How to use setPrinter method of junit.textui.TestRunner class

Best junit code snippet using junit.textui.TestRunner.setPrinter

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...41 public void printErrors(TestResult result) {42 getWriter().println("Errors here");43 }44 };45 runner.setPrinter(printer);46 TestSuite suite= new TestSuite();47 suite.addTest(new TestCase() {48 @Override49 public void runTest() throws Exception {50 throw new Exception();51 }52 });53 runner.doRun(suite);54 assertEquals(expected, output.toString());55 }5657 public static class ATest {58 @Test public void error() {59 Assert.fail();60 }61 }62 63 public void testErrorAdapted() {64 ByteArrayOutputStream output= new ByteArrayOutputStream();65 TestRunner runner= new TestRunner(new TestResultPrinter(66 new PrintStream(output)));6768 String expected= expected(new String[] { ".E", "Time: 0",69 "Errors here", "", "FAILURES!!!",70 "Tests run: 1, Failures: 0, Errors: 1", "" });71 ResultPrinter printer= new TestResultPrinter(new PrintStream(output)) {72 @Override73 public void printErrors(TestResult result) {74 getWriter().println("Errors here");75 }76 };77 runner.setPrinter(printer);78 runner.doRun(new JUnit4TestAdapter(ATest.class));79 assertEquals(expected, output.toString());80 }8182 private String expected(String[] lines) {83 OutputStream expected= new ByteArrayOutputStream();84 PrintStream expectedWriter= new PrintStream(expected);85 for (int i= 0; i < lines.length; i++)86 expectedWriter.println(lines[i]);87 return expected.toString();88 }89} ...

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...18 public static void main(java.lang.String[]);19 public junit.framework.TestResult start(java.lang.String[]) throws java.lang.Exception;20 protected junit.framework.TestResult runSingleMethod(java.lang.String, java.lang.String, boolean) throws java.lang.Exception;21 protected void runFailed(java.lang.String);22 public void setPrinter(junit.textui.ResultPrinter);23}...

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...18 }19 }20 public void testSingle() throws Exception {21 TestRunner t = new TestRunner();22 t.setPrinter(new ResultPrinter(new PrintStream(new ByteArrayOutputStream())));23 String[] args = {24 "-m", "junit.tests.runner.TextRunnerSingleMethodTest$InvocationTest.testWasInvoked"25 };26 fgWasInvoked = false;27 t.start(args);28 assertTrue(fgWasInvoked);29 }30}...

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1package com.javatpoint;2import org.junit.runner.JUnitCore;3import org.junit.runner.Result;4import org.junit.runner.notification.Failure;5import org.junit.runner.notification.RunListener;6public class TestRunner extends RunListener {7 public static void main(String[] args) {8 JUnitCore core = new JUnitCore();9 core.addListener(new TestRunner());10 Result result = core.run(TestJunit.class);11 for (Failure failure : result.getFailures()) {12 System.out.println(failure.toString());13 }14 System.out.println(result.wasSuccessful());15 }16 public void testRunStarted(org.junit.runner.Description description)17 throws Exception {18 System.out.println("Number of test cases to execute: "19 + description.testCount());20 }21 public void testRunFinished(Result result) throws Exception {22 System.out.println("Number of test cases executed: "23 + result.getRunCount());24 }25 public void testStarted(org.junit.runner.Description description)26 throws Exception {27 System.out.println("Started executing test case: "28 + description.getMethodName());29 }30 public void testFinished(org.junit.runner.Description description)31 throws Exception {32 System.out.println("Finished executing test case: "33 + description.getMethodName());34 }35}

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1import junit.textui.TestRunner;2import junit.framework.Test;3import junit.framework.TestCase;4import junit.framework.TestSuite;5public class TestRunnerTest extends TestCase {6 public TestRunnerTest(String name) {7 super(name);8 }9 public static void main(String args[]) {10 TestRunner.run(suite());11 }12 public static Test suite() {13 return new TestSuite(TestRunnerTest.class);14 }15 public void testAdd() {16 int result = 2 + 3;17 assertTrue(result == 5);18 }19 public void testSubtract() {20 int result = 5 - 3;21 assertTrue(result == 2);22 }23}24OK (1 test)25OK (2 tests)26 at junit.framework.Assert.fail(Assert.java:47)27 at junit.framework.Assert.assertTrue(Assert.java:20)28 at TestRunnerTest.testAdd(TestRunnerTest.java:19)29 at java.lang.reflect.Method.invoke(Native Method)30 at junit.framework.TestCase.runTest(TestCase.java:176)31 at junit.framework.TestCase.runBare(TestCase.java:141)32 at junit.framework.TestResult$1.protect(TestResult.java:122)33 at junit.framework.TestResult.runProtected(TestResult.java:142)34 at junit.framework.TestResult.run(TestResult.java:125)35 at junit.framework.TestCase.run(TestCase.java:129)36 at junit.framework.TestSuite.runTest(TestSuite.java:252)37 at junit.framework.TestSuite.run(TestSuite.java:247)38 at junit.textui.TestRunner.doRun(TestRunner.java:92)39 at junit.textui.TestRunner.run(TestRunner.java:70)40 at junit.textui.TestRunner.run(TestRunner.java:78)41 at TestRunnerTest.main(TestRunnerTest.java:9)

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1package com.test;2import junit.framework.Test;3import junit.framework.TestSuite;4import junit.textui.TestRunner;5public class TestRunnerClass {6 public static void main(String[] args) {7 TestRunner runner = new TestRunner();8 runner.setPrinter(new MyPrinter());9 TestSuite suite = new TestSuite();10 suite.addTestSuite(TestClass.class);11 runner.doRun(suite);12 }13}14package com.test;15import java.io.PrintStream;16import junit.textui.ResultPrinter;17public class MyPrinter extends ResultPrinter {18 public MyPrinter(PrintStream writer) {19 super(writer);20 }21 protected void printHeader(long runTime) {22 getWriter().print("Custom Header");23 super.printHeader(runTime);24 }25 protected void printErrors(TestResult result) {26 getWriter().print("Custom Error");27 super.printErrors(result);28 }29 protected void printFailures(TestResult result) {30 getWriter().print("Custom Failure");31 super.printFailures(result);32 }33 protected void printFooter(TestResult result) {34 getWriter().print("Custom Footer");35 super.printFooter(result);36 }37}38package com.test;39import junit.framework.TestCase;40public class TestClass extends TestCase {41 public void test() {42 assertTrue(true);43 }44}45OK (1 test)

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Had the same message. I had to remove the Run/Debug configuration.

In my case, I ran the unit test as a local test before. After that I moved my test to the androidTest package and tried to run it again. Android Studio remembered the last run configuration so it tried to run it again as a local unit test which produced the same error.

After removing the config and running the test again it generated a new configuration and worked.

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https://stackoverflow.com/questions/39282282/class-not-found-empty-test-suite-in-intellij

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