add missing integration test for InventoryDatabaseAdapter

src/test/java/io/wkrzywiec/hexagonal/library/inventory/infrastructure/InventoryDatabaseAdapterITCase.java

@@ -0,0 +1,46 @@
+package io.wkrzywiec.hexagonal.library.inventory.infrastructure;
+
+import io.wkrzywiec.hexagonal.library.TestData;
+import io.wkrzywiec.hexagonal.library.inventory.model.Book;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.jdbc.core.JdbcTemplate;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@DataJpaTest
+public class InventoryDatabaseAdapterITCase {
+
+    @Autowired
+    private BookRepository bookRepository;
+
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    private InventoryDatabaseAdapter database;
+
+    @BeforeEach
+    public void init() {
+        database = new InventoryDatabaseAdapter(bookRepository);
+    }
+
+    @Test
+    @DisplayName("Save new book in database")
+    public void givenBook_whenSaveIt_thenBookIsSaved() {
+        //given
+        Book homoDeusBook = TestData.homoDeusBook();
+
+        //when
+        database.save(homoDeusBook);
+
+        //then
+        Long savedBookId = jdbcTemplate.queryForObject(
+                "SELECT id FROM book",
+                Long.class);
+
+        assertTrue(savedBookId > 0);
+    }
+}