feat: increase code coverage for retryHandlerFactory (#35)

* feat: increase code coverage - add retryHandlerFactory tests

* feat: tests for retryHandlerFactoryTest

* feat: update RetryHandlerFactory tests

* feat: update RetryHandlerFactory tests

Author: REETI-SARUP

src/test/java/com/intuit/springwebclient/retryHandler/RetryHandlerFactoryTest.java

@@ -0,0 +1,31 @@
+package com.intuit.springwebclient.retryHandler;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class RetryHandlerFactoryTest {
+  
+    @Test
+    public void testAddAndGetHandler() {
+        String handlerTestName = "retryHandlerTestName1";
+        RetryHandler retryHandler1 = new RetryHandler() {
+          
+            @Override
+            public void checkAndThrowRetriableException(Exception ex) {
+                throw new RuntimeException("test exception");
+            }
+
+            @Override
+            public String getName() {
+                return "defaultHandlerName";
+            }
+
+        };
+
+        RetryHandlerFactory.addHandler(handlerTestName, retryHandler1);
+      
+        Assertions.assertEquals(retryHandler1, RetryHandlerFactory.getHandler(handlerTestName));
+        Assertions.assertEquals("defaultHandlerName", RetryHandlerFactory.getHandler(handlerTestName).getName());
+        Assertions.assertNull(RetryHandlerFactory.getHandler("retryHandlerTestName2"));
+    }
+}