add more unit tests for improving coverage

sdk-workflows/src/test/java/io/dapr/workflows/client/NewWorkflowOptionTest.java

@@ -0,0 +1,28 @@
+package io.dapr.workflows.client;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.time.Instant;
+
+public class NewWorkflowOptionTest {
+
+  @Test
+  void testNewWorkflowOption() {
+    NewWorkflowOption workflowOption = new NewWorkflowOption();
+    String version = "v1";
+    String instanceId = "123";
+    Object input = new Object();
+    Instant startTime = Instant.now();
+
+    workflowOption.setVersion(version)
+        .setInstanceId(instanceId)
+        .setInput(input)
+        .setStartTime(startTime);
+
+    Assertions.assertEquals(version, workflowOption.getVersion());
+    Assertions.assertEquals(instanceId, workflowOption.getInstanceId());
+    Assertions.assertEquals(input, workflowOption.getInput());
+    Assertions.assertEquals(startTime, workflowOption.getStartTime());
+  }
+}