambda _: 'Succes' in dialog_container.text)
+    execute_in_page('form_ctx.dialog_ctx.ok_but.click();')
+
+    # Verify that denying override leads to saving failure.
+    form_data = fill_form_with_sample_data(execute_in_page)
+    create_but.click()
+    WebDriverWait(driver, 10).until(lambda _: 'Overri' in dialog_container.text)
+    execute_in_page('form_ctx.dialog_ctx.no_but.click();')
+    assert 'Failed to save payload :(' in dialog_container.text
+    execute_in_page('form_ctx.dialog_ctx.ok_but.click();')
+    assert_form_contents(execute_in_page, form_data)
+
+    # Verify that IndexedDB errors get caught and reported as saving failures.
+    execute_in_page('haketilodb.get = async () => {throw "someerror";}')
+    form_data = fill_form_with_sample_data(execute_in_page, {'identifier': 'o'})
+    create_but.click()
+    WebDriverWait(driver, 10).until(lambda _: 'Failed' in dialog_container.text)
+    execute_in_page('form_ctx.dialog_ctx.ok_but.click();')
+    assert_form_contents(execute_in_page, form_data)
+
+    # Verify that the loading message gets shown during IndexedDB operations.
+    execute_in_page('haketilodb.get = () => new Promise(cb => null);')
+    create_but.click()
+    assert 'Saving payload...' in dialog_container.text