Best junit code snippet using org.junit.runner.manipulation.Interface Orderable
Source: JUnit4TestAdapter.java
1package junit.framework;2import java.util.List;3import org.junit.Ignore;4import org.junit.runner.Describable;5import org.junit.runner.Description;6import org.junit.runner.Request;7import org.junit.runner.Runner;8import org.junit.runner.manipulation.Filter;9import org.junit.runner.manipulation.Filterable;10import org.junit.runner.manipulation.Orderer;11import org.junit.runner.manipulation.InvalidOrderingException;12import org.junit.runner.manipulation.NoTestsRemainException;13import org.junit.runner.manipulation.Orderable;14import org.junit.runner.manipulation.Sorter;15/**16 * The JUnit4TestAdapter enables running JUnit-4-style tests using a JUnit-3-style test runner.17 *18 * <p> To use it, add the following to a test class:19 * <pre>20 public static Test suite() {21 return new JUnit4TestAdapter(<em>YourJUnit4TestClass</em>.class);22 }23</pre>24 */25public class JUnit4TestAdapter implements Test, Filterable, Orderable, Describable {26 private final Class<?> fNewTestClass;27 private final Runner fRunner;28 private final JUnit4TestAdapterCache fCache;29 public JUnit4TestAdapter(Class<?> newTestClass) {30 this(newTestClass, JUnit4TestAdapterCache.getDefault());31 }32 public JUnit4TestAdapter(final Class<?> newTestClass, JUnit4TestAdapterCache cache) {33 fCache = cache;34 fNewTestClass = newTestClass;35 fRunner = Request.classWithoutSuiteMethod(newTestClass).getRunner();36 }37 public int countTestCases() {38 return fRunner.testCount();39 }40 public void run(TestResult result) {41 fRunner.run(fCache.getNotifier(result, this));42 }43 // reflective interface for Eclipse44 public List<Test> getTests() {45 return fCache.asTestList(getDescription());46 }47 // reflective interface for Eclipse48 public Class<?> getTestClass() {49 return fNewTestClass;50 }51 public Description getDescription() {52 Description description = fRunner.getDescription();53 return removeIgnored(description);54 }55 private Description removeIgnored(Description description) {56 if (isIgnored(description)) {57 return Description.EMPTY;58 }59 Description result = description.childlessCopy();60 for (Description each : description.getChildren()) {61 Description child = removeIgnored(each);62 if (!child.isEmpty()) {63 result.addChild(child);64 }65 }66 return result;67 }68 private boolean isIgnored(Description description) {69 return description.getAnnotation(Ignore.class) != null;70 }71 @Override72 public String toString() {73 return fNewTestClass.getName();74 }75 public void filter(Filter filter) throws NoTestsRemainException {76 filter.apply(fRunner);77 }78 public void sort(Sorter sorter) {79 sorter.apply(fRunner);80 }81 /**82 * {@inheritDoc}83 *84 * @since 4.1385 */86 public void order(Orderer orderer) throws InvalidOrderingException {87 orderer.apply(fRunner);88 }89}...
Interface Orderable
Using AI Code Generation
1import org.junit.runner.manipulation.Orderable;2import org.junit.runner.manipulation.Sorter;3import org.junit.runner.Description;4import org.junit.runner.Runner;5import org.junit.runner.notification.RunNotifier;6import org.junit.runners.Suite;7import org.junit.runners.model.InitializationError;8import org.junit.runners.model.RunnerBuilder;9import java.util.Comparator;10import java.util.List;11import java.util.ArrayList;12public class OrderedRunner extends Suite {13 private static class TestClassComparator implements Comparator<Class<?>> {14 public int compare(Class<?> o1, Class<?> o2) {15 return o1.getName().compareTo(o2.getName());16 }17 }18 public OrderedRunner(Class<?> klass, RunnerBuilder builder) throws InitializationError {19 super(klass, builder);20 List<Runner> runners = new ArrayList<Runner>();21 runners.addAll(getChildren());22 Sorter sorter = new Sorter(new TestClassComparator());23 sorter.apply(runners);24 setChildren(runners);25 }26 protected Description describeChild(Runner child) {27 return child.getDescription();28 }29 protected void runChild(Runner child, RunNotifier notifier) {30 child.run(notifier);31 }32}33import org.junit.runner.manipulation.Orderable;34import org.junit.runner.manipulation.Sorter;35import org.junit.runner.Description;36import org.junit.runner.Runner;37import org.junit.runner.notification.RunNotifier;38import org.junit.runners.Suite;39import org.junit.runners.model.InitializationError;40import org.junit.runners.model.RunnerBuilder;41import java.util.Comparator;42import java.util.List;43import java.util.ArrayList;44public class OrderedRunner extends Suite {45 private static class TestClassComparator implements Comparator<Class<?>> {46 public int compare(Class<?> o1, Class<?> o2) {47 return o1.getName().compareTo(o2.getName());48 }49 }50 public OrderedRunner(Class<?> klass, RunnerBuilder builder) throws InitializationError {51 super(klass, builder);52 List<Runner> runners = new ArrayList<Runner>();53 runners.addAll(getChildren());54 Sorter sorter = new Sorter(new TestClassComparator());55 sorter.apply(runners);56 setChildren(runners);57 }58 protected Description describeChild(Runner child) {59 return child.getDescription();60 }61 protected void runChild(Runner child, RunNotifier notifier) {
Interface Orderable
Using AI Code Generation
1import org.junit.runner.Description;2import org.junit.runner.manipulation.Orderable;3import org.junit.runner.manipulation.Sorter;4public class OrderableExample implements Orderable {5 public void apply(Object child) {6 }7 public void orderChildren(Sorter sorter) {8 }9 public Description getDescription() {10 return null;11 }12}
