AssertEquals(String, String) ComparisonFailure when contents are identical

问题

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

回答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.

回答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");
}

来源：https://stackoverflow.com/questions/36324452/assertequalsstring-string-comparisonfailure-when-contents-are-identical

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java

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junit4