Why are there brackets after my String's value?

Question

I have a test like this:

String dir = "/foo";
String fileName = "hello.txt";
String pathString = dir + "/" + fileName;
String text = "hello world!";
MyTask task = new MyTask();

FileSystem fs = Jimfs.newFileSystem(Configuration.unix());

Path foo = fs.getPath(dir);
Files.createDirectory(foo);
Path hello = foo.resolve(fileName);
Files.write(hello, ImmutableList.of(text), StandardCharsets.UTF_8);

task.setFileSystem(fs);
String fileValue = task.readFile(pathString);

// Doing this just shows "fail whale: hello world!"
// fail("fail whale: " + fileValue); 

// Failure from here adds brackets
assertEquals(text, fileValue);

I get a failure like this:

org.junit.ComparisonFailure: expected: but was:

If I reverse the arguments, I can see that readFile is definitely creating that new line, and it's not just my terminal truncating.

I have no idea why JUnit is showing brackets after my string at all, and am even more confused as to why a space would get added.

readFile is simply this:

public String readFile(String path) {
  try {
    return new String(Files.readAllBytes(fs.getPath(path)));
  } catch (Exception e) {
    e.printStackTrace();
    return "";
  }
}

Java: Is assertEquals(String, String) reliable? makes reference of the String being an Object, but if that is the case, an the brackets just imply Object, still really confused about that new line.

Why are there brackets after my String's value?

2 Answers