diff --git a/src/test/java/lambdas/FileFilterTest.java b/src/test/java/lambdas/FileFilterTest.java
new file mode 100644
index 0000000..5e573eb
--- /dev/null
+++ b/src/test/java/lambdas/FileFilterTest.java
@@ -0,0 +1,79 @@
+package lambdas;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class FileFilterTest {
+    private final File root = new File("src/main/java");
+
+    @Test
+    public void testListFiles() {
+        File[] files = root.listFiles();
+        assert files != null;
+        for (File file : files) {
+            System.out.println(file);
+        }
+        assertThat(files.length).isEqualTo(22);
+    }
+
+    @Test
+    void listDirectories_anonInnerClass() {
+        File[] directories = root.listFiles(new FileFilter() {
+            @Override
+            public boolean accept(File file) {
+                return file.isDirectory();
+            }
+        });
+        assert directories != null;
+        assertThat(directories.length).isEqualTo(14);
+    }
+
+    @Test
+    void listDirectories_expressionLambda() {
+        File[] directories = root.listFiles(file -> file.isDirectory());
+        assert directories != null;
+        assertThat(directories.length).isEqualTo(14);
+    }
+
+    @Test
+    void listDirectories_blockLambda() {
+        File[] directories = root.listFiles(file -> {
+            System.out.println("Checking " + file + " to see if it's a directory.");
+            return file.isDirectory();
+        });
+        assert directories != null;
+        assertThat(directories.length).isEqualTo(14);
+    }
+
+    @Test
+    void listJavaSrcFiles_fileFilter() {
+        File[] javaFiles = root.listFiles(file -> file.getName().endsWith(".java"));
+        assert javaFiles != null;
+        assertThat(javaFiles.length).isEqualTo(8);
+    }
+
+    @Test
+    void listJavaSrcFiles_fileNameFilter() {
+        File[] javaFiles = root.listFiles((dir, name) -> name.endsWith(".java"));
+        assert javaFiles != null;
+        assertThat(javaFiles.length).isEqualTo(8);
+    }
+
+    @Test
+    void forEachOnList() {
+        List<String> strings = List.of("this", "is", "a", "list", "of", "strings");
+
+        // Using the forEach(Consumer) method
+        strings.forEach(s -> System.out.println("The next string is " + s));
+
+        // For-each loop
+        for (String s : strings) {
+            System.out.println("The next string is " + s);
+        }
+    }
+}