The <code>Test</code> annotation tells JUnit that the <code>public void</code> method
to which it is attached can be run as a test case. To run the method,
JUnit first constructs a fresh instance of the class then invokes the
annotated method. Any exceptions thrown by the test will be reported
by JUnit as a failure. If no exceptions are thrown, the test is assumed
to have succeeded.
<p>
A simple test looks like this:
<pre>
public class Example {
<b>@Test</b>
public void method() {
org.junit.Assert.assertTrue( new ArrayList().isEmpty() );
}
}
</pre>
<p>
The <code>Test</code> annotation supports two optional parameters.
The first, <code>expected</code>, declares that a test method should throw
an exception. If it doesn't throw an exception or if it throws a different exception
than the one declared, the test fails. For example, the following test succeeds:
<pre>
@Test(<b>expected=IndexOutOfBoundsException.class</b>) public void outOfBounds() {
new ArrayList<Object>().get(1);
}
</pre>
If the exception's message or one of its properties should be verified, the
{@link org.junit.rules.ExpectedException ExpectedException} rule can be used. Further
information about exception testing can be found at the
<a href="https://github.com/junit-team/junit/wiki/Exception-testing">JUnit Wiki</a>.
<p>
The second optional parameter, <code>timeout</code>, causes a test to fail if it takes
longer than a specified amount of clock time (measured in milliseconds). The following test fails:
<pre>
@Test(<b>timeout=100</b>) public void infinity() {
while(true);
}
</pre>
<b>Warning</b>: while <code>timeout</code> is useful to catch and terminate
infinite loops, it should <em>not</em> be considered deterministic. The
following test may or may not fail depending on how the operating system
schedules threads:
<pre>
@Test(<b>timeout=100</b>) public void sleep100() {
Thread.sleep(100);
}
</pre>
<b>THREAD SAFETY WARNING:</b> Test methods with a timeout parameter are run in a thread other than the
thread which runs the fixture's @Before and @After methods. This may yield different behavior for
code that is not thread safe when compared to the same test method without a timeout parameter.
<b>Consider using the {@link org.junit.rules.Timeout} rule instead</b>, which ensures a test method is run on the
same thread as the fixture's @Before and @After methods.
The <code>Test</code> annotation tells JUnit that the <code>public void</code> method to which it is attached can be run as a test case. To run the method, JUnit first constructs a fresh instance of the class then invokes the annotated method. Any exceptions thrown by the test will be reported by JUnit as a failure. If no exceptions are thrown, the test is assumed to have succeeded. <p> A simple test looks like this: <pre> public class Example { <b>@Test</b> public void method() { org.junit.Assert.assertTrue( new ArrayList().isEmpty() ); } } </pre> <p> The <code>Test</code> annotation supports two optional parameters. The first, <code>expected</code>, declares that a test method should throw an exception. If it doesn't throw an exception or if it throws a different exception than the one declared, the test fails. For example, the following test succeeds: <pre> @Test(<b>expected=IndexOutOfBoundsException.class</b>) public void outOfBounds() { new ArrayList<Object>().get(1); } </pre> If the exception's message or one of its properties should be verified, the {@link org.junit.rules.ExpectedException ExpectedException} rule can be used. Further information about exception testing can be found at the <a href="https://github.com/junit-team/junit/wiki/Exception-testing">JUnit Wiki</a>. <p> The second optional parameter, <code>timeout</code>, causes a test to fail if it takes longer than a specified amount of clock time (measured in milliseconds). The following test fails: <pre> @Test(<b>timeout=100</b>) public void infinity() { while(true); } </pre> <b>Warning</b>: while <code>timeout</code> is useful to catch and terminate infinite loops, it should <em>not</em> be considered deterministic. The following test may or may not fail depending on how the operating system schedules threads: <pre> @Test(<b>timeout=100</b>) public void sleep100() { Thread.sleep(100); } </pre> <b>THREAD SAFETY WARNING:</b> Test methods with a timeout parameter are run in a thread other than the thread which runs the fixture's @Before and @After methods. This may yield different behavior for code that is not thread safe when compared to the same test method without a timeout parameter. <b>Consider using the {@link org.junit.rules.Timeout} rule instead</b>, which ensures a test method is run on the same thread as the fixture's @Before and @After methods.