diff --git a/src/lib.rs b/src/lib.rs
index b0754c3..4e979e7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,3 +13,16 @@ mod sharry;
 pub use appstate::AppState;
 pub use cli::Cli;
 pub use error::{Error, Parameter, Result};
+
+#[cfg(test)]
+#[inline]
+pub fn check_trait<E, A>(expected: &E, actual: &A, tr: &'static str, ty: &'static str)
+where
+    E: std::fmt::Debug + PartialEq<A>,
+    A: std::fmt::Debug,
+{
+    assert_eq!(
+        expected, actual,
+        "`impl {tr} for {ty}` expected: {expected:?}, actual: {actual:?}",
+    );
+}
diff --git a/src/sharry/ids.rs b/src/sharry/ids.rs
index fc63f16..8f2324c 100644
--- a/src/sharry/ids.rs
+++ b/src/sharry/ids.rs
@@ -102,18 +102,7 @@ impl TryFrom<String> for FileID {
 #[cfg(test)]
 mod tests {
     use super::*;
-
-    #[inline]
-    fn check_trait<E, A>(expected: &E, actual: &A, tr: &'static str, ty: &'static str)
-    where
-        E: fmt::Debug + PartialEq<A>,
-        A: fmt::Debug,
-    {
-        assert_eq!(
-            expected, actual,
-            "`impl {tr} for {ty}` expected: {expected:?}, actual: {actual:?}",
-        );
-    }
+use crate::check_trait;
 
     #[test]
     fn basic_traits_working() {