tink-prf: rename test methods

Merge upstream commit:
 - 06b2eaa8da51 Clean up prf/subtle package.

Author: daviddrysdale

tests/tests/prf_test/subtle/aes_cmac_test.rs

@@ -75,7 +75,7 @@ pub struct TestCase {
 }
 
 #[test]
-fn test_vectors_wycheproof() {
+fn test_aes_cmac_prf_wycheproof_cases() {
     let filename = "testvectors/aes_cmac_test.json";
     println!("wycheproof file '{}'", filename);
     let bytes = tink_tests::wycheproof_data(filename);

tests/tests/prf_test/subtle/hkdf_test.rs

@@ -139,7 +139,7 @@ struct HkdfTestCase {
 }
 
 #[test]
-fn test_vectors_hkdf_wycheproof() {
+fn test_hkdf_prf_wycheproof_cases() {
     for hash in &[HashType::Sha1, HashType::Sha256, HashType::Sha512] {
         let hash_name = format!("{:?}", hash);
         let filename = format!("testvectors/hkdf_{}_test.json", hash_name.to_lowercase());

tests/tests/prf_test/subtle/hmac_test.rs

@@ -98,7 +98,7 @@ fn test_vectors_rfc4868() {
 }
 
 #[test]
-fn test_vectors_hmac_wycheproof() {
+fn test_hmac_prf_wycheproof_cases() {
     for hash in &[HashType::Sha1, HashType::Sha256, HashType::Sha512] {
         let hash_name = format!("{:?}", hash);
         let filename = format!("testvectors/hmac_{}_test.json", hash_name.to_lowercase());