diff --git a/src/test_utilities/bad_file.rs b/src/test_utilities/bad_file.rs
index ab596976b..c4fae5fa1 100644
--- a/src/test_utilities/bad_file.rs
+++ b/src/test_utilities/bad_file.rs
@@ -1,8 +1,10 @@
-struct BadFile {
-    read_result: std::io::Result<usize>,
-    seek_result: std::io::Result<u64>,
-    write_result: std::io::Result<usize>,
-    flush_result: std::io::Result<()>,
+pub(crate) struct BadFile {
+    pub(crate) read_result: std::io::Result<usize>,
+    pub(crate) read_exact_result: std::io::Result<()>,
+    pub(crate) seek_result: std::io::Result<u64>,
+    pub(crate) write_result: std::io::Result<usize>,
+    pub(crate) write_all_result: std::io::Result<()>,
+    pub(crate) flush_result: std::io::Result<()>,
 }
 
 impl std::io::Read for BadFile {
@@ -12,6 +14,13 @@ impl std::io::Read for BadFile {
             Err(e) => Err(std::io::Error::from(e.kind())),
         }
     }
+
+    fn read_exact(&mut self, _buf: &mut [u8]) -> std::io::Result<()> {
+        match &self.read_exact_result {
+            Ok(_) => Ok(()),
+            Err(e) => Err(std::io::Error::from(e.kind())),
+        }
+    }
 }
 
 impl std::io::Seek for BadFile {
@@ -31,6 +40,13 @@ impl std::io::Write for BadFile {
         }
     }
 
+    fn write_all(&mut self, mut _buf: &[u8]) -> std::io::Result<()> {
+        match &self.write_all_result {
+            Ok(_) => Ok(()),
+            Err(e) => Err(std::io::Error::from(e.kind())),
+        }
+    }
+
     fn flush(&mut self) -> std::io::Result<()> {
         match &self.flush_result {
             Ok(_) => Ok(()),
@@ -39,6 +55,19 @@ impl std::io::Write for BadFile {
     }
 }
 
+impl Default for BadFile {
+    fn default() -> Self {
+        Self {
+            read_result: Ok(0),
+            read_exact_result: Ok(()),
+            seek_result: Ok(0),
+            write_result: Ok(0),
+            write_all_result: Ok(()),
+            flush_result: Ok(()),
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use std::io::Read;
@@ -47,14 +76,14 @@ mod tests {
 
     use super::*;
 
+    #[test]
+    fn default_constructed() {
+        let _file = BadFile::default();
+    }
+
     #[test]
     fn flush_ok() {
-        let mut file = BadFile {
-            read_result: Ok(0),
-            seek_result: Ok(0),
-            write_result: Ok(0),
-            flush_result: Ok(()),
-        };
+        let mut file = BadFile::default();
 
         assert!(file.flush().is_ok());
     }
@@ -62,24 +91,36 @@ mod tests {
     #[test]
     fn flush_err() {
         let mut file = BadFile {
-            read_result: Ok(0),
-            seek_result: Ok(0),
-            write_result: Ok(0),
             flush_result: Err(std::io::Error::from(std::io::ErrorKind::Other)),
+            ..Default::default()
         };
 
         assert!(file.flush().is_err());
     }
 
     #[test]
-    fn read_ok() {
+    fn read_exact_ok() {
+        let mut file = BadFile::default();
+
+        let mut buf = vec![0_u8; 0];
+        assert!(file.read_exact(&mut buf).is_ok());
+    }
+
+    #[test]
+    fn read_exact_err() {
         let mut file = BadFile {
-            read_result: Ok(0),
-            seek_result: Ok(0),
-            write_result: Ok(0),
-            flush_result: Ok(()),
+            read_exact_result: Err(std::io::Error::from(std::io::ErrorKind::Other)),
+            ..Default::default()
         };
 
+        let mut buf = vec![0_u8; 0];
+        assert!(file.read_exact(&mut buf).is_err());
+    }
+
+    #[test]
+    fn read_ok() {
+        let mut file = BadFile::default();
+
         let mut buf = vec![0_u8; 0];
         assert!(file.read(&mut buf).is_ok());
     }
@@ -88,9 +129,7 @@ mod tests {
     fn read_err() {
         let mut file = BadFile {
             read_result: Err(std::io::Error::from(std::io::ErrorKind::Other)),
-            seek_result: Ok(0),
-            write_result: Ok(0),
-            flush_result: Ok(()),
+            ..Default::default()
         };
 
         let mut buf = vec![0_u8; 0];
@@ -99,12 +138,7 @@ mod tests {
 
     #[test]
     fn seek_ok() {
-        let mut file = BadFile {
-            read_result: Ok(0),
-            seek_result: Ok(0),
-            write_result: Ok(0),
-            flush_result: Ok(()),
-        };
+        let mut file = BadFile::default();
 
         assert!(file.seek(std::io::SeekFrom::Current(0)).is_ok());
     }
@@ -112,24 +146,36 @@ mod tests {
     #[test]
     fn seek_err() {
         let mut file = BadFile {
-            read_result: Ok(0),
             seek_result: Err(std::io::Error::from(std::io::ErrorKind::Other)),
-            write_result: Ok(0),
-            flush_result: Ok(()),
+            ..Default::default()
         };
 
         assert!(file.seek(std::io::SeekFrom::Current(0)).is_err());
     }
 
     #[test]
-    fn write_ok() {
+    fn write_all_ok() {
+        let mut file = BadFile::default();
+
+        let buf = vec![0_u8; 0];
+        assert!(file.write_all(&buf).is_ok());
+    }
+
+    #[test]
+    fn write_all_err() {
         let mut file = BadFile {
-            read_result: Ok(0),
-            seek_result: Ok(0),
-            write_result: Ok(0),
-            flush_result: Ok(()),
+            write_all_result: Err(std::io::Error::from(std::io::ErrorKind::Other)),
+            ..Default::default()
         };
 
+        let buf = vec![0_u8; 0];
+        assert!(file.write_all(&buf).is_err());
+    }
+
+    #[test]
+    fn write_ok() {
+        let mut file = BadFile::default();
+
         let buf = vec![0_u8; 0];
         assert!(file.write(&buf).is_ok());
     }
@@ -137,10 +183,8 @@ mod tests {
     #[test]
     fn write_err() {
         let mut file = BadFile {
-            read_result: Ok(0),
-            seek_result: Ok(0),
             write_result: Err(std::io::Error::from(std::io::ErrorKind::Other)),
-            flush_result: Ok(()),
+            ..Default::default()
         };
 
         let buf = vec![0_u8; 0];