diff --git a/diced/open_dice/tests/api_test.rs b/diced/open_dice/tests/api_test.rs
index 5b36f8d..3823bb7 100644
--- a/diced/open_dice/tests/api_test.rs
+++ b/diced/open_dice/tests/api_test.rs
@@ -14,20 +14,32 @@
  * limitations under the License.
  */
 
-use diced_open_dice::{derive_cdi_certificate_id, hash, ID_SIZE};
+use diced_open_dice::{
+    derive_cdi_certificate_id, hash, kdf, HASH_SIZE, ID_SIZE, PRIVATE_KEY_SEED_SIZE,
+};
 
 #[test]
 fn hash_succeeds() {
-    assert_eq!(
-        hash(b"hello world").expect("hash failed"),
-        [
-            0x30, 0x9e, 0xcc, 0x48, 0x9c, 0x12, 0xd6, 0xeb, 0x4c, 0xc4, 0x0f, 0x50, 0xc9, 0x02,
-            0xf2, 0xb4, 0xd0, 0xed, 0x77, 0xee, 0x51, 0x1a, 0x7c, 0x7a, 0x9b, 0xcd, 0x3c, 0xa8,
-            0x6d, 0x4c, 0xd8, 0x6f, 0x98, 0x9d, 0xd3, 0x5b, 0xc5, 0xff, 0x49, 0x96, 0x70, 0xda,
-            0x34, 0x25, 0x5b, 0x45, 0xb0, 0xcf, 0xd8, 0x30, 0xe8, 0x1f, 0x60, 0x5d, 0xcf, 0x7d,
-            0xc5, 0x54, 0x2e, 0x93, 0xae, 0x9c, 0xd7, 0x6f
-        ]
-    );
+    const EXPECTED_HASH: [u8; HASH_SIZE] = [
+        0x30, 0x9e, 0xcc, 0x48, 0x9c, 0x12, 0xd6, 0xeb, 0x4c, 0xc4, 0x0f, 0x50, 0xc9, 0x02, 0xf2,
+        0xb4, 0xd0, 0xed, 0x77, 0xee, 0x51, 0x1a, 0x7c, 0x7a, 0x9b, 0xcd, 0x3c, 0xa8, 0x6d, 0x4c,
+        0xd8, 0x6f, 0x98, 0x9d, 0xd3, 0x5b, 0xc5, 0xff, 0x49, 0x96, 0x70, 0xda, 0x34, 0x25, 0x5b,
+        0x45, 0xb0, 0xcf, 0xd8, 0x30, 0xe8, 0x1f, 0x60, 0x5d, 0xcf, 0x7d, 0xc5, 0x54, 0x2e, 0x93,
+        0xae, 0x9c, 0xd7, 0x6f,
+    ];
+    assert_eq!(EXPECTED_HASH, hash(b"hello world").expect("hash failed"));
+}
+
+#[test]
+fn kdf_succeeds() {
+    let mut derived_key = [0u8; PRIVATE_KEY_SEED_SIZE];
+    kdf(b"myInitialKeyMaterial", b"mySalt", b"myInfo", &mut derived_key).unwrap();
+    const EXPECTED_DERIVED_KEY: [u8; PRIVATE_KEY_SEED_SIZE] = [
+        0x91, 0x9b, 0x8d, 0x29, 0xc4, 0x1b, 0x93, 0xd7, 0xeb, 0x09, 0xfa, 0xd7, 0xc9, 0x87, 0xb0,
+        0xd1, 0xcc, 0x26, 0xef, 0x07, 0x83, 0x42, 0xcf, 0xa3, 0x45, 0x0a, 0x57, 0xe9, 0x19, 0x86,
+        0xef, 0x48,
+    ];
+    assert_eq!(EXPECTED_DERIVED_KEY, derived_key);
 }
 
 #[test]