#53 Implemented SQLite product data persistence + tests

src/test/java/de/rwu/easydrop/exception/PersistenceExceptionTest.java

@@ -0,0 +1,28 @@
+package de.rwu.easydrop.exception;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import org.junit.jupiter.api.Test;
+
+class PersistenceExceptionTest {
+
+    @Test
+    void testPersistenceExceptionWithMessage() {
+        String errorMessage = "Error occurred during data persistence.";
+        PersistenceException exception = new PersistenceException(errorMessage);
+
+        assertEquals(errorMessage, exception.getMessage());
+        assertNull(exception.getCause());
+    }
+
+    @Test
+    void testPersistenceExceptionWithMessageAndCause() {
+        String errorMessage = "Error occurred during data persistence.";
+        Throwable cause = new IllegalArgumentException("Invalid argument.");
+        PersistenceException exception = new PersistenceException(errorMessage, cause);
+
+        assertEquals(errorMessage, exception.getMessage());
+        assertEquals(cause, exception.getCause());
+    }
+}