Add - Is there a Destructor in Java (#12345)

core-java-modules/core-java-9/src/test/java/com/baeldung/java9/finalizers/FinalizeUnitTest.java

@@ -0,0 +1,30 @@
+package com.bealdung.java9.finalizers;
+
+import org.junit.jupiter.api.Test;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class FinalizeUnitTest {
+
+    @Test
+    void givenFilename_whenGetLineNumber_thenReturnCorrectNumber() throws IOException {
+        final File tmpFile = File.createTempFile("test", ".tmp");
+        final BufferedWriter writer = new BufferedWriter(new FileWriter(tmpFile));
+        writer.write("Baeldung");
+        writer.close();
+
+        long lineNumber = 0;
+        try (Resource resource = new Resource(tmpFile.getAbsolutePath())) {
+            lineNumber = resource.getLineNumber();
+        } catch (Exception e) {
+            System.err.println("Error " + e);
+        }
+
+        assertEquals(1, lineNumber);
+    }
+}