added junit

src/test/java/it/gov/pagopa/pu/organization/config/LocalDateTimeToOffsetDateTimeSerializerTest.java

@@ -0,0 +1,48 @@
+package it.gov.pagopa.pu.organization.config;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import it.gov.pagopa.pu.organization.config.json.LocalDateTimeToOffsetDateTimeSerializer;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+
+import static org.mockito.Mockito.*;
+
+@ExtendWith(MockitoExtension.class)
+class LocalDateTimeToOffsetDateTimeSerializerTest {
+
+  @Mock
+  private JsonGenerator jsonGenerator;
+
+  @Mock
+  private SerializerProvider serializerProvider;
+
+  private LocalDateTimeToOffsetDateTimeSerializer dateTimeSerializer;
+
+  @BeforeEach
+  public void setUp() {
+    dateTimeSerializer = new LocalDateTimeToOffsetDateTimeSerializer();
+  }
+
+  @Test
+  void testDateSerializer() throws IOException {
+    LocalDateTime localDateTime = LocalDateTime.of(2025, 1, 16, 9, 15,20);
+
+    dateTimeSerializer.serialize(localDateTime, jsonGenerator, serializerProvider);
+
+    verify(jsonGenerator).writeString("2025-01-16T09:15:20+01:00");
+  }
+
+  @Test
+  void testNullDateSerializer() throws IOException {
+    dateTimeSerializer.serialize(null, jsonGenerator, serializerProvider);
+
+    verifyNoInteractions(jsonGenerator);
+  }
+}