pkg/writer/writer_test.go

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 writer

import (
	"os"
	"path/filepath"
	"testing"
)

func TestWriteFileTruncatesExistingFile(t *testing.T) {
	path := filepath.Join(t.TempDir(), "file.txt")
	if err := os.WriteFile(path, []byte("123456"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := WriteFile(path, "abc"); err != nil {
		t.Fatal(err)
	}
	content, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if string(content) != "abc" {
		t.Fatalf("got %q, want %q", content, "abc")
	}
}