Add test for modules1 to prevent passing by commenting out main

exercises/10_modules/modules1.rs

@@ -14,3 +14,13 @@ mod sausage_factory {
 fn main() {
     sausage_factory::make_sausage();
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_make_sausage() {
+        sausage_factory::make_sausage();
+    }
+}

solutions/10_modules/modules1.rs

@@ -13,3 +13,13 @@ mod sausage_factory {
 fn main() {
     sausage_factory::make_sausage();
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_make_sausage() {
+        sausage_factory::make_sausage();
+    }
+}