Mocking InputStream, InputStreamReader and BufferedReader

Question

I have the following piece of code :

InputStream inputStream = sftpConfig.getSftpChannel().get(fileAbsolutePath);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)))
String line = bufferedReader.readLine();

All I want is to mock these lines, and be flexible in bufferedReader.readLine(), because I will have several test cases depending on the lines (a case where the file is empty and the line is null, a case where I get only one line, a case where I get several etc.).

Note : I am using jsch library for accessing files on FTP servers, so the method getSftpChannel() has ChannelSftp as return type, and get(fileAbsolutePath) has InputStream.

I am using junit 4.12 and mockito 3.1.0

Thanks in advance!

Alex · Accepted Answer · 2022-04-26 15:30:32Z

2

It's probably easier just to instantiate ByteArrayInputStream instance instead of mocking it and filling it with data you need, e.g.

var stream = new ByteArrayInputStream("hello".getBytes());

and you can just use that in place of your InputStream.

answered Apr 26, 2022 at 15:30

Alex

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