diff --git a/lib/src/source.rs b/lib/src/source.rs
index 61f0209..79cfd0d 100644
--- a/lib/src/source.rs
+++ b/lib/src/source.rs
@@ -218,37 +218,12 @@ pub mod reader_sync {
     }
     #[cfg(test)]
     mod test {
-        use crate::source::SourceQuestion;
-
+        use super::super::test::sample_batch;
         use super::*;
         use std::fs;
         use std::{io::Write, iter, path::Path};
         use tempfile::tempdir;
 
-        use super::SourceQuestionsBatch;
-
-        fn sample_batch() -> SourceQuestionsBatch {
-            SourceQuestionsBatch {
-                description: "Тестовый".into(),
-                date: "00-000-2000".into(),
-                questions: vec![
-                    SourceQuestion {
-                        id: "Вопрос 1".into(),
-                        description: "Сколько будет (2 * 2 * 2 + 2) * 2 * 2 + 2".into(),
-                        answer: "42".into(),
-                        ..Default::default()
-                    },
-                    SourceQuestion {
-                        id: "Вопрос 2".into(),
-                        description: "Зимой и летом одним цветом".into(),
-                        answer: "ёлка".into(),
-                        ..Default::default()
-                    },
-                ],
-                ..Default::default()
-            }
-        }
-
         fn write_sample_zip<P>(path: P)
         where
             P: AsRef<Path>,
@@ -282,7 +257,7 @@ pub mod reader_sync {
             let mut source = zip_file.source_questions();
             assert_eq!(source.len(), 1);
 
-            let actual = source.nth(0).expect("get batch");
+            let actual = source.next().expect("get batch");
             assert_eq!(actual.0, "test.json");
             assert_eq!(actual.1.expect("parse batch"), expected_batch);
         }
@@ -430,6 +405,7 @@ pub mod reader_async {
     mod test {
         use crate::source::SourceQuestion;
 
+        use super::super::test::sample_batch;
         use super::*;
         use async_zip::{base::write::ZipFileWriter, ZipEntryBuilder};
         use core::fmt::Debug;
@@ -438,28 +414,6 @@ pub mod reader_async {
         use tempfile::tempdir;
         use tokio::fs;
 
-        fn sample_batch() -> SourceQuestionsBatch {
-            SourceQuestionsBatch {
-                description: "Тестовый".into(),
-                date: "00-000-2000".into(),
-                questions: vec![
-                    SourceQuestion {
-                        id: "Вопрос 1".into(),
-                        description: "Сколько будет (2 * 2 * 2 + 2) * 2 * 2 + 2".into(),
-                        answer: "42".into(),
-                        ..Default::default()
-                    },
-                    SourceQuestion {
-                        id: "Вопрос 2".into(),
-                        description: "Зимой и летом одним цветом".into(),
-                        answer: "ёлка".into(),
-                        ..Default::default()
-                    },
-                ],
-                ..Default::default()
-            }
-        }
-
         async fn write_sample_zip<P>(path: P)
         where
             P: AsRef<Path>,
@@ -547,9 +501,8 @@ mod test {
     use insta::assert_yaml_snapshot;
     use serde_json::json;
 
-    #[test]
-    fn test_batch_ser() {
-        let batch = SourceQuestionsBatch {
+    pub fn sample_batch() -> SourceQuestionsBatch {
+        SourceQuestionsBatch {
             description: "Тестовый".into(),
             date: "00-000-2000".into(),
             questions: vec![
@@ -567,7 +520,12 @@ mod test {
                 },
             ],
             ..Default::default()
-        };
+        }
+    }
+
+    #[test]
+    fn test_batch_ser() {
+        let batch = sample_batch();
 
         assert_yaml_snapshot!(batch, @r#"
             ---