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

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

Source:ForwardCompatibilityPrintingTest.java

...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}
...

Source:TestRunner.java

...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}...

Source:TextRunnerSingleMethodTest.java

...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}...

setPrinter

Using AI Code Generation

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}

setPrinter

Using AI Code Generation

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)

setPrinter

Using AI Code Generation

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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Here are the detailed JUnit testing chapters to help you get started:

Importance of Unit testing - Learn why Unit testing is essential during the development phase to identify bugs and errors.
Top Java Unit testing frameworks - Here are the upcoming JUnit automation testing frameworks that you can use in 2023 to boost your unit testing.
What is the JUnit framework
Why is JUnit testing important - Learn the importance and numerous benefits of using the JUnit testing framework.
Features of JUnit - Learn about the numerous features of JUnit and why developers prefer it.
JUnit 5 vs. JUnit 4: Differences - Here is a complete comparison between JUnit 5 and JUnit 4 testing frameworks.
Setting up the JUnit environment - Learn how to set up your JUnit testing environment.
Getting started with JUnit testing - After successfully setting up your JUnit environment, this chapter will help you get started with JUnit testing in no time.
Parallel testing with JUnit - Parallel Testing can be used to reduce test execution time and improve test efficiency. Learn how to perform parallel testing with JUnit.
Annotations in JUnit - When writing automation scripts with JUnit, we can use JUnit annotations to specify the type of methods in our test code. This helps us identify those methods when we run JUnit tests using Selenium WebDriver. Learn in detail what annotations are in JUnit.
Assertions in JUnit - Assertions are used to validate or test that the result of an action/functionality is the same as expected. Learn in detail what assertions are and how to use them while performing JUnit testing.
Parameterization in JUnit - Parameterized Test enables you to run the same automated test scripts with different variables. By collecting data on each method's test parameters, you can minimize time spent on writing tests. Learn how to use parameterization in JUnit.
Nested Tests In JUnit 5 - A nested class is a non-static class contained within another class in a hierarchical structure. It can share the state and setup of the outer class. Learn about nested annotations in JUnit 5 with examples.
Best practices for JUnit testing - Learn about the best practices, such as always testing key methods and classes, integrating JUnit tests with your build, and more to get the best possible results.
Advanced Use Cases for JUnit testing - Take a deep dive into the advanced use cases, such as how to run JUnit tests in Jupiter, how to use JUnit 5 Mockito for Unit testing, and more for JUnit testing.