Add test for round-robin host rotation.

Author: kishorenc

src/test/java/org/typesense/api/APICallTest.java

@@ -0,0 +1,42 @@
+package org.typesense.api;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.typesense.resources.Node;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class APICallTest {
+
+    private ApiCall apiCall;
+
+    @BeforeEach
+    void setUp() throws Exception {
+        List<Node> nodes = new ArrayList<>();
+        nodes.add(new Node("http","localhost","8108"));
+        nodes.add(new Node("http","localhost","7108"));
+        nodes.add(new Node("http","localhost","6108"));
+        apiCall = new ApiCall(new Configuration(nodes, Duration.ofSeconds(3),"xyz"));
+    }
+
+    @AfterEach
+    void tearDown() throws Exception {
+
+    }
+
+    @Test
+    void testRoundRobin() throws Exception {
+        assertEquals("7108", apiCall.getNode().port);
+        assertEquals("6108", apiCall.getNode().port);
+        assertEquals("8108", apiCall.getNode().port);
+
+        assertEquals("7108", apiCall.getNode().port);
+        assertEquals("6108", apiCall.getNode().port);
+        assertEquals("8108", apiCall.getNode().port);
+    }
+}