diff --git a/.gitpod.Dockerfile b/.gitpod.Dockerfile
index a8707e2..584ffc2 100644
--- a/.gitpod.Dockerfile
+++ b/.gitpod.Dockerfile
@@ -1,3 +1,19 @@
+#
+#  Copyright 2022 The original authors
+#
+#  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 .
+#
+
 FROM gitpod/workspace-full
 
 RUN bash -c ". /home/gitpod/.sdkman/bin/sdkman-init.sh \
diff --git a/.gitpod.yml b/.gitpod.yml
index daffe48..9077e94 100644
--- a/.gitpod.yml
+++ b/.gitpod.yml
@@ -1,3 +1,19 @@
+#
+#  Copyright 2022 The original authors
+#
+#  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 .
+#
+
 image:
   file: .gitpod.Dockerfile
 
diff --git a/etc/eclipse-formatter-config.xml b/etc/eclipse-formatter-config.xml
index 833b72c..fbacaa2 100644
--- a/etc/eclipse-formatter-config.xml
+++ b/etc/eclipse-formatter-config.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <!--
 
-     Copyright 2021 The original authors
+     Copyright 2022 The original authors
 
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
@@ -13,7 +13,7 @@
      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.
+     limitations under the License .
 
 -->
 <profiles version="12">
diff --git a/jreleaser.yml b/jreleaser.yml
index 9f29812..1e1be42 100644
--- a/jreleaser.yml
+++ b/jreleaser.yml
@@ -1,5 +1,5 @@
 #
-#  Copyright 2021 The original authors
+#  Copyright 2022 The original authors
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -11,7 +11,7 @@
 #  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.
+#  limitations under the License .
 #
 
 project:
diff --git a/pom.xml b/pom.xml
index da40230..97ce124 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,4 +1,21 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+     Copyright 2022 The original authors
+
+     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 .
+
+-->
 <project xmlns="http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
diff --git a/src/main/assembly/assembly.xml b/src/main/assembly/assembly.xml
index 07de4f4..12d36d4 100644
--- a/src/main/assembly/assembly.xml
+++ b/src/main/assembly/assembly.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!--
 
-     Copyright 2021 The original authors
+     Copyright 2022 The original authors
 
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
@@ -13,7 +13,7 @@
      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.
+     limitations under the License .
 
 -->
 <assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.0"
diff --git a/src/main/java/org/rrajesh1979/demo/MyCheckSum.java b/src/main/java/org/rrajesh1979/demo/MyCheckSum.java
index b65a2be..9220f54 100644
--- a/src/main/java/org/rrajesh1979/demo/MyCheckSum.java
+++ b/src/main/java/org/rrajesh1979/demo/MyCheckSum.java
@@ -1,3 +1,19 @@
+/*
+ *  Copyright 2022 The original authors
+ *
+ *  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 org.rrajesh1979.demo;
 
 import java.io.File;
diff --git a/src/main/resources/testdata/TestFile-1.txt b/src/main/resources/testdata/TestFile-1.txt
deleted file mode 100644
index c57eff5..0000000
--- a/src/main/resources/testdata/TestFile-1.txt
+++ /dev/null
@@ -1 +0,0 @@
-Hello World!
\ No newline at end of file
diff --git a/src/test/java/org/rrajesh1979/demo/MyCheckSumTest.java b/src/test/java/org/rrajesh1979/demo/MyCheckSumTest.java
new file mode 100644
index 0000000..8b19723
--- /dev/null
+++ b/src/test/java/org/rrajesh1979/demo/MyCheckSumTest.java
@@ -0,0 +1,52 @@
+/*
+ *  Copyright 2022 The original authors
+ *
+ *  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 org.rrajesh1979.demo;
+
+import java.io.*;
+import java.math.BigInteger;
+import java.security.NoSuchAlgorithmException;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MyCheckSumTest {
+
+    @Test
+    void main() {
+    }
+
+    @Test
+    void getCheckSum() throws IOException, NoSuchAlgorithmException {
+        File tempFile = createTempDataFile();
+
+        byte[] checkSumBytes = MyCheckSum.getCheckSum(tempFile.getAbsolutePath());
+        String calculatedCheckSum = new BigInteger(checkSumBytes).toString(16);
+
+        tempFile.delete();
+        String expectedCheckSum = "764efa883dda1e11db47671c4a3bbd9e";
+        assertEquals(expectedCheckSum, calculatedCheckSum);
+    }
+
+    static File createTempDataFile() throws IOException {
+        File tempFile = File.createTempFile("checksum", "test");
+        try (FileOutputStream fileOutputStream = new FileOutputStream(tempFile)) {
+            fileOutputStream.write("hi\n".getBytes());
+            fileOutputStream.flush();
+        }
+        return tempFile;
+    }
+}