Best junit code snippet using org.junit.rules.ErrorCollector.checkSucceeds
Source: ErrorCollectorTest.java
...167 @Rule168 public ErrorCollector collector = new ErrorCollector();169 @Test170 public void example() {171 collector.checkSucceeds(new Callable<Object>() {172 public Object call() throws Exception {173 throw new RuntimeException("first!");174 }175 });176 }177 }178 public static class CheckTwoCallablesThatThrowExceptions {179 @Rule180 public ErrorCollector collector = new ErrorCollector();181 @Test182 public void example() {183 collector.checkSucceeds(new Callable<Object>() {184 public Object call() throws Exception {185 throw new RuntimeException("first!");186 }187 });188 collector.checkSucceeds(new Callable<Integer>() {189 public Integer call() throws Exception {190 throw new RuntimeException("second!");191 }192 });193 }194 }195 public static class CheckCallableThatThrowsInternalAssumptionViolatedException {196 @Rule197 public ErrorCollector collector = new ErrorCollector();198 @Test199 public void example() {200 collector.checkSucceeds(new Callable<Object>() {201 public Object call() throws Exception {202 throw new AssumptionViolatedException("message");203 }204 });205 }206 }207 public static class CheckCallableWithFailingAssumption {208 @Rule209 public ErrorCollector collector = new ErrorCollector();210 @Test211 public void example() {212 collector.checkSucceeds(new Callable<Object>() {213 public Object call() throws Exception {214 assumeTrue(false);215 return null;216 }217 });218 }219 }220 public static class CheckCallableThatDoesNotThrowAnException {221 @Rule222 public ErrorCollector collector = new ErrorCollector();223 @Test224 public void example() {225 Object result = collector.checkSucceeds(new Callable<Object>() {226 public Object call() throws Exception {227 return 3;228 }229 });230 assertEquals(3, result);231 }232 }233 public static class CheckRunnableThatThrowsExpectedTypeOfException {234 @Rule235 public ErrorCollector collector = new ErrorCollector();236 @Test237 public void example() {238 collector.checkThrows(IllegalArgumentException.class, new ThrowingRunnable() {239 public void run() throws Throwable {...
Source: VerifierRuleTest.java
...64 @Rule65 public ErrorCollector collector = new ErrorCollector();66 @Test67 public void example() {68 collector.checkSucceeds(new Callable<Object>() {69 public Object call() throws Exception {70 throw new RuntimeException("first!");71 }72 });73 collector.checkSucceeds(new Callable<Integer>() {74 public Integer call() throws Exception {75 throw new RuntimeException("second!");76 }77 });78 Integer result = collector.checkSucceeds(new Callable<Integer>() {79 public Integer call() throws Exception {80 return 1;81 }82 });83 assertEquals(Integer.valueOf(1), result);84 }85 }86 @Test87 public void usedErrorCollectorCheckSucceedsShouldFail() {88 PrintableResult testResult = testResult(UsesErrorCollectorCheckSucceeds.class);89 assertThat(testResult, hasFailureContaining("first!"));90 assertThat(testResult, hasFailureContaining("second!"));91 }92 public static class UsesErrorCollectorCheckSucceedsPasses {93 @Rule94 public ErrorCollector collector = new ErrorCollector();95 @Test96 public void example() {97 assertEquals(3, collector.checkSucceeds(new Callable<Object>() {98 public Object call() throws Exception {99 return 3;100 }101 }));102 }103 }104 @Test105 public void usedErrorCollectorCheckSucceedsShouldPass() {106 PrintableResult testResult = testResult(UsesErrorCollectorCheckSucceedsPasses.class);107 assertThat(testResult, isSuccessful());108 }109 private static String sequence;110 public static class UsesVerifier {111 @Rule...
Source: ErrorCollector.java
...15 {16 this.errors.add(paramThrowable);17 }18 19 public <T> T checkSucceeds(Callable<T> paramCallable)20 {21 try22 {23 paramCallable = paramCallable.call();24 return paramCallable;25 }26 catch (Throwable paramCallable)27 {28 addError(paramCallable);29 }30 return null;31 }32 33 public <T> void checkThat(T paramT, Matcher<T> paramMatcher)34 {35 checkThat("", paramT, paramMatcher);36 }37 38 public <T> void checkThat(String paramString, T paramT, Matcher<T> paramMatcher)39 {40 checkSucceeds(new ErrorCollector.1(this, paramString, paramT, paramMatcher));41 }42 43 protected void verify()44 throws Throwable45 {46 MultipleFailureException.assertEmpty(this.errors);47 }48}4950
51/* Location: L:\local\mybackup\temp\qq_apk\com.tencent.tim\classes14.jar
52 * Qualified Name: org.junit.rules.ErrorCollector
53 * JD-Core Version: 0.7.0.1
54 */
checkSucceeds
Using AI Code Generation
1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ErrorCollector;4import java.util.Arrays;5import java.util.List;6public class ErrorCollectorTest {7 public ErrorCollector collector = new ErrorCollector();8 public void testErrorCollector() {9 List<Integer> actual = Arrays.asList(1, 2, 3);10 List<Integer> expected = Arrays.asList(1, 2, 3);11 collector.checkThat(actual, is(expected));12 collector.checkThat("Hello", is("Hello"));13 collector.checkThat("Hello", is(not("World")));14 }15}
checkSucceeds
Using AI Code Generation
1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ErrorCollector;4public class ErrorCollectorTest {5 public ErrorCollector collector = new ErrorCollector();6 public void testErrorCollector() {7 collector.addError(new Throwable("Error 1"));8 collector.addError(new Throwable("Error 2"));9 collector.addError(new Throwable("Error 3"));10 System.out.println("testErrorCollector");11 }12}13 at ErrorCollectorTest.testErrorCollector(ErrorCollectorTest.java:12)14 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)15 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)16 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)17 at java.lang.reflect.Method.invoke(Method.java:498)18 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)19 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)20 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)21 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)22 at org.junit.rules.RunRules.evaluate(RunRules.java:20)23 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)24 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)25 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)26 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)27 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)28 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)29 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)30 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)31 at org.junit.runners.ParentRunner.run(ParentRunner.java:363)32 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)33 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)34 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(R
checkSucceeds
Using AI Code Generation
