JavaDoc + impl + test checkpoint. Returned to 100% code coverage

Author: lhazlewood

impl/src/test/groovy/io/jsonwebtoken/impl/security/TestPrivateKey.groovy

@@ -1,9 +1,25 @@
+/*
+ * Copyright © 2023 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package io.jsonwebtoken.impl.security
 
 import javax.security.auth.DestroyFailedException
+import javax.security.auth.Destroyable
 import java.security.PrivateKey
 
-class TestPrivateKey extends TestKey implements PrivateKey {
+class TestPrivateKey extends TestKey implements PrivateKey, Destroyable {
 
     boolean destroyed
 

impl/src/test/groovy/io/jsonwebtoken/impl/security/TestPublicKey.groovy

@@ -1,3 +1,18 @@
+/*
+ * Copyright © 2023 jsonwebtoken.io
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package io.jsonwebtoken.impl.security
 
 import java.security.PublicKey