How to use createTestClass method of org.junit.runners.ParentRunner class

Best junit code snippet using org.junit.runners.ParentRunner.createTestClass

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...55 public abstract List<T> getChildren();56 /​* access modifiers changed from: protected */​57 public abstract void runChild(T t, RunNotifier runNotifier);58 protected ParentRunner(Class<?> testClass2) throws InitializationError {59 this.testClass = createTestClass(testClass2);60 validate();61 }62 /​* access modifiers changed from: protected */​63 public TestClass createTestClass(Class<?> testClass2) {64 return new TestClass(testClass2);65 }66 /​* access modifiers changed from: protected */​67 public void collectInitializationErrors(List<Throwable> errors) {68 validatePublicVoidNoArgMethods(BeforeClass.class, true, errors);69 validatePublicVoidNoArgMethods(AfterClass.class, true, errors);70 validateClassRules(errors);71 applyValidators(errors);72 }73 private void applyValidators(List<Throwable> errors) {74 if (getTestClass().getJavaClass() != null) {75 for (TestClassValidator each : VALIDATORS) {76 errors.addAll(each.validateTestClass(getTestClass()));77 }...

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...32 private ConcurrentHashMap<TestDescriptor, Description> testDescriptions = new ConcurrentHashMap<>();33 private final RuleTst instance;34 public RuleTestRunner(Class<? extends RuleTst> testClass) throws InitializationError {35 super(testClass);36 instance = createTestClass();37 instance.setUp();38 }39 @Override40 protected Description describeChild(TestDescriptor testCase) {41 Description description = testDescriptions.get(testCase);42 if (description == null) {43 description = Description.createTestDescription(getTestClass().getJavaClass(),44 testCase.getRule().getName() + "::"45 + testCase.getNumberInDocument() + " "46 + testCase.getDescription().replaceAll("\n|\r", " "));47 testDescriptions.putIfAbsent(testCase, description);48 }49 return description;50 }51 /​**52 * Checks whether this test class has additionally unit test methods.53 * @return true if there is at least one unit test method.54 */​55 public boolean hasUnitTests() {56 return !getTestClass().getAnnotatedMethods(Test.class).isEmpty();57 }58 @Override59 protected List<TestDescriptor> getChildren() {60 List<Rule> rules = new ArrayList<>(instance.getRules());61 Collections.sort(rules, new Comparator<Rule>() {62 @Override63 public int compare(Rule o1, Rule o2) {64 return o1.getName().compareTo(o2.getName());65 }66 });67 List<TestDescriptor> tests = new LinkedList<>();68 for (Rule r : rules) {69 TestDescriptor[] ruleTests = instance.extractTestsFromXml(r);70 for (TestDescriptor t : ruleTests) {71 tests.add(t);72 }73 }74 return tests;75 }76 private RuleTst createTestClass() throws InitializationError {77 try {78 return (RuleTst) getTestClass().getOnlyConstructor().newInstance();79 } catch (Exception e) {80 throw new InitializationError(e);81 }82 }83 @Override84 protected void runChild(TestDescriptor testCase, RunNotifier notifier) {85 Description description = describeChild(testCase);86 if (isIgnored(testCase)) {87 notifier.fireTestIgnored(description);88 } else {89 runLeaf(ruleTestBlock(testCase), description, notifier);90 }...

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createTestClass

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1import static org.junit.Assert.assertEquals;2import org.junit.Test;3import org.junit.runner.RunWith;4import org.junit.runners.ParentRunner;5@RunWith(ParentRunner.class)6public class MyClassTest {7 public void testMyMethod(){8 MyClass obj = new MyClass();9 assertEquals(2, obj.myMethod());10 }11}

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createTestClass

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1import org.junit.runner.JUnitCore;2import org.junit.runner.Result;3import org.junit.runner.notification.Failure;4public class TestRunner {5 public static void main(String[] args) {6 Result result = JUnitCore.runClasses(TestJunit.class);7 for (Failure failure : result.getFailures()) {8 System.out.println(failure.toString());9 }10 System.out.println(result.wasSuccessful());11 }12}13 at org.junit.Assert.fail(Assert.java:88)14 at org.junit.Assert.failNotEquals(Assert.java:834)15 at org.junit.Assert.assertEquals(Assert.java:645)16 at org.junit.Assert.assertEquals(Assert.java:631)17 at TestJunit.testAdd(TestJunit.java:8)18 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)19 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)20 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)21 at java.lang.reflect.Method.invoke(Method.java:498)22 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)23 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)24 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)25 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)26 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)27 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)28 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)29 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)30 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)31 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)32 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)33 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)34 at org.junit.runners.ParentRunner.run(ParentRunner.java:363

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If you add in Hamcrest and JUnit4, you could do:

String x = "foo bar";
Assert.assertThat(x, CoreMatchers.containsString("foo"));

With some static imports, it looks a lot better:

assertThat(x, containsString("foo"));

The static imports needed would be:

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.CoreMatchers.containsString;
https://stackoverflow.com/questions/1092219/assertcontains-on-strings-in-junit

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This article is a part of our Content Hub. For more in-depth resources, check out our content hub on JUnit Tutorial.

JUnit Tutorial:

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