org.junit.rules
public class ExpectedException extends Object implements TestRule
// These tests all pass. public static class HasExpectedException { @Rule public ExpectedException thrown= ExpectedException.none(); @Test public void throwsNothing() { // no exception expected, none thrown: passes. } @Test public void throwsNullPointerException() { thrown.expect(NullPointerException.class); throw new NullPointerException(); } @Test public void throwsNullPointerExceptionWithMessage() { thrown.expect(NullPointerException.class); thrown.expectMessage("happened?"); thrown.expectMessage(startsWith("What")); throw new NullPointerException("What happened?"); } }
Modifier and Type | Method and Description |
---|---|
Statement |
apply(Statement base,
Description description)
Modifies the method-running
Statement to implement this
test-running rule. |
void |
expect(Class<? extends Throwable> type)
Adds to the list of requirements for any thrown exception that it
should be an instance of
type |
void |
expect(Matcher<?> matcher)
Adds
matcher to the list of requirements for any thrown exception. |
void |
expectMessage(Matcher<String> matcher)
Adds
matcher to the list of requirements for the message
returned from any thrown exception. |
void |
expectMessage(String substring)
Adds to the list of requirements for any thrown exception that it
should contain string
substring |
static ExpectedException |
none() |
public static ExpectedException none()
public Statement apply(Statement base, Description description)
TestRule
Statement
to implement this
test-running rule.apply
in interface TestRule
base
- The Statement
to be modifieddescription
- A Description
of the test implemented in base
base
,
a wrapper around base
, or a completely new Statement.public void expect(Matcher<?> matcher)
matcher
to the list of requirements for any thrown exception.public void expect(Class<? extends Throwable> type)
type
public void expectMessage(String substring)
substring