diff --git a/src/repository/mod.rs b/src/repository/mod.rs
index 863fa7b..357e92a 100644
--- a/src/repository/mod.rs
+++ b/src/repository/mod.rs
@@ -172,7 +172,7 @@ impl<'a> Repository<'a> {
 #[cfg(test)]
 mod must {
     use super::Repository;
-    use crate::test::source::TempSource;
+    use crate::test::source::TestSource;
     use proptest::prelude::*;
     use tempfile::tempdir;
 
@@ -180,7 +180,7 @@ mod must {
 
         #[test]
         fn have_size_equal_to_sum_of_sizes_of_backed_up_files(file_size1 in 0u64..128, file_size2 in 0u64..128) {
-            let source = TempSource::new().unwrap();
+            let source = TestSource::new().unwrap();
             let repository_path = tempdir().unwrap().into_path();
             Repository::init(&repository_path).unwrap();
 
diff --git a/src/test/assertions.rs b/src/test/assertions.rs
index e043313..1350bb5 100644
--- a/src/test/assertions.rs
+++ b/src/test/assertions.rs
@@ -5,7 +5,7 @@ use std::path::Path;
 use tempfile::tempdir;
 use walkdir::WalkDir;
 
-use super::source::TempSource;
+use super::source::TestSource;
 use crate::repository::{item::RepositoryItem, ItemId, Repository};
 use crate::{backup, restore};
 use anyhow::Result;
@@ -89,7 +89,7 @@ pub fn restore_all_from_reloaded_repository(repository_path: &Path, restore_targ
 }
 
 pub fn backup_file_with_text_contents(
-    source: &TempSource,
+    source: &TestSource,
     repository_path: &Path,
     source_file_relative_path: &str,
     contents: &str,
@@ -100,7 +100,7 @@ pub fn backup_file_with_text_contents(
 }
 
 pub fn backup_file_with_byte_contents(
-    source: &TempSource,
+    source: &TestSource,
     repository_path: &Path,
     source_file_relative_path: &str,
     contents: &[u8],
diff --git a/src/test/source.rs b/src/test/source.rs
index 7eb9d35..999b195 100644
--- a/src/test/source.rs
+++ b/src/test/source.rs
@@ -7,11 +7,11 @@ use std::path::PathBuf;
 use tempfile::tempdir;
 use tempfile::TempDir;
 
-pub struct TempSource {
+pub struct TestSource {
     directory: TempDir,
 }
 
-impl TempSource {
+impl TestSource {
     pub fn new() -> Result<Self, Error> {
         Ok(Self { directory: tempdir()? })
     }
@@ -39,3 +39,22 @@ impl TempSource {
         self.directory.path().join(filename)
     }
 }
+
+#[cfg(test)]
+mod must {
+    use super::TestSource;
+    use anyhow::Result;
+
+    #[test]
+    fn leave_no_trace() -> Result<()> {
+        let path;
+        {
+            let source = TestSource::new()?;
+            source.write_random_bytes_to_file("somefile", 1)?;
+            path = source.path().to_path_buf();
+        }
+
+        assert!(!path.exists());
+        Ok(())
+    }
+}
diff --git a/tests/concurrency_tests.rs b/tests/concurrency_tests.rs
index b5e4e40..e99b958 100644
--- a/tests/concurrency_tests.rs
+++ b/tests/concurrency_tests.rs
@@ -3,7 +3,7 @@ use std::path::Path;
 
 use anyhow::Result;
 use bakare::repository::Repository;
-use bakare::test::{assertions::*, source::TempSource};
+use bakare::test::{assertions::*, source::TestSource};
 use bakare::{backup, restore};
 use nix::sys::wait::{waitpid, WaitStatus};
 use nix::unistd::{fork, ForkResult};
@@ -77,7 +77,7 @@ where
     T: AsRef<Path> + Sync,
 {
     let mut repository = Repository::open(repository_path.as_ref())?;
-    let source = TempSource::new().unwrap();
+    let source = TestSource::new().unwrap();
     let mut backup_engine = backup::Engine::new(source.path(), &mut repository)?;
     for i in 0..files_per_backup_number {
         let id = file_id(task_number, i);
diff --git a/tests/system_tests.rs b/tests/system_tests.rs
index c378128..71c5c2f 100644
--- a/tests/system_tests.rs
+++ b/tests/system_tests.rs
@@ -3,13 +3,13 @@ use tempfile::tempdir;
 use anyhow::Result;
 use bakare::backup;
 use bakare::repository::Repository;
-use bakare::test::{assertions::*, source::TempSource};
+use bakare::test::{assertions::*, source::TestSource};
 
 use proptest::prelude::*;
 
 #[test]
 fn restore_multiple_files() -> Result<()> {
-    let source = TempSource::new().unwrap();
+    let source = TestSource::new().unwrap();
 
     source.write_text_to_file("first", "some contents").unwrap();
     source.write_text_to_file("second", "some contents").unwrap();
@@ -20,7 +20,7 @@ fn restore_multiple_files() -> Result<()> {
 
 #[test]
 fn restore_files_after_reopening_repository() -> Result<()> {
-    let source = TempSource::new().unwrap();
+    let source = TestSource::new().unwrap();
     let repository_path = &tempdir().unwrap().into_path();
     let restore_target = tempdir().unwrap().into_path();
     Repository::init(repository_path)?;
@@ -38,7 +38,7 @@ fn restore_files_after_reopening_repository() -> Result<()> {
 
 #[test]
 fn restore_older_version_of_file() -> Result<()> {
-    let source = TempSource::new().unwrap();
+    let source = TestSource::new().unwrap();
     let repository_path = tempdir().unwrap().into_path();
     Repository::init(repository_path.as_path())?;
 
@@ -59,7 +59,7 @@ fn restore_older_version_of_file() -> Result<()> {
 
 #[test]
 fn newer_version_should_be_greater_than_earlier_version() -> Result<()> {
-    let source = TempSource::new().unwrap();
+    let source = TestSource::new().unwrap();
     let repository_path = tempdir().unwrap().into_path();
     Repository::init(repository_path.as_path())?;
 
@@ -84,7 +84,7 @@ fn newer_version_should_be_greater_than_earlier_version() -> Result<()> {
 proptest! {
     #[test]
     fn store_duplicated_files_just_once(contents in any::<[u8;3]>()) {
-        let source = TempSource::new().unwrap();
+        let source = TestSource::new().unwrap();
         let repository_path = &tempdir().unwrap().into_path();
         Repository::init(repository_path).unwrap();
         assert_eq!(data_weight(&repository_path).unwrap(), 0);
@@ -104,7 +104,7 @@ proptest! {
 
 #[test]
 fn restore_latest_version_by_default() -> Result<()> {
-    let source = TempSource::new().unwrap();
+    let source = TestSource::new().unwrap();
     let repository_path = &tempdir().unwrap().into_path();
     Repository::init(repository_path)?;