Resolve "Senden von Nachrichten vorbereiten"

Closes #4 (closed)

src/test/java/de/ozgcloud/nachrichten/postfach/osiv2/transfer/PostfachApiFacadeServiceTest.java

+package de.ozgcloud.nachrichten.postfach.osiv2.transfer;
+
+import static de.ozgcloud.nachrichten.postfach.osiv2.factory.PostfachAddressTestFactory.*;
+import static org.mockito.Mockito.*;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+
+import de.ozgcloud.nachrichten.postfach.PostfachNachricht;
+import de.ozgcloud.nachrichten.postfach.osiv2.factory.PostfachNachrichtTestFactory;
+import de.ozgcloud.nachrichten.postfach.osiv2.gen.api.MessageExchangeApi;
+import de.ozgcloud.nachrichten.postfach.osiv2.gen.model.MessageExchangeSendMessageResponse;
+import de.ozgcloud.nachrichten.postfach.osiv2.gen.model.OutSendMessageRequestV2;
+import reactor.core.publisher.Mono;
+
+class PostfachApiFacadeServiceTest {
+
+	@InjectMocks
+	PostfachApiFacadeService postfachApiFacadeService;
+
+	@Mock
+	MessageExchangeApi messageExchangeApi;
+
+	@Mock
+	RequestMapper requestMapper;
+
+	@Mock
+	ResponseMapper responseMapper;
+
+	@DisplayName("send message")
+	@Nested
+	class TestSendMessage {
+
+		@Mock
+		OutSendMessageRequestV2 outSendMessageRequestV2;
+
+		@Mock
+		MessageExchangeSendMessageResponse messageExchangeSendMessageResponse;
+
+		private final PostfachNachricht nachricht = PostfachNachrichtTestFactory.create();
+
+		@BeforeEach
+		void mock() {
+			var responseMono = Mono.just(messageExchangeSendMessageResponse);
+			when(requestMapper.mapMailboxId(nachricht)).thenReturn(MAILBOX_ID);
+			when(requestMapper.mapOutSendMessageRequestV2(nachricht)).thenReturn(outSendMessageRequestV2);
+			when(messageExchangeApi.sendMessage(any(), any())).thenReturn(responseMono);
+		}
+
+		@DisplayName("should call sendMessage")
+		@Test
+		void shouldCallSendMessage() {
+			postfachApiFacadeService.sendMessage(nachricht);
+
+			verify(messageExchangeApi).sendMessage(MAILBOX_ID, outSendMessageRequestV2);
+
+		}
+	}
+
+}
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