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OutputTest.java
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OutputTest.java
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package nl.jqno.equalsverifier.integration.operational;
import nl.jqno.equalsverifier.EqualsVerifier;
import nl.jqno.equalsverifier.internal.exceptions.AssertionException;
import nl.jqno.equalsverifier.internal.util.Formatter;
import nl.jqno.equalsverifier.testhelpers.ExpectedException;
import nl.jqno.equalsverifier.testhelpers.packages.correct.A;
import nl.jqno.equalsverifier.testhelpers.types.Point;
import nl.jqno.equalsverifier.testhelpers.types.RecursiveTypeHelper.Node;
import org.junit.jupiter.api.Test;
public class OutputTest {
private static final String SEE_ALSO = "For more information, go to";
private static final String WEBSITE_URL = "https://www.jqno.nl/equalsverifier/errormessages";
private static final String MESSAGE = "a message for an exception";
@Test
public void messageIsValidForSingleType_whenEqualsVerifierFails_givenExceptionIsGeneratedByEqualsVerifierItself() {
ExpectedException
.when(() -> EqualsVerifier.forClass(Point.class).verify())
.assertCause(AssertionException.class)
.assertMessageContains(Point.class.getSimpleName(), SEE_ALSO, WEBSITE_URL);
}
@Test
public void messageIsValidForMultipleTypes_whenEqualsVerifierFails_givenExceptionIsGeneratedByEqualsVerifierItself() {
ExpectedException
.when(() -> EqualsVerifier.forClasses(A.class, Point.class).verify())
.assertMessageContains(Point.class.getSimpleName(), SEE_ALSO, WEBSITE_URL, "---");
}
@Test
public void errorDescriptionAppearsOnlyAtTopOfStacktrace_notInOneOfItsCauses() {
ExpectedException
.when(() -> EqualsVerifier.forClass(Point.class).verify())
.assertMessageContains("Subclass")
.assertCauseMessageDoesNotContain("Subclass");
}
@Test
public void messageIsValidAndCauseHasCause_whenEqualsVerifierFails_givenOriginalExceptionHasACause() {
ExpectedException
.when(() -> EqualsVerifier.forClass(AssertionExceptionWithCauseThrower.class).verify())
.assertMessageContains(AssertionExceptionWithCauseThrower.class.getSimpleName())
.assertMessageContains(SEE_ALSO, WEBSITE_URL, MESSAGE)
.assertMessageDoesNotContain(NullPointerException.class.getSimpleName())
.assertCause(AssertionException.class)
.assertCause(NullPointerException.class);
}
@Test
public void originalMessageIsPresentInOutput_whenEqualsVerifierFails_givenOriginalExceptionHasAMessage() {
ExpectedException
.when(() ->
EqualsVerifier
.forClass(UnsupportedOperationExceptionWithMessageThrower.class)
.verify()
)
.assertMessageContains(
UnsupportedOperationExceptionWithMessageThrower.class.getSimpleName()
)
.assertMessageContains(UnsupportedOperationException.class.getSimpleName())
.assertMessageContains(SEE_ALSO, WEBSITE_URL, MESSAGE)
.assertMessageDoesNotContain("null")
.assertCause(UnsupportedOperationException.class)
.assertCauseMessageContains(MESSAGE);
}
@Test
public void messageIsValidAndDoesNotContainStringNull_whenEqualsVerifierFails_givenOriginalExceptionIsBare() {
ExpectedException
.when(() -> EqualsVerifier.forClass(IllegalStateExceptionThrower.class).verify())
.assertMessageContains(IllegalStateExceptionThrower.class.getSimpleName())
.assertMessageContains(SEE_ALSO, WEBSITE_URL, "<no message>")
.assertMessageDoesNotContain("null")
.assertCause(IllegalStateException.class);
}
@Test
public void noStackOverflowErrorIsThrown_whenClassIsARecursiveDatastructure() {
ExpectedException
.when(() -> EqualsVerifier.forClass(Node.class).verify())
.assertMessageContains(Node.class.getSimpleName(), SEE_ALSO, WEBSITE_URL)
.assertNotCause(StackOverflowError.class);
}
private static class AssertionExceptionWithCauseThrower {
@Override
public boolean equals(Object obj) {
Throwable cause = new NullPointerException();
throw new AssertionException(Formatter.of(MESSAGE), cause);
}
}
private static class UnsupportedOperationExceptionWithMessageThrower {
@Override
public boolean equals(Object obj) {
throw new UnsupportedOperationException(MESSAGE);
}
}
private static class IllegalStateExceptionThrower {
@Override
public boolean equals(Object obj) {
throw new IllegalStateException();
}
}
}