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diff --git a/test/haketilo_test/unit/test_item_preview.py b/test/haketilo_test/unit/test_item_preview.py
new file mode 100644
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+++ b/test/haketilo_test/unit/test_item_preview.py
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+# SPDX-License-Identifier: CC0-1.0
+
+"""
+Haketilo unit tests - displaying resources and mappings details
+"""
+
+# 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
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.common.exceptions import NoSuchWindowException
+
+from ..extension_crafting import ExtraHTML
+from ..script_loader import load_script
+from .utils import *
+
+@pytest.mark.ext_data({
+    'extra_html': ExtraHTML('html/item_preview.html', {}),
+    'navigate_to': 'html/item_preview.html'
+})
+@pytest.mark.usefixtures('webextension')
+def test_resource_preview(driver, execute_in_page):
+    """
+    A test case of the resource preview display function.
+    """
+    execute_in_page(load_script('html/item_preview.js'))
+
+    sample_resource = make_sample_resource()
+
+    preview_div = execute_in_page(
+        '''
+        let preview_object = resource_preview(arguments[0]);
+        document.body.append(preview_object.main_div);
+        returnval(preview_object.main_div);
+        ''',
+        sample_resource)
+    text = preview_div.text
+
+    assert '...' not in text
+
+    for string in [
+            *filter(lambda v: type(v) is str, sample_resource.values()),
+            *[rr['identifier'] for rr in sample_resource['dependencies']],
+            *[c['file'] for k in ('source_copyright', 'scripts')
+              for c in sample_resource[k]],
+            item_version_string(sample_resource, True)
+    ]:
+        assert string in text
+
+    sample_resource['identifier'] = 'hellopear'
+    sample_resource['long_name'] = 'Hello Pear'
+    sample_resource['description'] = 'greets a pear'
+    sample_resource['dependencies'] = [{'identifier': 'hello-msg'}]
+    for key in ('scripts', 'source_copyright'):
+        for file_ref in sample_resource[key]:
+            file_ref['file'] = file_ref['file'].replace('.', '_')
+
+    preview_div = execute_in_page(
+        '''
+        returnval(resource_preview(arguments[0], preview_object).main_div);
+        ''',
+        sample_resource)
+    text = preview_div.text
+
+    for string in ['...', 'pple', 'hello-message', 'report.spdx',
+                   'LICENSES/CC0-1.0.txt', 'hello.js', 'bye.js']:
+        assert string not in text
+
+    for string in ['hellopear', 'Hello Pear', 'hello-msg', 'greets a pear',
+                   'report_spdx', 'LICENSES/CC0-1_0_txt', 'hello_js', 'bye_js']:
+        assert string in text
+
+@pytest.mark.ext_data({
+    'extra_html': ExtraHTML('html/item_preview.html', {}),
+    'navigate_to': 'html/item_preview.html'
+})
+@pytest.mark.usefixtures('webextension')
+def test_mapping_preview(driver, execute_in_page):
+    """
+    A test case of the mapping preview display function.
+    """
+    execute_in_page(load_script('html/item_preview.js'))
+
+    sample_mapping = make_sample_mapping()
+
+    preview_div = execute_in_page(
+        '''
+        let preview_object = mapping_preview(arguments[0]);
+        document.body.append(preview_object.main_div);
+        returnval(preview_object.main_div);
+        ''',
+        sample_mapping)
+    text = preview_div.text
+
+    assert '...' not in text
+
+    for string in [
+            *filter(lambda v: type(v) is str, sample_mapping.values()),
+            *[p['identifier'] for p in sample_mapping['payloads'].values()],
+            *[c['file'] for c in sample_mapping['source_copyright']],
+            item_version_string(sample_mapping)
+    ]:
+        assert string in text
+
+    sample_mapping['identifier'] = 'example-org-bloated'
+    sample_mapping['long_name'] = 'Example.org Bloated',
+    sample_mapping['payloads'] = dict(
+        [(pat.replace('.org', '.com'), res_id)
+         for pat, res_id in sample_mapping['payloads'].items()]
+    )
+    for file_ref in sample_mapping['source_copyright']:
+        file_ref['file'] = file_ref['file'].replace('.', '_')
+
+    preview_div = execute_in_page(
+        '''
+        returnval(mapping_preview(arguments[0], preview_object).main_div);
+        ''',
+        sample_mapping)
+    text = preview_div.text
+
+    for string in ['...', 'inimal', 'example.org', 'report.spdx',
+                   'LICENSES/CC0-1.0.txt']:
+        assert string not in text
+
+    for string in ['example-org-bloated', 'Example.org Bloated', 'example.com',
+                   'report_spdx', 'LICENSES/CC0-1_0_txt']:
+        assert string in text
+
+@pytest.mark.ext_data({
+    'background_script': broker_js,
+    'extra_html': [
+        ExtraHTML('html/item_preview.html', {}),
+        ExtraHTML('html/file_preview.html', {}, wrap_into_htmldoc=False)
+    ],
+    'navigate_to': 'html/item_preview.html'
+})
+@pytest.mark.usefixtures('webextension')
+def test_file_preview_link(driver, execute_in_page):
+    """
+    A test case of <a> links created by preview functions that allow a
+    referenced file to be previewed.
+    """
+    execute_in_page(load_script('html/item_preview.js'))
+
+    sample_data = make_complete_sample_data()
+    sample_data['mapping'] = {}
+    execute_in_page('returnval(haketilodb.save_items(arguments[0]));',
+                    sample_data)
+
+    # Cause the "link" to `bye.js` to be invalid.
+    sample_resource = make_sample_resource()
+    sample_resource['scripts'][1]['sha256'] = 'dummy nonexistent hash'
+
+    execute_in_page(
+        '''
+        let resource_preview_object = resource_preview(arguments[0], undefined);
+        document.body.append(resource_preview_object.main_div);
+        ''',
+        sample_resource)
+
+    window0 = driver.window_handles[0]
+    driver.find_element_by_link_text('hello.js').click()
+
+    def blob_url_navigated(driver):
+        if len(driver.window_handles) < 2:
+            return
+        window1 = [wh for wh in driver.window_handles if wh != window0][0]
+        driver.switch_to.window(window1)
+        try:
+            return driver.current_url.startswith('blob')
+        except NoSuchWindowException:
+            pass
+
+    WebDriverWait(driver, 10).until(blob_url_navigated)
+
+    assert sample_files['hello.js']['contents'].strip() \
+        in driver.find_element_by_tag_name("pre").text
+
+    driver.close()
+    driver.switch_to.window(window0)
+
+    driver.find_element_by_link_text('bye.js').click()
+
+    def get_error_span(driver):
+        if len(driver.window_handles) < 2:
+            return
+        window1 = [wh for wh in driver.window_handles if wh != window0][0]
+        driver.switch_to.window(window1)
+        try:
+            return driver.find_element_by_id('error_msg')
+        except NoSuchWindowException:
+            pass
+
+    error_span = WebDriverWait(driver, 10).until(get_error_span)
+    assert error_span.is_displayed()
+    assert "Couldn't find file in Haketilo's internal database :(" \
+        in error_span.text