AssertEquals(String, String) ComparisonFailure whe

Question

I'm facing the following scenario:

I have an app that spits everything out to the STDOUT (simple company test) and I'm trying to JUnit this.

My problem is, when I run the application, it returns me in the Console: (copy and pasted from IntelliJ)

Id 1234 nao encontrado
123, R$ 441,00
321, R$ -8490,00
255, R$ 884,00

Print:

And my test is:

assertEquals(outContent.toString().trim(),"Id 1234 nao encontrado\n" +
                "123, R$ 441,00\n" +
                "321, R$ -8490,00\n" +
                "255, R$ 884,00");

I'm getting:

junit.framework.ComparisonFailure:  <Click to see difference>


    at junit.framework.Assert.assertEquals(Assert.java:100)
    at junit.framework.Assert.assertEquals(Assert.java:107)
    at junit.framework.TestCase.assertEquals(TestCase.java:269)
    at com.company.AccountManagerTest.testPrintAccountsBalance(AccountManagerTest.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at junit.framework.TestCase.runTest(TestCase.java:176)
    at junit.framework.TestCase.runBare(TestCase.java:141)
    at junit.framework.TestResult$1.protect(TestResult.java:122)
    at junit.framework.TestResult.runProtected(TestResult.java:142)
    at junit.framework.TestResult.run(TestResult.java:125)
    at junit.framework.TestCase.run(TestCase.java:129)
    at junit.framework.TestSuite.runTest(TestSuite.java:252)
    at junit.framework.TestSuite.run(TestSuite.java:247)
    at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:86)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

So, what I am doing wrong here ?

Testing with JUnit4 and assertJ 2.4.0

Answer 1

The visible characters are identical, but the non-printable characters are not.

You are comparing expected output containing CRLF (\r\n) to actual output with just LF (\n). You can see that in IntelliJ above the right-hand side of both text areas.

Simple solution is to replace the \n's in your string with \r\n. Or remove \r from the other.

---

It is also worth noting that the parameter ordering is actually (Object expected, Object actual), so the outContent should go second since that is the "actual" output.

Answer 2

You can use AssertJ "isEqualToNormalizingNewline" as in:

import static org.assertj.core.api.Assertions.assertThat;

...

@Test
public void ingoreLineEndingCharacterTest() {
    assertThat("First Line\nSecond Line\n").isEqualToNormalizingNewlines("First Line\r\nSecond Line\r\n");
}