CODEWITHSUNDEEP
javajunit
Aneesh
Aneesh

Reputation: 29

How do we write JUnit for method which writes the output into a file?

My void method writes the matter into a file.How can I write a test method for it?

Upvotes: 1

Views: 109

Answers (1)

Oliver Charlesworth
Oliver Charlesworth

Reputation: 272707

Ideally, use dependency injection. Don't have your method create a file, have it take a Writer (or PrintWriter or whatever) instance. That way, you can have your test inject a mock Writer that allows it to capture the data being written.

If you aren't at liberty to modify your method, then you'll have to very carefully use your test class's @Before/@After methods to create an isolated environment for the file to be created in.

Upvotes: 9

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