diff --git a/src/file/chunk.rs b/src/file/chunk.rs
index d3025b8..72cd32d 100644
--- a/src/file/chunk.rs
+++ b/src/file/chunk.rs
@@ -55,11 +55,33 @@ impl<'t> Chunk<'t> {
 
 #[cfg(test)]
 mod tests {
-    // use super::*;
+    use crate::test_util::{
+        check_trait,
+        data::{DATA_LENGTHS_BAD, cases_with},
+    };
 
-    // #[test]
-    // fn basic_tests() {
-    //     let mut foo = [0u8; 10];
-    //     let fid = sharry::FileID("fid".to_string());
-    // }
+    use super::*;
+
+    #[test]
+    fn basic_tests() {
+        for (data, len, mock_offset) in cases_with(DATA_LENGTHS_BAD) {
+            let fid = sharry::FileID::default();
+            let chunk = Chunk::new_direct(fid, mock_offset, data);
+
+            let repr = format!("{chunk:?}");
+            let repr_expect = format!(
+                "Chunk {{ file_id: {:?}, offset: {:?}, data.len(): {:?}, .. }}",
+                chunk.file_id,
+                chunk.offset,
+                chunk.data.len()
+            );
+            check_trait(repr, repr_expect, "Debug", "Chunk");
+
+            assert_eq!(chunk.get_file_id().to_string(), "fid");
+            assert_eq!(chunk.get_offset(), mock_offset);
+            assert_eq!(chunk.get_data(), data);
+            assert_eq!(chunk.get_length(), len);
+            assert_eq!(chunk.get_behind(), mock_offset + len);
+        }
+    }
 }
diff --git a/src/sharry/ids.rs b/src/sharry/ids.rs
index 36ed596..24412e0 100644
--- a/src/sharry/ids.rs
+++ b/src/sharry/ids.rs
@@ -28,9 +28,11 @@ impl From<String> for AliasID {
 ///
 /// - impl `From<String>` and `Clone` as this is just a String
 /// - impl `serde` for cachefile handling
+/// - impl `Default` while testing for value generation
 /// - impl `Display` for formatting compatibility
 #[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct ShareID(pub(super) String);
+#[cfg_attr(test, derive(Default))]
+pub struct ShareID(String);
 
 impl fmt::Display for ShareID {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -48,10 +50,20 @@ impl From<String> for ShareID {
 ///
 /// - impl `Clone` as this is just a String
 /// - impl `serde` for cachefile handling
+/// - impl `Default` while testing for value generation
 /// - impl `Display` for formatting compatibility
 /// - impl `TryFrom<String>` for extracting from matching a "PATCH" uri
 #[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct FileID(pub(super) String);
+#[cfg_attr(test, derive(Default))]
+pub struct FileID(String);
+
+impl FileID {
+    #[cfg(test)]
+    /// create a new `FileID` for testing purposes
+    pub fn new_test(value: impl Into<String>) -> Self {
+        Self(value.into())
+    }
+}
 
 impl fmt::Display for FileID {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -133,6 +145,9 @@ mod tests {
                 // check FileID
                 let fid = FileID(input.to_string());
                 check_trait(fid.to_string(), input, "Display", "FileID");
+
+                let fid_test = FileID::new_test(input);
+                assert_eq!(fid_test.0, fid.0);
             }
         }
     }
diff --git a/src/sharry/uri.rs b/src/sharry/uri.rs
index 7745264..16dd27d 100644
--- a/src/sharry/uri.rs
+++ b/src/sharry/uri.rs
@@ -11,6 +11,7 @@ use serde::{Deserialize, Serialize};
 /// - impl `Display` for formatting compatibility
 /// - impl `AsRef<[u8]>` for hashing with `blake2b_simd`
 #[derive(Debug, Clone, Serialize, Deserialize)]
+#[cfg_attr(test, derive(Default))]
 pub struct Uri(String);
 
 impl fmt::Display for Uri {
@@ -182,7 +183,7 @@ mod tests {
             ("12345", "/api/v2/12345"),
         ];
 
-        let uri = Uri("".to_string());
+        let uri = Uri::default();
         for (path, expected) in cases {
             assert_eq!(&expected, &uri.endpoint(format_args!("{path}")));
         }
@@ -190,9 +191,9 @@ mod tests {
 
     #[test]
     fn test_pub_endpoints() {
-        let uri = Uri("".to_string());
-        let share_id = ShareID("sid".to_string());
-        let file_id = FileID("fid".to_string());
+        let uri = Uri::default();
+        let share_id = ShareID::default();
+        let file_id = FileID::default();
 
         assert_eq!("/api/v2/alias/upload/new", uri.share_create());
         assert_eq!("/api/v2/alias/mail/notify/sid", uri.share_notify(&share_id));