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How to use TestCase class of junit.framework package

Best junit code snippet using junit.framework.TestCase

Source:StackFilterTest.java

23import java.io.PrintWriter;4import java.io.StringWriter;56import junit.framework.TestCase;7import junit.runner.BaseTestRunner;89public class StackFilterTest extends TestCase {10	String fFiltered;11	String fUnfiltered;12	13	@Override14	protected void setUp() {15		StringWriter swin= new StringWriter();16		PrintWriter pwin= new PrintWriter(swin);17		pwin.println("junit.framework.AssertionFailedError");18		pwin.println("	at junit.framework.Assert.fail(Assert.java:144)");19		pwin.println("	at junit.framework.Assert.assert(Assert.java:19)");20		pwin.println("	at junit.framework.Assert.assert(Assert.java:26)");21		pwin.println("	at MyTest.f(MyTest.java:13)");22		pwin.println("	at MyTest.testStackTrace(MyTest.java:8)");23		pwin.println("	at java.lang.reflect.Method.invoke(Native Method)");24		pwin.println("	at junit.framework.TestCase.runTest(TestCase.java:156)");25		pwin.println("	at junit.framework.TestCase.runBare(TestCase.java:130)");26		pwin.println("	at junit.framework.TestResult$1.protect(TestResult.java:100)");27		pwin.println("	at junit.framework.TestResult.runProtected(TestResult.java:118)");28		pwin.println("	at junit.framework.TestResult.run(TestResult.java:103)");29		pwin.println("	at junit.framework.TestCase.run(TestCase.java:121)");30		pwin.println("	at junit.framework.TestSuite.runTest(TestSuite.java:157)");31		pwin.println("	at junit.framework.TestSuite.run(TestSuite.java, Compiled Code)");32		pwin.println("	at junit.swingui.TestRunner$17.run(TestRunner.java:669)");33		fUnfiltered= swin.toString();3435		StringWriter swout= new StringWriter();36		PrintWriter pwout= new PrintWriter(swout);37		pwout.println("junit.framework.AssertionFailedError");38		pwout.println("	at MyTest.f(MyTest.java:13)");39		pwout.println("	at MyTest.testStackTrace(MyTest.java:8)");40		fFiltered= swout.toString();41	}42		43	public void testFilter() {
...

Source:TestImplementorTest.java

1package junit.tests.framework;23import junit.framework.Protectable;4import junit.framework.Test;5import junit.framework.TestCase;6import junit.framework.TestResult;78/**9 * Test an implementor of junit.framework.Test other than TestCase or TestSuite10 */11public class TestImplementorTest extends TestCase {12	public static class DoubleTestCase implements Test {13		private TestCase fTestCase;14		15		public DoubleTestCase(TestCase testCase) {16			fTestCase= testCase;17		}18		19		public int countTestCases() {20			return 2;21		}22		23		public void run(TestResult result) {24			result.startTest(this);25			Protectable p= new Protectable() {26				public void protect() throws Throwable {27					fTestCase.runBare();28					fTestCase.runBare();29				}30			};31			result.runProtected(this, p);32			result.endTest(this);33		}34	}35	36	private DoubleTestCase fTest;37	38	public TestImplementorTest() {39		TestCase testCase= new TestCase() {40			@Override41			public void runTest() {42			}43		};44		fTest= new DoubleTestCase(testCase);45	}46	47	public void testSuccessfulRun() {48		TestResult result= new TestResult();49		fTest.run(result);50		assertEquals(fTest.countTestCases(), result.runCount());51		assertEquals(0, result.errorCount());52		assertEquals(0, result.failureCount());53	}54}
...

TestCase

Using AI Code Generation

1import junit.framework.TestCase;2public class TestJunit extends TestCase {3   protected int value1, value2;4   protected void setUp(){5      value1 = 3;6      value2 = 3;7   }8   public void testAdd(){9      double result = value1 + value2;10      assertTrue(result == 6);11   }12}13OK (4 tests)14@Test(timeout=1000)15@Test(expected=ArithmeticException.class)16@Test(timeout=1000, expected=ArithmeticException.class)17@RunWith(Parameterized.class)

TestCase

Using AI Code Generation

1import junit.framework.TestCase;2public class Test extends TestCase {3   protected int value1, value2;4   protected void setUp(){5      value1 = 3;6      value2 = 3;7   }8   public void testAdd(){9      double result = value1 + value2;10      assertTrue(result == 6);11   }12}13The Test class extends TestCase class, which provides the functionality of the test case to the subclass. The test case class contains three important methods:14OK (1 test)

TestCase

Using AI Code Generation

1import junit.framework.TestCase;2public class Test extends TestCase {3   protected int value1, value2;4   protected void setUp(){5      value1 = 3;6      value2 = 3;7   }8   public void testAdd(){9      double result = value1 + value2;10      assertTrue(result == 6);11   }12}13C:\Users\USER\Documents\Java>javac -cp .;junit-4.12.jar Test.java14C:\Users\USER\Documents\Java>java -cp .;junit-4.12.jar;junit-4.12-sources.jar;junit-4.12-javadoc.jar;hamcrest-core-1.3.jar org.junit.runner.JUnitCore Test15OK (1 test)

