What is the correct way to use common methods for unit tests?

Question

Java

There are several classes with Unit tests. In each class, tests should use the method of reading from files

private String readFromFile(String fileName){
...
  return result;
}

Where and how to correctly move this method so that it is common for test classes? What is the correct approach to solve such problems?
Thanks in advance.

Answer 1

The readFromFile method is done with default access:

String readFromFile(String fileName){
...
  return result;
}

And the JUnit test itself is placed in the same package as the class under test, so that it has access to the readFromFile
method src/main/java/ com/demo/file /FileReader.java
src/test/java/ com/demo/file / TestFileReader.java