Add TestForm class and set up related unit tests

The changes add a new TestForm class to implement unit tests for form handling in the application. The included tests verify the storing, retrieving, and verification of forms from a database, as well as form object creation and confirmation of form data. This is a step towards improving the code's reliability and making it easier to catch potential bugs or issues.

src/test/java/TestForm.java

@@ -0,0 +1,40 @@
+import com.alttd.forms.contact.ContactFormData;
+import com.alttd.forms.contact.StoreFormQuery;
+import com.alttd.forms.database.DatabaseConnection;
+import com.alttd.forms.form.Form;
+import com.alttd.forms.verify_mail.FormQuery;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.util.Optional;
+
+public class TestForm {
+
+    private static int code;
+
+    @BeforeAll
+    public static void testInsert() {
+        Assertions.assertDoesNotThrow(DatabaseConnection::initialize);
+        StoreFormQuery storeFormQuery = new StoreFormQuery();
+        ContactFormData contactFormData = new ContactFormData("akastijn", "akastijn@alttd.com", "This is a test question.");
+        storeFormQuery.storeFormForVerificationCode("akastijn@alttd.com", contactFormData).
+                thenAccept(code -> {
+                    TestForm.code = code;
+                    Assertions.assertTrue(code > 999 && code < 10000);
+                })
+                .exceptionally(throwable -> Assertions.fail());
+    }
+
+    @Test
+    public void testRetrieveForm() {
+        Assertions.assertDoesNotThrow(DatabaseConnection::initialize);
+        new FormQuery().getFormForCode(String.valueOf(code), "akastijn@alttd.com").thenAccept(result -> {
+            Assertions.assertTrue(result.failReason().isEmpty());
+            Optional<Form> optionalForm = result.form();
+            Assertions.assertTrue(optionalForm.isPresent());
+            Form form = optionalForm.get();
+            Assertions.assertInstanceOf(ContactFormData.class, form);
+        });
+    }
+}