Testing location data with edge cases, not just happy paths
An address in a well mapped city center tells you almost nothing about how your system handles a rural route, a disputed border, or a query near the poles. Test the hard cases deliberately.
How address formats differ between countries
An address that reads perfectly naturally in one country can look completely backward, or simply wrong, structured according to another country's convention. The order in which a house number, street name, locality, region, and postal code appear is a matter of national and sometimes regional convention, not a fixed universal template, and assuming your home country's order is the natural or default one is one of the more common and avoidable mistakes in building anything that handles international addresses.
Some conventions place the house number before the street name, others place it after. Some put the postal code before the city name on the same line, others put it after, and some place it on an entirely separate line altogether. The relative ordering of city, region, and country varies as well, and a handful of countries structure addresses top-down by administrative hierarchy in a way that reads almost inverted compared to conventions built bottom-up starting from the specific building.
This matters for two very different parts of a system. Input handling, particularly free-text address fields, needs to be genuinely tolerant of format variation rather than expecting a rigid template, since real users typing addresses from their own country will naturally write them in that country's conventional order, not in whatever order your form was designed around. Output formatting, displaying a returned address back to a user, ideally should respect the destination country's own convention rather than always rendering every address in one fixed house-first or postcode-first layout regardless of where it is actually located, since a locally formatted address reads as natural while a foreign-formatted one reads as noticeably off, even when every underlying component is correct.
Geocoding itself is generally more resilient to component order than a naive parser might be, particularly when it treats the input as a whole string to match against known reference data rather than expecting components in a strict predetermined sequence. That said, testing your address handling specifically with correctly formatted examples from a range of countries, not just reordered versions of your home country's format, will reveal gaps in your own validation and display logic well before international users encounter them directly.
If you are building address input or display for an international audience, it is worth deliberately testing against a handful of countries with meaningfully different conventions from your own, rather than assuming a single template generalizes. Our forward geocoding endpoint is designed to be tolerant of these variations in the input itself, but your own surrounding form validation and address display logic is worth checking independently against the same variety.