add rust tests to pipeline

.github/workflows/testing.yml

@@ -4,6 +4,12 @@ on:
   workflow_call:
 
 jobs:
+  rust:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Perform tests for rust modules
+        run: cargo test
   python:
     runs-on: ubuntu-22.04
     strategy:

rust/lib.rs

@@ -1,3 +1,5 @@
+#[cfg(test)]
+mod tests;
 use pyo3::prelude::*;
 
 /// Formats the sum of two numbers as string.
@@ -12,11 +14,3 @@ fn rust(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
     Ok(())
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!("4", "4");
-    }
-}

rust/tests/mod.rs

@@ -0,0 +1,5 @@
+#[cfg(test)]
+#[test]
+fn it_works() {
+    assert_eq!("4", "4");
+}