Complete GetLatestBlockhashContractTest

client/src/integration-test/java/com/lmax/solana4j/client/jsonrpc/GetLatestBlockhashContractTest.java

@@ -1,30 +1,31 @@
 package com.lmax.solana4j.client.jsonrpc;
 
+import com.lmax.solana4j.client.api.SolanaClientOptionalParams;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+// https://solana.com/docs/rpc/http/getlatestblockhash
 class GetLatestBlockhashContractTest extends SolanaClientIntegrationTestBase
 {
     @Test
     void shouldGetLatestBlockhash() throws SolanaJsonRpcClientException
     {
-//        {
-//            "jsonrpc" : "2.0",
-//                "result" : {
-//            "context" : {
-//                "apiVersion" : "2.0.14",
-//                        "slot" : 117
-//            },
-//            "value" : {
-//                "blockhash" : "8hmtSxyZRLcXEwpVZyaeniQJevxQkLje3mLgFvyToWLs",
-//                        "lastValidBlockHeight" : 267
-//            }
-//        },
-//            "id" : 4
-//        }
         final var latestBlockhash = api.getLatestBlockhash().getResponse();
         assertThat(latestBlockhash.getBlockhashBase58()).isNotBlank();
         assertThat(latestBlockhash.getLastValidBlockHeight()).isGreaterThan(0);
     }
+
+    @Test
+    void shouldReturnErrorForMinContextSlotNotReached() throws SolanaJsonRpcClientException
+    {
+        final SolanaClientOptionalParams optionalParams = new SolanaJsonRpcClientOptionalParams();
+        optionalParams.addParam("minContextSlot", 10000000000L);
+
+        final var response = api.getLatestBlockhash(optionalParams);
+
+        assertThat(response.isSuccess()).isFalse();
+        assertThat(response.getError().getErrorCode()).isEqualTo(-32016L);
+        assertThat(response.getError().getErrorMessage()).isEqualTo("Minimum context slot has not been reached");
+    }
 }