func TestCopyWithContentType(t *testing.T) {
	client, err := minio.New("127.0.0.1:9000", &minio.Options{
		Creds:  credentials.NewStaticV4("minioadmin", "minioadmin", ""),
		Secure: false,
	})
	if err != nil {
		panic(err)
	}
	bucket := "unittest"
	ctx := context.Background()
	_ = client.MakeBucket(ctx, bucket, minio.MakeBucketOptions{})
	content := []byte("some text")
	if _, err := client.PutObject(ctx, bucket, "file1.txt", bytes.NewReader(content), int64(len(content)), minio.PutObjectOptions{ContentType: "text/plain"}); err != nil {
		panic(err)
	}
	uploadedInfo, err := client.StatObject(ctx, bucket, "file1.txt", minio.StatObjectOptions{})
	if err != nil {
		panic(err)
	}
        // Replacing the Metadata is important to cause this issue
	if _, err := client.CopyObject(ctx, minio.CopyDestOptions{Bucket: bucket, Object: "file2.txt", UserMetadata: uploadedInfo.UserMetadata, ReplaceMetadata: true}, minio.CopySrcOptions{Bucket: bucket, Object: "file1.txt"}); err != nil {
		panic(err)
	}
	copiedInfo, err := client.StatObject(ctx, bucket, "file2.txt", minio.StatObjectOptions{})
	if err != nil {
		panic(err)
	}
	if uploadedInfo.ContentType != copiedInfo.ContentType { // text/plain != binary/octet-stream
		t.FailNow()
	}
}