diff --git a/kbkdf/src/lib.rs b/kbkdf/src/lib.rs
index b5e1a42..96c3f16 100644
--- a/kbkdf/src/lib.rs
+++ b/kbkdf/src/lib.rs
@@ -127,7 +127,7 @@ where
 ///  - Prf - the Pseudorandom Function to derive keys from
 ///  - K - the expected output length of the newly derived key
 ///  - R - An integer (1 <= r <= 32) that indicates the length of the binary encoding of the counter i
-///        as an integer in the interval [1, 2r − 1].
+///    as an integer in the interval [1, 2r − 1].
 pub trait Kbkdf<Prf, K, R: sealed::R>
 where
     Prf: Mac + KeyInit,
diff --git a/kbkdf/src/tests.rs b/kbkdf/src/tests.rs
index df89e2b..0345406 100644
--- a/kbkdf/src/tests.rs
+++ b/kbkdf/src/tests.rs
@@ -79,7 +79,7 @@ fn test_static_values_counter() {
                     .with_context(v.context)
                     .build()
             ),
-            Ok(Array::<_, _>::try_from(v.expected).unwrap().clone()),
+            Ok(Array::<_, _>::try_from(v.expected).unwrap()),
             "key derivation failed for (index: {i}):\n{v:x?}"
         );
     }
@@ -97,13 +97,22 @@ fn test_counter_kbkdfvs() {
     let counter = Counter::<HmacSha256, MockOutput>::default();
     // KDFCTR_gen.txt count 15
     assert_eq!(
-            counter.derive(Params::builder(
-                &hex!("43eef6d824fd820405626ab9b6d79f1fd04e126ab8e17729e3afc7cb5af794f8")).use_l(false).use_separator(
-                false).with_label(
-                &hex!("5e269b5a7bdedcc3e875e2725693a257fc60011af7dcd68a3358507fe29b0659ca66951daa05a15032033650bc58a27840f8fbe9f4088b9030738f68")).build()
-            ),
-            Ok(Array::<u8, U32>::from(hex!("f0a339ecbcae6add1afb27da3ba40a1320c6427a58afb9dc366b219b7eb29ecf")).clone()),
-        );
+        counter.derive(
+            Params::builder(&hex!(
+                "43eef6d824fd820405626ab9b6d79f1fd04e126ab8e17729e3afc7cb5af794f8"
+            ))
+            .use_l(false)
+            .use_separator(false)
+            .with_label(&hex!(
+                "5e269b5a7bdedcc3e875e2725693a257fc60011af7dcd68a3358507fe29b0659"
+                "ca66951daa05a15032033650bc58a27840f8fbe9f4088b9030738f68"
+            ))
+            .build()
+        ),
+        Ok(Array::<u8, U32>::from(hex!(
+            "f0a339ecbcae6add1afb27da3ba40a1320c6427a58afb9dc366b219b7eb29ecf"
+        ))),
+    );
 }
 
 static KNOWN_VALUES_FEEDBACK_HMAC_SHA256: &[KnownValue] = &[
@@ -172,7 +181,7 @@ fn test_static_values_feedback() {
                     .with_context(v.context)
                     .build()
             ),
-            Ok(Array::<_, _>::try_from(v.expected).unwrap().clone()),
+            Ok(Array::<_, _>::try_from(v.expected).unwrap()),
             "key derivation failed for (index: {i}):\n{v:x?}"
         );
     }
@@ -215,7 +224,7 @@ fn test_static_values_double_pipeline() {
                     .with_context(v.context)
                     .build(),
             ),
-            Ok(Array::<_, _>::try_from(v.expected).unwrap().clone()),
+            Ok(Array::<_, _>::try_from(v.expected).unwrap()),
             "key derivation failed for (index: {i}):\n{v:x?}"
         );
     }
diff --git a/kbkdf/tests/kbkdf/parser.rs b/kbkdf/tests/kbkdf/parser.rs
index 554f762..5e48ce9 100644
--- a/kbkdf/tests/kbkdf/parser.rs
+++ b/kbkdf/tests/kbkdf/parser.rs
@@ -1,5 +1,4 @@
 use digest::consts::*;
-use hex;
 use kbkdf::{Kbkdf, Params};
 
 use core::{convert::TryInto, ops::Mul};
@@ -43,10 +42,8 @@ impl Prf {
     }
 
     fn is_supported(&self) -> bool {
-        match self {
-            Self::CmacTdes2 | Self::CmacTdes3 => false,
-            _ => true,
-        }
+        let not_supported = matches!(self, Self::CmacTdes2 | Self::CmacTdes3);
+        !not_supported
     }
 }
 
@@ -72,10 +69,7 @@ impl CounterLocation {
     }
 
     fn is_supported(&self) -> bool {
-        match self {
-            Self::Before | Self::AfterIter => true,
-            _ => false,
-        }
+        matches!(self, Self::Before | Self::AfterIter)
     }
 }
 
@@ -431,11 +425,11 @@ fn eval_test_vectors<T: TestData>(data: &str, use_counter: bool) -> Option<()> {
         }
 
         // Read and parse KBKDF configuration.
-        let prf = Prf::from_str(&l);
+        let prf = Prf::from_str(l);
         let (counter_location, r_len) = if use_counter {
             (
                 CounterLocation::from_str(data.next().unwrap()),
-                Rlen::from_str(&data.next().unwrap()),
+                Rlen::from_str(data.next().unwrap()),
             )
         } else {
             // Counter location and r-len are not needed and do not present in a test file.