test(system): Introduce system tests - initial version heavily inspired by wasmd (#20013)

systemtests/rpc_client.go

@@ -0,0 +1,33 @@
+package systemtests
+
+import (
+	"context"
+	"testing"
+
+	client "github.com/cometbft/cometbft/rpc/client/http"
+	cmtypes "github.com/cometbft/cometbft/types"
+	"github.com/stretchr/testify/require"
+)
+
+// RPCClient is a test helper to interact with a node via the RPC endpoint.
+type RPCClient struct {
+	client *client.HTTP
+	t      *testing.T
+}
+
+// NewRPCClient constructor
+func NewRPCClient(t *testing.T, addr string) RPCClient {
+	t.Helper()
+	httpClient, err := client.New(addr, "/websocket")
+	require.NoError(t, err)
+	require.NoError(t, httpClient.Start())
+	t.Cleanup(func() { _ = httpClient.Stop() })
+	return RPCClient{client: httpClient, t: t}
+}
+
+// Validators returns list of validators
+func (r RPCClient) Validators() []*cmtypes.Validator {
+	v, err := r.client.Validators(context.Background(), nil, nil, nil)
+	require.NoError(r.t, err)
+	return v.Validators
+}