diff --git a/tslib/storage/test/generate_assets.py b/tslib/storage/test/generate_assets.py
index e4ee9ada..48e08a64 100644
--- a/tslib/storage/test/generate_assets.py
+++ b/tslib/storage/test/generate_assets.py
@@ -87,12 +87,13 @@ if __name__ == "__main__":
     ]:
         create_optuna_storage(storage)
 
-    # Add a broken line to the random position in the journal.log to test error handling
+    # Make a file including a broken line to the random position to test error handling
+    shutil.copyfile(os.path.join(BASE_DIR, "journal.log"), os.path.join(BASE_DIR, "journal-broken.log"))
     broken_line = (
         '{"op_code": ..., "worker_id": "0000", "study_id": 0,'
         '"datetime_start": "2024-04-01T12:00:00.000000"}\n'
     )
-    with open(os.path.join(BASE_DIR, "journal.log"), "r+") as f:
+    with open(os.path.join(BASE_DIR, "journal-broken.log"), "r+") as f:
         lines = f.readlines()
         lines.insert(random.randint(0, len(lines)), broken_line)
         f.truncate(0)
diff --git a/tslib/storage/test/journal.test.mjs b/tslib/storage/test/journal.test.mjs
index 130dba74..42e07133 100644
--- a/tslib/storage/test/journal.test.mjs
+++ b/tslib/storage/test/journal.test.mjs
@@ -15,7 +15,6 @@ describe("Test Journal File Storage", async () => {
   const studies = await Promise.all(
     studySummaries.map((_summary, index) => storage.getStudy(index))
   )
-  const errors = storage.getErrors()
 
   it("Check the study including Infinities", () => {
     const study = studies.find((s) => s.study_name === "single-inf")
@@ -38,7 +37,14 @@ describe("Test Journal File Storage", async () => {
     }
   })
 
-  it("Check the parsing errors", () => {
+  it("Check the parsing errors", async () => {
+    const blob = await openAsBlob(
+      path.resolve(".", "test", "asset", "journal-broken.log")
+    )
+    const buf = await blob.arrayBuffer()
+    const storage = new mut.JournalFileStorage(buf)
+    const errors = storage.getErrors()
+
     assert.strictEqual(errors.length, 1)
     assert.strictEqual(
       errors[0].message,