Emit a compile error when tests are build without the testing feature enabled
+#[cfg(not(feature = "testing"))]
+compile_error!(
+ "please run tests using the \"testing\" feature, \
+ which enables additional checks at runtime and \
+ causes more race conditions to jump out by \
+ inserting delays in concurrent code."
+);
+
pub fn setup_logger() {
use std::io::Write;
