#37 Added tests for ebay data source

src/test/java/de/rwu/easydrop/api/client/EbayItemDataSourceTest.java

@@ -0,0 +1,101 @@
+package de.rwu.easydrop.api.client;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.lang.reflect.Field;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.MockitoAnnotations;
+
+import com.jayway.jsonpath.JsonPath;
+import com.jayway.jsonpath.ReadContext;
+
+import de.rwu.easydrop.api.dto.ProductDTO;
+
+class EbayItemDataSourceTest {
+    private EbayItemDataSource demoDataSource;
+
+    private static String demoApiKey = "my-api-key";
+    private static String demoApiUrl = "https://www.example.com/api";
+    private static String demoDataOrigin = "eBay";
+    private static String demoQuery = "iPhone";
+
+    @BeforeEach
+    void setUp() {
+        demoDataSource = new EbayItemDataSource(demoApiUrl, demoApiKey);
+        MockitoAnnotations.openMocks(this);
+    }
+
+    @Test
+    void testConstructor() {
+        // Assert
+        try {
+            Field baseUrlField = EbayItemDataSource.class.getDeclaredField("baseUrl");
+            baseUrlField.setAccessible(true);
+            Assertions.assertEquals(demoApiUrl, baseUrlField.get(demoDataSource));
+
+            Field apiKeyField = EbayItemDataSource.class.getDeclaredField("apiKey");
+            apiKeyField.setAccessible(true);
+            Assertions.assertEquals(demoApiKey, apiKeyField.get(demoDataSource));
+        } catch (NoSuchFieldException e) {
+            Assertions.fail();
+        } catch (IllegalAccessException e) {
+            Assertions.fail();
+        }
+    }
+
+    @Test
+    void createApiUrl_ValidSearchQuery_ReturnsValidUrl() throws MalformedURLException {
+        String searchQuery = demoQuery;
+        URL apiUrl = demoDataSource.createApiUrl(searchQuery);
+
+        assertNotNull(apiUrl);
+        assertEquals("https://www.example.com/api/buy/browse/v1/item_summary/search?q=iPhone&limit=1&offset=0",
+                apiUrl.toString());
+    }
+
+    @Test
+    void buildProductDTO_ValidJson_ReturnsValidProductDTO() {
+        ProductDTO product = new ProductDTO(demoQuery, demoDataOrigin);
+        String json = "{\"itemSummaries\":[{\"shippingOptions\":[{\"guaranteedDelivery\":true,\"shippingCost\":{\"value\":10}}],\"price\":{\"value\":999.99},\"seller\":{\"username\":\"seller123\"}}]}";
+
+        ProductDTO result = demoDataSource.buildProductDTO(product, json);
+
+        assertEquals(demoDataOrigin, result.getDataOrigin());
+        assertEquals(true, result.isAvailable());
+        assertEquals(999.99, result.getCurrentPrice());
+        assertEquals(10.0, result.getDeliveryPrice());
+        assertEquals("seller123", result.getMerchant());
+    }
+
+    @Test
+    void buildProductDTO_InvalidJson_ReturnsProductDTOWithDefaults() {
+        ProductDTO product = new ProductDTO(demoQuery, demoDataOrigin);
+        String json = "{\"itemSummaries\":[]}"; // Empty JSON to simulate missing data
+
+        ProductDTO result = demoDataSource.buildProductDTO(product, json);
+
+        assertEquals("eBay", result.getDataOrigin());
+        assertEquals(false, result.isAvailable()); // Default value for boolean
+        assertEquals(0.0, result.getCurrentPrice()); // Default value for double
+        assertEquals(0.0, result.getDeliveryPrice()); // Default value for double
+        assertEquals(null, result.getMerchant()); // Default value for String
+    }
+
+    @Test
+    void getDataOrigin_ReturnsExpectedDataOrigin() {
+        String dataOrigin = demoDataSource.getDataOrigin();
+        assertEquals(demoDataOrigin, dataOrigin);
+    }
+
+    @Test
+    void getApiKey_ReturnsExpectedApiKey() {
+        String apiKey = demoDataSource.getApiKey();
+        assertEquals(demoApiKey, apiKey);
+    }
+}