This test template allows to experiment with the coins and unique_coins functions.
The template calls the functions coins and unique_coins with the following arguments: one|two|three|foo=bar|hello=world. And so, calling the template with
{{Module:Params/testcases/tcoins|foo|hello|2|3|foo}}
generates
coins
|
unique_coins
|
|---|---|
| bar world two three bar |
bar world two three |