Refactor table view HTML tests to test_table_html.py

Refs #1518

tests/utils.py

@@ -0,0 +1,24 @@
+def assert_footer_links(soup):
+    footer_links = soup.find("footer").findAll("a")
+    assert 4 == len(footer_links)
+    datasette_link, license_link, source_link, about_link = footer_links
+    assert "Datasette" == datasette_link.text.strip()
+    assert "tests/fixtures.py" == source_link.text.strip()
+    assert "Apache License 2.0" == license_link.text.strip()
+    assert "About Datasette" == about_link.text.strip()
+    assert "https://datasette.io/" == datasette_link["href"]
+    assert (
+        "https://github.com/simonw/datasette/blob/main/tests/fixtures.py"
+        == source_link["href"]
+    )
+    assert (
+        "https://github.com/simonw/datasette/blob/main/LICENSE" == license_link["href"]
+    )
+    assert "https://github.com/simonw/datasette" == about_link["href"]
+
+
+def inner_html(soup):
+    html = str(soup)
+    # This includes the parent tag - so remove that
+    inner_html = html.split(">", 1)[1].rsplit("<", 1)[0]
+    return inner_html.strip()