BAEL-6403 - Extracting a Tar File in Java (#14240)

* code 1

* sibling module readme

* new module

* review 1

* review 2

libraries-apache-commons-2/src/test/java/com/baeldung/commons/untar/TarExtractorAntUnitTest.java

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+package com.baeldung.commons.untar;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+import org.junit.Test;
+
+import com.baeldung.commons.untar.impl.TarExtractorAnt;
+
+public class TarExtractorAntUnitTest {
+
+    @Test
+    public void givenTarFile_whenUntar_thenExtractedToDestination() throws IOException {
+        Path destination = Paths.get("/tmp/ant");
+
+        new TarExtractorAnt(Resources.tarFile(), false, destination).untar();
+
+        try (Stream<Path> files = Files.list(destination)) {
+            assertTrue(files.findFirst()
+                .isPresent());
+        }
+    }
+
+    @Test
+    public void givenTarGzFile_whenUntar_thenExtractedToDestination() throws IOException {
+        Path destination = Paths.get("/tmp/ant-gz");
+
+        new TarExtractorAnt(Resources.tarGzFile(), true, destination).untar();
+
+        try (Stream<Path> files = Files.list(destination)) {
+            assertTrue(files.findFirst()
+                .isPresent());
+        }
+    }
+}

libraries-apache-commons-2/src/test/java/com/baeldung/commons/untar/TarExtractorCommonsCompressUnitTest.java

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+package com.baeldung.commons.untar;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+import org.junit.jupiter.api.Test;
+
+import com.baeldung.commons.untar.impl.TarExtractorCommonsCompress;
+
+public class TarExtractorCommonsCompressUnitTest {
+
+    @Test
+    public void givenTarFile_whenUntar_thenExtractedToDestination() throws IOException {
+        Path destination = Paths.get("/tmp/commons-compress");
+
+        new TarExtractorCommonsCompress(Resources.tarFile(), false, destination).untar();
+
+        try (Stream<Path> files = Files.list(destination)) {
+            assertTrue(files.findFirst()
+                .isPresent());
+        }
+    }
+
+    @Test
+    public void givenTarGzFile_whenUntar_thenExtractedToDestination() throws IOException {
+        Path destination = Paths.get("/tmp/commons-compress-gz");
+
+        new TarExtractorCommonsCompress(Resources.tarGzFile(), true, destination).untar();
+
+        try (Stream<Path> files = Files.list(destination)) {
+            assertTrue(files.findFirst()
+                .isPresent());
+        }
+    }
+}

libraries-apache-commons-2/src/test/java/com/baeldung/commons/untar/TarExtractorVfsUnitTest.java

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+package com.baeldung.commons.untar;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.stream.Stream;
+
+import org.junit.Test;
+
+import com.baeldung.commons.untar.impl.TarExtractorVfs;
+
+public class TarExtractorVfsUnitTest {
+
+    @Test
+    public void givenTarFile_whenUntar_thenExtractedToDestination() throws IOException {
+        Path destination = Paths.get("/tmp/vfs");
+
+        new TarExtractorVfs(Resources.tarFile(), false, destination).untar();
+
+        try (Stream<Path> files = Files.list(destination)) {
+            assertTrue(files.findFirst()
+                .isPresent());
+        }
+    }
+
+    @Test
+    public void givenTarGzFile_whenUntar_thenExtractedToDestination() throws IOException {
+        Path destination = Paths.get("/tmp/vfs-gz");
+
+        new TarExtractorVfs(Resources.tarGzFile(), true, destination).untar();
+
+        try (Stream<Path> files = Files.list(destination)) {
+            assertTrue(files.findFirst()
+                .isPresent());
+        }
+    }
+}