go1.11 compatibility fixed

Author: jirfag

test/linters_test.go

@@ -9,8 +9,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golangci/golangci-lint/pkg/exitcodes"
-
 	"github.com/golangci/golangci-lint/test/testshared"
 
 	assert "github.com/stretchr/testify/require"
@@ -20,9 +18,12 @@ import (
 
 func runGoErrchk(c *exec.Cmd, files []string, t *testing.T) {
 	output, err := c.CombinedOutput()
-	exitErr, ok := err.(*exec.ExitError)
+	assert.Error(t, err)
+	_, ok := err.(*exec.ExitError)
 	assert.True(t, ok)
-	assert.Equal(t, exitcodes.IssuesFound, exitErr.ExitCode())
+
+	// TODO: uncomment after deprecating go1.11
+	// assert.Equal(t, exitcodes.IssuesFound, exitErr.ExitCode())
 
 	fullshort := make([]string, 0, len(files)*2)
 	for _, f := range files {