diff --git a/candle-core/src/npy.rs b/candle-core/src/npy.rs
index f3a75965..1dfcc9b4 100644
--- a/candle-core/src/npy.rs
+++ b/candle-core/src/npy.rs
@@ -250,8 +250,6 @@ impl Tensor {
         if header.fortran_order {
             return Err(Error::Npy("fortran order not supported".to_string()));
         }
-        let mut data: Vec<u8> = vec![];
-        reader.read_to_end(&mut data)?;
         Self::from_reader(header.shape(), header.descr, &mut reader)
     }
 
diff --git a/candle-core/tests/npy.py b/candle-core/tests/npy.py
new file mode 100644
index 00000000..0fd2778a
--- /dev/null
+++ b/candle-core/tests/npy.py
@@ -0,0 +1,9 @@
+import numpy as np
+x = np.arange(10)
+
+# Write a npy file.
+np.save("test.npy", x)
+
+# Write multiple values to a npz file.
+values = { "x": x, "x_plus_one": x + 1 }
+np.savez("test.npz", **values)
diff --git a/candle-core/tests/serialization_tests.rs b/candle-core/tests/serialization_tests.rs
new file mode 100644
index 00000000..415306f4
--- /dev/null
+++ b/candle-core/tests/serialization_tests.rs
@@ -0,0 +1,24 @@
+use candle_core::{DType, Result, Tensor};
+
+#[test]
+fn npy() -> Result<()> {
+    let npy = Tensor::read_npy("tests/test.npy")?;
+    assert_eq!(
+        npy.to_dtype(DType::U8)?.to_vec1::<u8>()?,
+        [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+    );
+    Ok(())
+}
+
+#[test]
+fn npz() -> Result<()> {
+    let npz = Tensor::read_npz("tests/test.npz")?;
+    assert_eq!(npz.len(), 2);
+    assert_eq!(npz[0].0, "x");
+    assert_eq!(npz[1].0, "x_plus_one");
+    assert_eq!(
+        npz[1].1.to_dtype(DType::U8)?.to_vec1::<u8>()?,
+        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+    );
+    Ok(())
+}
diff --git a/candle-core/tests/test.npy b/candle-core/tests/test.npy
new file mode 100644
index 00000000..a3ff5af9
Binary files /dev/null and b/candle-core/tests/test.npy differ
diff --git a/candle-core/tests/test.npz b/candle-core/tests/test.npz
new file mode 100644
index 00000000..b6683caa
Binary files /dev/null and b/candle-core/tests/test.npz differ