* Added copyright header

* Renamed the tests.
* Added author.

.gitignore

@@ -1,7 +1,7 @@
 .settings
 .classpath
 .project
-target
+/target
 test-output
 .idea
 *.iml

README.adoc

@@ -7,7 +7,7 @@
 // "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
+//   https://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

src/main/java/com/soebes/module/calculator/ByteArrayWrapper.java

@@ -1,7 +1,29 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import java.util.Arrays;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 final class ByteArrayWrapper {
   private final byte[] byteArray;
 

src/main/java/com/soebes/module/calculator/CalculateChecksum.java

@@ -1,12 +1,34 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 final class CalculateChecksum {
   private static final int BUFFER_SIZE = 64 * 1024;
 

src/main/java/com/soebes/module/calculator/ChecksumForFileResult.java

@@ -1,8 +1,30 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import java.security.NoSuchAlgorithmException;
 import java.util.Objects;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 final class ChecksumForFileResult {
 
   /**

src/main/java/com/soebes/module/calculator/ChecksumResult.java

@@ -1,7 +1,29 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import java.util.Objects;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 final class ChecksumResult {
   private final byte[] digest;
 

src/main/java/com/soebes/module/calculator/FileSelector.java

@@ -1,5 +1,24 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -10,6 +29,9 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 final class FileSelector {
   private static final Predicate<Path> IS_REGULAR_FILE = Files::isRegularFile;
   private static final Predicate<Path> IS_READABLE = Files::isReadable;

src/main/java/com/soebes/module/calculator/ModuleCalculator.java

@@ -1,16 +1,38 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.Collections;
 import java.util.List;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import static com.soebes.module.calculator.FileSelector.selectAllFiles;
 import static com.soebes.module.calculator.FileSelector.toChecksumForFile;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 public final class ModuleCalculator {
 
   private final Logger LOGGER = LoggerFactory.getLogger( getClass() );

src/test/java/com/soebes/module/calculator/ByteArrayWrapperTest.java

@@ -1,11 +1,33 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import nl.jqno.equalsverifier.EqualsVerifier;
 import nl.jqno.equalsverifier.Warning;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 class ByteArrayWrapperTest {
 
   @Test

src/test/java/com/soebes/module/calculator/FileSelectorTest.java

@@ -1,5 +1,24 @@
 package com.soebes.module.calculator;
 
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 import com.github.marschall.memoryfilesystem.MemoryFileSystemBuilder;
 import org.junit.jupiter.api.Test;
 
@@ -15,6 +34,9 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 
+/**
+ * @author Karl Heinz Marbaise
+ */
 class FileSelectorTest {
 
   @Test