forked from junit-team/junit4
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MethodRulesTest.java
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MethodRulesTest.java
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package org.junit.tests.experimental.rules;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.junit.experimental.results.PrintableResult.testResult;
import static org.junit.experimental.results.ResultMatchers.hasSingleFailureContaining;
import static org.junit.experimental.results.ResultMatchers.isSuccessful;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.MethodRule;
import org.junit.rules.TestName;
import org.junit.rules.TestRule;
import org.junit.rules.TestWatchman;
import org.junit.runner.Description;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.Statement;
@SuppressWarnings("deprecation")
public class MethodRulesTest {
private static boolean wasRun;
public static class ExampleTest {
@Rule
public MethodRule example= new MethodRule() {
public Statement apply(final Statement base,
FrameworkMethod method, Object target) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
wasRun= true;
base.evaluate();
};
};
}
};
@Test
public void nothing() {
}
}
@Test
public void ruleIsIntroducedAndEvaluated() {
wasRun= false;
JUnitCore.runClasses(ExampleTest.class);
assertTrue(wasRun);
}
public static class SonOfExampleTest extends ExampleTest {
}
@Test
public void ruleIsIntroducedAndEvaluatedOnSubclass() {
wasRun= false;
JUnitCore.runClasses(SonOfExampleTest.class);
assertTrue(wasRun);
}
private static int runCount;
public static class MultipleRuleTest {
private static class Increment implements MethodRule {
public Statement apply(final Statement base,
FrameworkMethod method, Object target) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
runCount++;
base.evaluate();
};
};
}
}
@Rule
public MethodRule incrementor1= new Increment();
@Rule
public MethodRule incrementor2= new Increment();
@Test
public void nothing() {
}
}
@Test
public void multipleRulesAreRun() {
runCount= 0;
JUnitCore.runClasses(MultipleRuleTest.class);
assertEquals(2, runCount);
}
public static class NoRulesTest {
public int x;
@Test
public void nothing() {
}
}
@Test
public void ignoreNonRules() {
Result result= JUnitCore.runClasses(NoRulesTest.class);
assertEquals(0, result.getFailureCount());
}
private static String log;
public static class OnFailureTest {
@Rule
public MethodRule watchman= new TestWatchman() {
@Override
public void failed(Throwable e, FrameworkMethod method) {
log+= method.getName() + " " + e.getClass().getSimpleName();
}
};
@Test
public void nothing() {
fail();
}
}
@Test
public void onFailure() {
log= "";
Result result= JUnitCore.runClasses(OnFailureTest.class);
assertEquals("nothing AssertionError", log);
assertEquals(1, result.getFailureCount());
}
public static class WatchmanTest {
private static String watchedLog;
@Rule
public MethodRule watchman= new TestWatchman() {
@Override
public void failed(Throwable e, FrameworkMethod method) {
watchedLog+= method.getName() + " "
+ e.getClass().getSimpleName() + "\n";
}
@Override
public void succeeded(FrameworkMethod method) {
watchedLog+= method.getName() + " " + "success!\n";
}
};
@Test
public void fails() {
fail();
}
@Test
public void succeeds() {
}
}
@Test
public void succeeded() {
WatchmanTest.watchedLog= "";
JUnitCore.runClasses(WatchmanTest.class);
assertThat(WatchmanTest.watchedLog, containsString("fails AssertionError"));
assertThat(WatchmanTest.watchedLog, containsString("succeeds success!"));
}
public static class BeforesAndAfters {
private static String watchedLog;
@Before public void before() {
watchedLog+= "before ";
}
@Rule
public MethodRule watchman= new TestWatchman() {
@Override
public void starting(FrameworkMethod method) {
watchedLog+= "starting ";
}
@Override
public void finished(FrameworkMethod method) {
watchedLog+= "finished ";
}
@Override
public void succeeded(FrameworkMethod method) {
watchedLog+= "succeeded ";
}
};
@After public void after() {
watchedLog+= "after ";
}
@Test
public void succeeds() {
watchedLog+= "test ";
}
}
@Test
public void beforesAndAfters() {
BeforesAndAfters.watchedLog= "";
JUnitCore.runClasses(BeforesAndAfters.class);
assertThat(BeforesAndAfters.watchedLog, is("starting before test after succeeded finished "));
}
public static class WrongTypedField {
@Rule public int x = 5;
@Test public void foo() {}
}
@Test public void validateWrongTypedField() {
assertThat(testResult(WrongTypedField.class),
hasSingleFailureContaining("must implement MethodRule"));
}
public static class SonOfWrongTypedField extends WrongTypedField {
}
@Test public void validateWrongTypedFieldInSuperclass() {
assertThat(testResult(SonOfWrongTypedField.class),
hasSingleFailureContaining("must implement MethodRule"));
}
public static class PrivateRule {
@SuppressWarnings("unused")
@Rule private TestRule rule = new TestName();
@Test public void foo() {}
}
@Test public void validatePrivateRule() {
assertThat(testResult(PrivateRule.class),
hasSingleFailureContaining("must be public"));
}
public static class CustomTestName implements TestRule {
public String name = null;
public Statement apply(final Statement base, final Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
name = description.getMethodName();
base.evaluate();
}
};
}
}
public static class UsesCustomMethodRule {
@Rule public CustomTestName counter = new CustomTestName();
@Test public void foo() {
assertEquals("foo", counter.name);
}
}
@Test public void useCustomMethodRule() {
assertThat(testResult(UsesCustomMethodRule.class), isSuccessful());
}
}