1public ErrorCollector collector = new ErrorCollector();2public void test() {3 collector.checkSucceeds(new Runnable() {4 public void run() {5 assertEquals(1, 1);6 }7 });8}9 at org.junit.Assert.assertEquals(Assert.java:115)10 at org.junit.Assert.assertEquals(Assert.java:144)11 at com.test.junit.ErrorCollectorTest$1.run(ErrorCollectorTest.java:14)12 at org.junit.rules.ErrorCollector$1.evaluate(ErrorCollector.java:68)13 at org.junit.rules.RunRules.evaluate(RunRules.java:20)14 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)15 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)16 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)17 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)18 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)19 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)20 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)21 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)22 at org.junit.runners.ParentRunner.run(ParentRunner.java:363)23 at org.junit.runner.JUnitCore.run(JUnitCore.java:137)24 at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)25 at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)26 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)27 at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
checkSucceeds
Using AI Code Generation
1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ErrorCollector;4public class ErrorCollectorTest {5 public ErrorCollector collector = new ErrorCollector();6 public void test() {7 });8 });9 });10 }11}12import org.junit.Rule;13import org.junit.Test;14import org.junit.rules.ErrorCollector;15public class ErrorCollectorTest {16 public ErrorCollector collector = new ErrorCollector();17 public void test() {18 });19 throw new IllegalArgumentException("input is null");20 });21 });22 }23}24import org.junit.Rule;25import org.junit.Test;
checkSucceeds
Using AI Code Generation
1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ErrorCollector;4public class ErrorCollectorExample {5 public ErrorCollector collector = new ErrorCollector();6 public void example() {7 collector.addError(new Throwable("first thing went wrong"));8 collector.addError(new Throwable("second thing went wrong"));9 collector.checkSucceeds(() -> {10 });11 }12}13 at java.base/java.lang.Object.wait(Native Method)14 at java.base/java.lang.Object.wait(Object.java:328)15 at java.base/java.lang.Thread.join(Thread.java:1050)16 at java.base/java.lang.Thread.join(Thread.java:1110)17 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)18 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)19 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)20 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)21 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)22 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)23 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)24 at org.junit.runners.ParentRunner.run(ParentRunner.java:309)25 at org.junit.runner.JUnitCore.run(JUnitCore.java:160)26 at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)27 at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)28 at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)29 at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:53)30 at java.base/java.lang.Object.wait(Native Method)
checkSucceeds
Using AI Code Generation
1import org.junit.Rule;2import org.junit.Test;3import org.junit.rules.ErrorCollector;4public class ErrorCollectorExample {5 public ErrorCollector errorCollector = new ErrorCollector();6 public void test1() {7 errorCollector.checkSucceeds(() -> {8 if (1 == 2) {9 throw new RuntimeException("1 is not equal to 2");10 }11 });12 errorCollector.checkSucceeds(() -> {13 if (1 == 3) {14 throw new RuntimeException("1 is not equal to 3");15 }16 });17 errorCollector.checkSucceeds(() -> {18 if (1 == 4) {19 throw new RuntimeException("1 is not equal to 4");20 }21 });22 }23}
checkSucceeds
Using AI Code Generation
1 at org.junit.Assert.assertEquals(Assert.java:115)2 at org.junit.Assert.assertEquals(Assert.java:144)3 at org.junit.rules.ErrorCollectorTest.testCheckSucceeds(ErrorCollectorTest.java:24)4 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)5 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)6 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)7 at java.lang.reflect.Method.invoke(Method.java:606)8 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)9 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)10 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)11 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)12 at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)13 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)14 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)15 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)16 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)17 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)18 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)19 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)20 at org.junit.runners.ParentRunner.run(ParentRunner.java:292)
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Your kind of situation is awkward, as it feels bad to keep duplicating work in order to isolate the tests (see below) - but note that most of the duplication can be pulled out into setUp
and tearDown
(@Before
, @After
) methods, so you don't need much extra code. Provided that the tests are not running so slowly that you stop running them often, it's better to waste a bit of CPU in the name of clean testing.
public void testAdd() throws Exception {
// wipe database
// add something
// assert that it was added
}
public void testUpdate() throws Exception {
// wipe database
// add something
// update it
// assert that it was updated
}
public void testDelete() throws Exception {
// wipe database
// add something
// delete it
// assert that it was deleted
}
The alternative is to stick everything into one test with multiple asserts, but this is harder to understand and maintain, and gives a bit less information when a test fails:
public void testCRUD() throws Exception {
// wipe database
// add something
// assert that it was added
// update it
// assert that it was updated
// delete it
// assert that it was deleted
}
Testing with databases or collections or storage of any kind is tricky because one test can always affect other tests by leaving junk behind in the database/collection. Even if your tests don't explicitly rely on one another, they may still interfere with one another, especially if one of them fails.
Where possible, use a fresh instance for each test, or wipe the data, ideally in as simple a way as possible - e.g. for a database, wiping an entire table is more likely to succeed than a very specific deletion that you might accidentally get wrong.
Update: It's usually better to wipe data at the start of the test, so one failed test run doesn't affect the next run.
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