cmd/ethtest, tests: add support for RLP JSON tests

tests/rlp_test.go

@@ -0,0 +1,20 @@
+package tests
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestRLP(t *testing.T) {
+	err := RunRLPTest(filepath.Join(rlpTestDir, "rlptest.json"), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestRLP_invalid(t *testing.T) {
+	err := RunRLPTest(filepath.Join(rlpTestDir, "invalidRLPTest.json"), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+}