solution: integration test with Rinkeby

testing/trial/src/main/groovy/io/emeraldpay/dshackle/testing/trial/ProxyClient.groovy

@@ -32,6 +32,10 @@ class ProxyClient {
         return forPrefix(18081, "eth")
     }
 
+    static ProxyClient ethereumRinkeby() {
+        return forPrefix(18081, "rinkeby")
+    }
+
     static ProxyClient forPrefix(String prefix) {
         return forPrefix(18080, prefix)
     }

testing/trial/src/test/groovy/io/emeraldpay/dshackle/testing/trial/rinkeby/CallContractSpec.groovy

@@ -0,0 +1,30 @@
+package io.emeraldpay.dshackle.testing.trial.rinkeby
+
+import io.emeraldpay.dshackle.testing.trial.ProxyClient
+import spock.lang.IgnoreIf
+import spock.lang.Specification
+
+@IgnoreIf({ System.getProperty('trialMode') != 'rinkeby' })
+class CallContractSpec extends Specification {
+
+    def client = ProxyClient.ethereumRinkeby()
+
+    def "get block"() {
+        when:
+        def act = client.execute(65, "eth_call",
+                [
+                        [
+                                "to"  : "0xB8Ba177465b3d696180742c6ba58C408175CB6Dd",
+                                "data": "0x70a08231000000000000000000000000da3f87aa38d07f1fc836873a3b34ec23088ef78a"
+                        ],
+                        "0xc90f1c8c125a4d5b90742f16947bdb1d10516f173fd7fc51223d10499de2a812"
+                ]
+        )
+        then:
+        act.id == 65
+        act.result != null
+        act.result == "0x000000000000000000000000000000000000000000000000000000003af9a800"
+        act.error == null
+    }
+
+}