Interface Orderable
Using AI Code Generation
1import org.junit.runner.manipulation.*;2public class TestOrder implements Orderable {3 public void orderTestMethods(MethodSorter sorter) {4 sorter.apply(this);5 }6}7import org.junit.runner.*;8public class TestOrder implements Runner {9 public void orderTestMethods(MethodSorter sorter) {10 sorter.apply(this);11 }12}13import org.junit.runner.*;14public class TestOrder implements Test {15 public void orderTestMethods(MethodSorter sorter) {16 sorter.apply(this);17 }18}19import org.junit.runner.manipulation.*;20public class TestOrder implements Filterable {21 public void orderTestMethods(MethodSorter sorter) {22 sorter.apply(this);23 }24}25import org.junit.runner.manipulation.*;26public class TestOrder implements Sortable {27 public void orderTestMethods(MethodSorter sorter) {28 sorter.apply(this);29 }30}31import org.junit.runner.manipulation.*;32public class TestOrder implements Sorter {33 public void orderTestMethods(MethodSorter sorter) {34 sorter.apply(this);35 }36}37import org.junit.runner.*;38public class TestOrder implements Request {39 public void orderTestMethods(MethodSorter sorter) {40 sorter.apply(this);41 }42}43import org.junit.runner.*;44public class TestOrder implements Filter {45 public void orderTestMethods(MethodSorter sorter) {46 sorter.apply(this);47 }48}49import org.junit.runner.*;50public class TestOrder implements FilterFactory {51 public void orderTestMethods(MethodSorter sorter) {
Interface Orderable
Using AI Code Generation
1import org.junit.runner.manipulation.*;2import org.junit.runner.*;3public class SorterOrderer implements Orderable {4 public void apply(Object child) {5 }6 public void sort(Sorter sorter) {7 }8 public static void main(String[] args) {9 Orderer orderer = new Orderer(new SorterOrderer());10 Sorter sorter = new Sorter(orderer);11 }12}13[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project junit-compiler: Compilation failure: Compilation failure:14[ERROR] /home/ram/Documents/Java/Java-Projects/junit-compiler/src/test/java/com/ram/junit/SorterOrderer.java:[12,8] error: SorterOrderer is not abstract and does not override abstract method apply(java.lang.Object) in Orderable15[ERROR] /home/ram/Documents/Java/Java-Projects/junit-compiler/src/test/java/com/ram/junit/SorterOrderer.java:[12,8] error: SorterOrderer is not abstract and does not override abstract method sort(Sorter) in Orderable16[ERROR] /home/ram/Documents/Java/Java-Projects/junit-compiler/src/test/java/com/ram/junit/SorterOrderer.java:[20,8] error: SorterOrderer is not abstract and does not override abstract method apply(java.lang.Object) in Orderable
Interface Orderable
Using AI Code Generation
1import org.junit.runner.manipulation.Orderable;2import org.junit.runner.manipulation.TestRequest;3import org.junit.runner.manipulation.TestSorter;4import org.junit.runner.manipulation.Ordering;5import org.junit.runner.Description;6import org.junit.runner.Request;7import org.junit.runner.JUnitCore;8import org.junit.runner.notification.RunListener;9import org.junit.runner.notification.RunNotifier;10import org.junit.runner.notification.Failure;
JUnit 4 Expected Exception type
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Best way to automagically migrate tests from JUnit 3 to JUnit 4?
There's actually an alternative to the @Test(expected=Xyz.class)
in JUnit 4.7 using Rule
and ExpectedException
In your test case you declare an ExpectedException
annotated with @Rule
, and assign it a default value of ExpectedException.none()
. Then in your test that expects an exception you replace the value with the actual expected value. The advantage of this is that without using the ugly try/catch method, you can further specify what the message within the exception was
@Rule public ExpectedException thrown= ExpectedException.none();
@Test
public void myTest() {
thrown.expect( Exception.class );
thrown.expectMessage("Init Gold must be >= 0");
rodgers = new Pirate("Dread Pirate Rodgers" , -100);
}
Using this method, you might be able to test for the message in the generic exception to be something specific.
ADDITION
Another advantage of using ExpectedException
is that you can more precisely scope the exception within the context of the test case. If you are only using @Test(expected=Xyz.class)
annotation on the test, then the Xyz exception can be thrown anywhere in the test code -- including any test setup or pre-asserts within the test method. This can lead to a false positive.
Using ExpectedException, you can defer specifying the thrown.expect(Xyz.class)
until after any setup and pre-asserts, just prior to actually invoking the method under test. Thus, you more accurately scope the exception to be thrown by the actual method invocation rather than any of the test fixture itself.
JUnit 5 NOTE:
JUnit 5 JUnit Jupiter has removed @Test(expected=...)
, @Rule
and ExpectedException
altogether. They are replaced with the new assertThrows()
, which requires the use of Java 8 and lambda syntax. ExpectedException
is still available for use in JUnit 5 through JUnit Vintage. Also JUnit Jupiter will also continue to support JUnit 4 ExpectedException
through use of the junit-jupiter-migrationsupport module, but only if you add an additional class-level annotation of @EnableRuleMigrationSupport
.
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