TestCase

Using AI Code Generation

1package com.javatpoint;2import junit.framework.TestCase;3public class TestJunit1 extends TestCase {4   protected int value1, value2;5   protected void setUp(){6      value1 = 3;7      value2 = 3;8   }9   public void testAdd(){10      double result = value1 + value2;11      assertTrue(result == 6);12   }13}14C:\Users\shiva sai\Desktop>javac -cp .;junit-4.13.jar;hamcrest-core-1.3.jar TestJunit1.java15C:\Users\shiva sai\Desktop>java -cp .;junit-4.13.jar;hamcrest-core-1.3.jar org.junit.runner.JUnitCore TestJunit116OK (1 test)

TestCase

Using AI Code Generation

1import junit.framework.TestCase;2public class MyTest extends TestCase {3   public void testAdd() {4      int num = 5;5      String temp = null;6      String str = "Junit is working fine";7      assertEquals("Junit is working fine", str);8      assertFalse(num > 6);9      assertNotNull(str);10   }11}

TestCase

Using AI Code Generation

1import org.junit.Test;2import org.junit.Before;3import org.junit.After;4import static org.junit.Assert.assertEquals;5import static org.junit.Assert.assertNotNull;6import static org.junit.Assert.assertTrue;7public class TestJunit1 {8   protected int value1, value2;9   public void setUp() {10      value1 = 3;11      value2 = 3;12   }13   public void testAdd() {14      double result = value1 + value2;15      assertTrue(result == 6);16   }17   public void testSubtract() {18      double result = value1 - value2;19      assertTrue(result == 0);20   }21   public void testMultiply() {22      double result = value1 * value2;23      assertTrue(result == 9);24   }25   public void testDivide() {26      double result = value1 / value2;27      assertTrue(result == 1);28   }29}

TestCase

Using AI Code Generation

1import junit.framework.TestCase;2import static junit.framework.TestCase.assertEquals;3import org.junit.Test;4import org.junit.Before;5import org.junit.After;6public class TestJunit extends TestCase {7   protected double fValue1;8   protected double fValue2;9   public void setUp() {10      fValue1 = 2.0;11      fValue2 = 3.0;12   }13   public void testAdd() {14      System.out.println("No of Test Case = "+ this.countTestCases());15      String name = this.getName();16      System.out.println("Test Case Name = "+ name);17      this.setName("testNewAdd");18      String newName = this.getName();19      System.out.println("Updated Test Case Name = "+ newName);20   }21   public void tearDown(  ) {22   }23}

TestCase

Using AI Code Generation

1import junit.framework.TestCase;2import java.util.ArrayList;3public class TestArrayList extends TestCase {4    public void testArrayList() {5        ArrayList<String> list = new ArrayList<String>();6        list.add("abc");7        list.add("def");8        list.add("ghi");9        assertEquals(3, list.size());10        assertEquals("abc", list.get(0));11        assertEquals("def", list.get(1));12        assertEquals("ghi", list.get(2));13    }14}15import org.junit.Test;16import java.util.ArrayList;17import static org.junit.Assert.assertEquals;18public class TestArrayList {19    public void testArrayList() {20        ArrayList<String> list = new ArrayList<String>();21        list.add("abc");22        list.add("def");23        list.add("ghi");24        assertEquals(3, list.size());25        assertEquals("abc", list.get(0));26        assertEquals("def", list.get(1));27        assertEquals("ghi", list.get(2));28    }29}

TestCase

Using AI Code Generation

1import org.junit.Test;2import org.junit.Assert;3import org.junit.Before;4public class JUnit4Test {5  private Calculator calculator;6  public void setUp() {7    calculator = new Calculator();8  }9  public void testAdd() {10    int result = calculator.add(3, 4);11    Assert.assertEquals(7, result);12  }13  public void testSubtract() {14    int result = calculator.subtract(3, 4);15    Assert.assertEquals(-1, result);16  }17}

Source: Maven does not find JUnit tests to run

1public String randomString(int length, String characterSet) {2    return IntStream.range(0, length).map(i -> new SecureRandom().nextInt(characterSet.length())).mapToObj(randomInt -> characterSet.substring(randomInt, randomInt + 1)).collect(Collectors.joining());3}45@Test6public void buildFiveRandomStrings() {7    for (int q = 0; q < 5; q++) {8        System.out.println(randomString(10, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")); // The character set can basically be anything9    }10}11

Source:Maven does not find JUnit tests to run

public String randomString(int length, String characterSet) {
    return IntStream.range(0, length).map(i -> new SecureRandom().nextInt(characterSet.length())).mapToObj(randomInt -> characterSet.substring(randomInt, randomInt + 1)).collect(Collectors.joining());
}

@Test
public void buildFiveRandomStrings() {
    for (int q = 0; q < 5; q++) {
        System.out.println(randomString(10, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")); // The character set can basically be anything
    }
}

Source: How do I convert CamelCase into human-readable names in Java?

1import org.apache.commons.lang3.RandomStringUtils;23String keyLength = 20;4RandomStringUtils.randomAlphanumeric(keylength);5

JUnit Tutorial:

LambdaTest also has a detailed JUnit tutorial explaining its features, importance, advanced use cases, best practices, and more to help you get started with running your automation testing scripts.

JUnit Tutorial Chapters:

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.