<blockquote>
<p>Nice tests. Do you mind adding them as an additional test to osm2pgsql directly with this PR? You can use <code>tests/test-output-pgsql-z_order.cpp</code> as an example.</p>
</blockquote>
<p>I've added some tests too. I didn't see an existing way to test for null integer responses, so I used string comparison with an empty string instead.</p>
<p>Let's see how the CI gets on!</p>

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