Use mod tests consistently

Summary: We mostly use mod tests, but not exclusively. Be consistent.

Reviewed By: JakobDegen

Differential Revision: D53388349

fbshipit-source-id: 0010ada7bc87d5c01e07d2ce199afc606b7d83b3

src/output.rs

@@ -183,7 +183,7 @@ impl SuperConsoleOutput for NonBlockingSuperConsoleOutput {
 }
 
 #[cfg(test)]
-mod test {
+mod tests {
     use crossbeam_channel::Receiver;
 
     use super::*;