Error handler test

.github/workflows/go.yml

@@ -18,7 +18,6 @@ jobs:
       matrix:
         go-version:
           - '1.22'
-
     steps:
 
     - name: Set up Go ${{ matrix.go-version }}

internal/cli/errors_test.go

@@ -0,0 +1,84 @@
+/*
+ Copyright 2024 The Knative Authors
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+package cli_test
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"path"
+	"testing"
+
+	"github.com/spf13/cobra"
+	"github.com/stretchr/testify/require"
+	"github.com/wavesoftware/go-commandline"
+	"gotest.tools/v3/assert"
+	outlogging "knative.dev/client/pkg/output/logging"
+	"knative.dev/kn-plugin-event/internal/cli"
+	"knative.dev/kn-plugin-event/pkg/errors"
+)
+
+var errFoo = errors.New("foo")
+
+func TestErrorHandler(t *testing.T) {
+	t.Parallel()
+	cmd := &cobra.Command{
+		Use:           "example",
+		SilenceErrors: true,
+		SilenceUsage:  true,
+		RunE: func(_ *cobra.Command, _ []string) error {
+			return errors.Wrap(errFoo, cli.ErrCantBePresented)
+		},
+	}
+	logfilePath := path.Join(os.TempDir(), "log.jsonl")
+	const fileMode = 0o600
+	logfile, err := os.OpenFile(logfilePath, os.O_CREATE, fileMode)
+	require.NoError(t, err)
+	defer func(logfile *os.File) {
+		_ = logfile.Close()
+	}(logfile)
+	ctx := outlogging.WithLogFile(context.TODO(), logfile)
+	cmd.SetContext(ctx)
+	errBuf := bytes.NewBufferString("")
+	cmd.SetErr(errBuf)
+	var gotCode *int
+	opts := append(
+		cli.EffectiveOptions(),
+		commandline.WithExit(func(code int) {
+			gotCode = &code
+		}),
+	)
+	commandline.New(app{cmd}).ExecuteOrDie(opts...)
+	assert.Check(t, gotCode != nil)
+	assert.Equal(t, *gotCode, 227)
+	wantErrorOutput := `🔥 Error: can't be presented
+  └─ caused by: foo
+`
+	wantErrorOutput += `
+🌟 Hint: The execution logs could help debug the failure.
+         Consider, taking a look at the log file: `
+	wantErrorOutput += logfilePath + "\n"
+	assert.Equal(t, wantErrorOutput, errBuf.String())
+}
+
+type app struct {
+	cmd *cobra.Command
+}
+
+func (a app) Command() *cobra.Command {
+	return a.cmd
+}