diff --git a/src/jpeg.rs b/src/jpeg.rs
index d5fc36e..26de775 100644
--- a/src/jpeg.rs
+++ b/src/jpeg.rs
@@ -108,7 +108,6 @@ pub fn is_jpeg(buf: &[u8]) -> bool {
 
 #[cfg(test)]
 mod tests {
-    use std::io::Cursor;
     use super::*;
 
     #[test]
@@ -122,12 +121,12 @@ mod tests {
             b"\xff\xd8\xff\xe1\x00\x08\x03\x04",
         ];
         for &data in sets {
-            assert_err_pat!(get_exif_attr(&mut Cursor::new(data)),
+            assert_err_pat!(get_exif_attr(&mut &data[..]),
                             Error::InvalidFormat("Broken JPEG file"));
         }
 
         let mut data = b"\xff\xd8\xff\xe1\x00\x08Exif\0\0".to_vec();
-        get_exif_attr(&mut Cursor::new(&data)).unwrap();
+        get_exif_attr(&mut &data[..]).unwrap();
         while let Some(_) = data.pop() {
             get_exif_attr(&mut &data[..]).unwrap_err();
         }
@@ -136,26 +135,26 @@ mod tests {
     #[test]
     fn no_exif() {
         let data = b"\xff\xd8\xff\xd9";
-        assert_err_pat!(get_exif_attr(&mut Cursor::new(data)),
+        assert_err_pat!(get_exif_attr(&mut &data[..]),
                         Error::NotFound(_));
     }
 
     #[test]
     fn out_of_sync() {
         let data = b"\xff\xd8\x01\x02\x03\xff\x00\xff\xd9";
-        assert_err_pat!(get_exif_attr(&mut Cursor::new(data)),
+        assert_err_pat!(get_exif_attr(&mut &data[..]),
                         Error::NotFound(_));
     }
 
     #[test]
     fn empty() {
         let data = b"\xff\xd8\xff\xe1\x00\x08Exif\0\0\xff\xd9";
-        assert_ok!(get_exif_attr(&mut Cursor::new(data)), []);
+        assert_ok!(get_exif_attr(&mut &data[..]), []);
     }
 
     #[test]
     fn non_empty() {
         let data = b"\xff\xd8\xff\xe1\x00\x0aExif\0\0\xbe\xad\xff\xd9";
-        assert_ok!(get_exif_attr(&mut Cursor::new(data)), [0xbe, 0xad]);
+        assert_ok!(get_exif_attr(&mut &data[..]), [0xbe, 0xad]);
     }
 }
diff --git a/src/png.rs b/src/png.rs
index 2657eb4..4e2557e 100644
--- a/src/png.rs
+++ b/src/png.rs
@@ -87,7 +87,6 @@ pub fn is_png(buf: &[u8]) -> bool {
 
 #[cfg(test)]
 mod tests {
-    use std::io::Cursor;
     use super::*;
 
     #[test]
@@ -98,12 +97,12 @@ mod tests {
             b"\x89PNG\x0d\x0a\x1a",
         ];
         for &data in sets {
-            assert_err_pat!(get_exif_attr(&mut Cursor::new(data)),
+            assert_err_pat!(get_exif_attr(&mut &data[..]),
                             Error::InvalidFormat("Broken PNG file"));
         }
 
         let mut data = b"\x89PNG\x0d\x0a\x1a\x0a\0\0\0\x04eXIfExif".to_vec();
-        get_exif_attr(&mut Cursor::new(&data)).unwrap();
+        get_exif_attr(&mut &data[..]).unwrap();
         while let Some(_) = data.pop() {
             get_exif_attr(&mut &data[..]).unwrap_err();
         }
@@ -112,19 +111,19 @@ mod tests {
     #[test]
     fn no_exif() {
         let data = b"\x89PNG\x0d\x0a\x1a\x0a";
-        assert_err_pat!(get_exif_attr(&mut Cursor::new(data)),
+        assert_err_pat!(get_exif_attr(&mut &data[..]),
                         Error::NotFound(_));
     }
 
     #[test]
     fn empty() {
         let data = b"\x89PNG\x0d\x0a\x1a\x0a\0\0\0\0eXIfCRC_";
-        assert_ok!(get_exif_attr(&mut Cursor::new(data)), []);
+        assert_ok!(get_exif_attr(&mut &data[..]), []);
     }
 
     #[test]
     fn non_empty() {
         let data = b"\x89PNG\x0d\x0a\x1a\x0a\0\0\0\x02eXIf\xbe\xadCRC_";
-        assert_ok!(get_exif_attr(&mut Cursor::new(data)), [0xbe, 0xad]);
+        assert_ok!(get_exif_attr(&mut &data[..]), [0xbe, 0xad]);
     }
 }
diff --git a/src/util.rs b/src/util.rs
index e5dd0e4..1a8485c 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -94,18 +94,18 @@ pub fn ctou32(c: u8) -> Result<u32, Error> {
 
 #[cfg(test)]
 mod tests {
-    use std::io::Cursor;
     use std::io::ErrorKind;
     use std::io::Read;
     use super::*;
 
     #[test]
     fn read8_len() {
-        let mut reader = Cursor::new([]);
-        assert_err_kind!(read8(&mut reader), ErrorKind::UnexpectedEof);
-        let mut reader = Cursor::new([0x01]);
-        assert_ok!(read8(&mut reader), 0x01);
-        let mut reader = Cursor::new([0x01, 0x02]);
+        let data = [];
+        assert_err_kind!(read8(&mut &data[..]), ErrorKind::UnexpectedEof);
+        let data = [0x01];
+        assert_ok!(read8(&mut &data[..]), 0x01);
+        let data = [0x01, 0x02];
+        let mut reader = &data[..];
         let mut buf = Vec::new();
         assert_ok!(read8(&mut reader), 0x01);
         assert_ok!(reader.read_to_end(&mut buf), 1);
@@ -114,13 +114,14 @@ mod tests {
 
     #[test]
     fn read16_len() {
-        let mut reader = Cursor::new([]);
-        assert_err_kind!(read16(&mut reader), ErrorKind::UnexpectedEof);
-        let mut reader = Cursor::new([0x01]);
-        assert_err_kind!(read16(&mut reader), ErrorKind::UnexpectedEof);
-        let mut reader = Cursor::new([0x01, 0x02]);
-        assert_ok!(read16(&mut reader), 0x0102);
-        let mut reader = Cursor::new([0x01, 0x02, 0x03]);
+        let data = [];
+        assert_err_kind!(read16(&mut &data[..]), ErrorKind::UnexpectedEof);
+        let data = [0x01];
+        assert_err_kind!(read16(&mut &data[..]), ErrorKind::UnexpectedEof);
+        let data = [0x01, 0x02];
+        assert_ok!(read16(&mut &data[..]), 0x0102);
+        let data = [0x01, 0x02, 0x03];
+        let mut reader = &data[..];
         let mut buf = Vec::new();
         assert_ok!(read16(&mut reader), 0x0102);
         assert_ok!(reader.read_to_end(&mut buf), 1);