diff --git a/Cargo.lock b/Cargo.lock
index b55e32afc..0e9165f6b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1719,8 +1719,10 @@ dependencies = [
 name = "limbo_ext_tests"
 version = "0.0.16"
 dependencies = [
+ "env_logger 0.11.6",
  "lazy_static",
  "limbo_ext",
+ "log",
  "mimalloc",
 ]
 
@@ -1895,9 +1897,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.25"
+version = "0.4.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04cbf5b083de1c7e0222a7a51dbfdba1cbe1c6ab0b15e29fff3f6c077fd9cd9f"
+checksum = "30bde2b3dc3671ae49d8e2e9f044c7c005836e7a023ee57cffa25ab82764bb9e"
 
 [[package]]
 name = "lru"
diff --git a/extensions/tests/Cargo.toml b/extensions/tests/Cargo.toml
index 84c9cbae2..aa3ba8fdb 100644
--- a/extensions/tests/Cargo.toml
+++ b/extensions/tests/Cargo.toml
@@ -13,8 +13,10 @@ crate-type = ["cdylib", "lib"]
 static= [ "limbo_ext/static" ]
 
 [dependencies]
+env_logger = "0.11.6"
 lazy_static = "1.5.0"
 limbo_ext = { workspace = true, features = ["static"] }
+log = "0.4.26"
 
 [target.'cfg(not(target_family = "wasm"))'.dependencies]
 mimalloc = { version = "0.1", default-features = false }
diff --git a/extensions/tests/src/lib.rs b/extensions/tests/src/lib.rs
index caf065ede..92e4f874f 100644
--- a/extensions/tests/src/lib.rs
+++ b/extensions/tests/src/lib.rs
@@ -12,6 +12,7 @@ use std::sync::Mutex;
 
 register_extension! {
     vtabs: { KVStoreVTab },
+    scalars: { test_scalar },
     vfs: { TestFS },
 }
 
@@ -134,7 +135,7 @@ impl VTabCursor for KVStoreCursor {
         if self.index.is_some_and(|c| c < self.rows.len()) {
             self.rows[self.index.unwrap_or(0)].0
         } else {
-            println!("rowid: -1");
+            log::error!("rowid: -1");
             -1
         }
     }
@@ -175,6 +176,8 @@ impl VfsExtension for TestFS {
     const NAME: &'static str = "testvfs";
     type File = TestFile;
     fn open_file(&self, path: &str, flags: i32, _direct: bool) -> ExtResult<Self::File> {
+        let _ = env_logger::try_init();
+        log::debug!("opening file with testing VFS: {} flags: {}", path, flags);
         let file = OpenOptions::new()
             .read(true)
             .write(true)
@@ -188,6 +191,7 @@ impl VfsExtension for TestFS {
 #[cfg(not(target_family = "wasm"))]
 impl VfsFile for TestFile {
     fn read(&mut self, buf: &mut [u8], count: usize, offset: i64) -> ExtResult<i32> {
+        log::debug!("reading file with testing VFS: bytes: {count} offset: {offset}");
         if self.file.seek(SeekFrom::Start(offset as u64)).is_err() {
             return Err(ResultCode::Error);
         }
@@ -198,6 +202,7 @@ impl VfsFile for TestFile {
     }
 
     fn write(&mut self, buf: &[u8], count: usize, offset: i64) -> ExtResult<i32> {
+        log::debug!("writing to file with testing VFS: bytes: {count} offset: {offset}");
         if self.file.seek(SeekFrom::Start(offset as u64)).is_err() {
             return Err(ResultCode::Error);
         }
@@ -208,6 +213,7 @@ impl VfsFile for TestFile {
     }
 
     fn sync(&self) -> ExtResult<()> {
+        log::debug!("syncing file with testing VFS");
         self.file.sync_all().map_err(|_| ResultCode::Error)
     }