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diff --git a/test/unit/test_indexeddb.py b/test/unit/test_indexeddb.py
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+# SPDX-License-Identifier: CC0-1.0
+
+"""
+Haketilo unit tests - IndexedDB access
+"""
+
+# This file is part of Haketilo
+#
+# Copyright (C) 2021, 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
+from hashlib import sha256
+
+from ..script_loader import load_script
+
+@pytest.fixture(scope="session")
+def indexeddb_code():
+    yield load_script('common/indexeddb.js', ['common'])
+
+def sample_file(contents):
+    return {
+        'sha256': sha256(contents.encode()).digest().hex(),
+        contents: contents
+    }
+
+sample_files = {
+    'report.spdx':              sample_file('<!-- dummy report -->'),
+    'LICENSES/somelicense.txt': sample_file('Permission is granted...'),
+    'hello.js':                 sample_file('console.log("hello!");\n'),
+    'bye.js':                   sample_file('console.log("bye!");\n'),
+    'README.md':                sample_file('# Python Frobnicator\n...')
+}
+
+sample_files_sha256 = \
+    dict([[file['sha256'], file] for file in sample_files.values()])
+
+def file_ref(file_name):
+    return {'file': file_name, 'sha256': sample_files[file_name]['sha256']}
+
+def test_save_item(execute_in_page, indexeddb_code):
+    """
+    indexeddb.js facilitates operating on Haketilo's internal database.
+    Verify database operations work properly.
+    """
+    execute_in_page(indexeddb_code, page='https://gotmyowndoma.in')
+    # Don't use Haketilo's default initial data.
+    execute_in_page(
+        '''{
+        const _get_db = haketilodb.get;
+        get_db = () => _get_db({});
+        haketilodb.get = get_db;
+        }'''
+    )
+
+    # Start with no database.
+    execute_in_page(
+        '''{
+        async function delete_db() {
+            let resolve;
+            const result = new Promise(_resolve => resolve = _resolve);
+            const request = indexedDB.deleteDatabase("haketilo");
+            [request.onsuccess, request.onerror] = [resolve, resolve];
+            await result;
+        }
+
+        returnval(delete_db());
+        }'''
+    )
+
+    # Facilitate retrieving all IndexedDB contents.
+    execute_in_page(
+        '''
+        async function get_database_contents(promise=Promise.resolve())
+        {
+            if (promise)
+                await promise;
+
+            const db = await haketilodb.get();
+
+            const transaction = db.transaction(db.objectStoreNames);
+            const store_names_reqs = [...db.objectStoreNames]
+                .map(sn => [sn, transaction.objectStore(sn).getAll()])
+
+            const promises = store_names_reqs
+                .map(([_, req]) => wait_request(req));
+            await Promise.all(promises);
+
+            const result = {};
+            store_names_reqs.forEach(([sn, req]) => result[sn] = req.result);
+            return result;
+        }
+        ''')
+
+    # Sample resource definition. It'd normally contain more fields but here
+    # we use a simplified version.
+    sample_item = {
+        'source_copyright': [
+            file_ref('report.spdx'),
+            file_ref('LICENSES/somelicense.txt')
+        ],
+        'type': 'resource',
+        'identifier': 'helloapple',
+        'scripts': [file_ref('hello.js'), file_ref('bye.js')],
+        'type': 'resource'
+    }
+    next(iter(sample_item['source_copyright']))['ugly_extra_property'] = True
+
+    database_contents = execute_in_page(
+        '''{
+        const prom = haketilodb.get().then(db => save_item(...arguments, db));
+        returnval(get_database_contents(prom));
+        }''',
+        sample_item, sample_files_sha256)
+    assert len(database_contents['files']) == 4
+    assert all([sample_files_sha256[file['sha256']] == file['contents']
+                for file in database_contents['files']])
+    assert all([len(file) == 2 for file in database_contents['files']])
+
+    assert len(database_contents['file_uses']) == 4
+    assert all([uses['uses'] == 1 for uses in database_contents['file_uses']])
+    assert set([uses['sha256'] for uses in database_contents['file_uses']]) \
+        == set([file['sha256'] for file in database_contents['files']])
+
+    assert database_contents['mappings'] == []
+    assert database_contents['resources'] == [sample_item]