[wip] unit tests

- re-added redundant `tests` submodules for good form

src/test_util/mock_ids.rs

@@ -109,8 +109,13 @@ impl From<bool> for FileID {
     }
 }
 
-#[test]
-fn true_makes_valids() {
+// technically redundant, but kept for refactoring purposes
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn true_makes_valids() {
         let uri = Uri::from(true);
         let alias_id = AliasID::from(true);
         let share_id = ShareID::from(true);
@@ -119,10 +124,10 @@ fn true_makes_valids() {
         assert!((&uri, &alias_id).check().is_ok());
         assert!(share_id.check().is_ok());
         assert!((&share_id, &file_id).check().is_ok());
-}
+    }
 
-#[test]
-fn default_is_valid() {
+    #[test]
+    fn default_is_valid() {
         let uri = Uri::default();
         let alias_id = AliasID::from(true); // no `impl Default`
         let share_id = ShareID::default();
@@ -131,10 +136,10 @@ fn default_is_valid() {
         assert!((&uri, &alias_id).check().is_ok());
         assert!(share_id.check().is_ok());
         assert!((&share_id, &file_id).check().is_ok());
-}
+    }
 
-#[test]
-fn false_makes_invalids() {
+    #[test]
+    fn false_makes_invalids() {
         use crate::Parameter;
 
         fn test_check(value: impl CheckID, callback: impl FnOnce(&Parameter) -> bool) {
@@ -173,4 +178,5 @@ fn false_makes_invalids() {
         test_check((&share_id_i, &file_id_i), is_share_id_i);
         test_check((&share_id_i, &file_id), is_share_id_i);
         test_check((&share_id, &file_id_i), is_file_id_i);
+    }
 }

src/test_util/mod.rs

@@ -29,8 +29,14 @@ pub fn create_file(data: &[u8]) -> NamedTempFile {
     tmp
 }
 
-#[test]
-#[should_panic = "`impl foo for bar` expected: 1, actual: 0"]
-fn make_check_trait_panic() {
+// technically redundant, but kept for refactoring purposes
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    #[should_panic = "`impl foo for bar` expected: 1, actual: 0"]
+    fn make_check_trait_panic() {
         check_trait(0, 1, "foo", "bar");
+    }
 }