From 6cdb701a9d823039947c1478dd7991ec64480673 Mon Sep 17 00:00:00 2001
From: Anna Shaleva <anna@nspcc.ru>
Date: Mon, 29 Nov 2021 11:09:39 +0300
Subject: [PATCH] vm: improve error message for (*executor).checkError

It is helpful if something goes wrong.
---
 pkg/vm/cli/cli_test.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkg/vm/cli/cli_test.go b/pkg/vm/cli/cli_test.go
index 3d3761614..654a36a84 100644
--- a/pkg/vm/cli/cli_test.go
+++ b/pkg/vm/cli/cli_test.go
@@ -104,7 +104,8 @@ func (e *executor) checkNextLine(t *testing.T, expected string) {
 func (e *executor) checkError(t *testing.T, expectedErr error) {
 	line, err := e.out.ReadString('\n')
 	require.NoError(t, err)
-	require.True(t, strings.HasPrefix(line, "Error: "+expectedErr.Error()))
+	expected := "Error: " + expectedErr.Error()
+	require.True(t, strings.HasPrefix(line, expected), fmt.Errorf("expected `%s`, got `%s`", expected, line))
 }
 
 func (e *executor) checkStack(t *testing.T, items ...interface{}) {