Added JUnit Test Cases.

src/test/java/com/example/service/AzureAppConfigServiceTest.java

@@ -14,29 +14,34 @@ import static org.junit.Assert.assertNotNull;
 public class AzureAppConfigServiceTest {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(AzureAppConfigServiceTest.class);
-    AzureAppConfigService azureAppConfigService;
+    private static final String APP_CONFIGURATION_CONNECTION_STRING = "APP_CONFIGURATION_CONNECTION_STRING";
+    private static final String EXISTING_KEY = "config.message";
+    private static final String EXISTING_VALUE = "This is Azure App Config";
+    private static final String NEW_KEY = "config.dataSource";
+    private static final String NEW_VALUE = "Data Source URL";
+    private AzureAppConfigService azureAppConfigService;
 
     @Before
     public void setUp() {
-        String app_configuration_connection_string = System.getenv("APP_CONFIGURATION_CONNECTION_STRING");
+        String app_configuration_connection_string = System.getenv(APP_CONFIGURATION_CONNECTION_STRING);
         ConfigurationClient configurationClient = new ConfigurationClientBuilder().connectionString(app_configuration_connection_string).buildClient();
         azureAppConfigService = new AzureAppConfigService(configurationClient, new SettingSelector());
     }
 
     @Test
     public void getValueByKey() {
-        String valueByKey = azureAppConfigService.getValueByKey("config.message");
+        String valueByKey = azureAppConfigService.getValueByKey(EXISTING_KEY);
         LOGGER.info(valueByKey);
         assertNotNull(valueByKey);
-        assertEquals("This is Azure App Config", valueByKey);
+        assertEquals(EXISTING_VALUE, valueByKey);
     }
 
     @Test
     public void writeValueByKey() {
-        String writeValueByKey = azureAppConfigService.writeValueByKey("config.dataSource", "Data Source URL");
+        String writeValueByKey = azureAppConfigService.writeValueByKey(NEW_KEY, NEW_VALUE);
         LOGGER.info(writeValueByKey);
         assertNotNull(writeValueByKey);
-        assertEquals("Data Source URL", writeValueByKey);
+        assertEquals(NEW_VALUE, writeValueByKey);
     }
 
     @Test
@@ -47,13 +52,9 @@ public class AzureAppConfigServiceTest {
 
     @Test
     public void deleteValueByKey() {
-        String valueByKey = azureAppConfigService.deleteValueByKey("config.dataSource");
+        String valueByKey = azureAppConfigService.deleteValueByKey(NEW_KEY);
         LOGGER.info(valueByKey);
         assertNotNull(valueByKey);
-        assertEquals("Data Source URL", valueByKey);
-    }
-
-    @Test
-    public void azureAppConfiguration() {
+        assertEquals(NEW_VALUE, valueByKey);
     }
 }
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