Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use Annotation Type Parameterized.AfterParam class of org.junit.runners package

Best junit code snippet using org.junit.runners.Annotation Type Parameterized.AfterParam

Source:BlockJUnit4ClassRunnerWithParameters.java

1package org.junit.runners.parameterized;2import java.lang.annotation.Annotation;3import java.lang.reflect.Field;4import java.util.List;5import org.junit.internal.runners.statements.RunAfters;6import org.junit.internal.runners.statements.RunBefores;7import org.junit.runner.RunWith;8import org.junit.runner.notification.RunNotifier;9import org.junit.runners.BlockJUnit4ClassRunner;10import org.junit.runners.Parameterized;11import org.junit.runners.Parameterized.Parameter;12import org.junit.runners.model.FrameworkField;13import org.junit.runners.model.FrameworkMethod;14import org.junit.runners.model.InitializationError;15import org.junit.runners.model.Statement;16/**17 * A {@link BlockJUnit4ClassRunner} with parameters support. Parameters can be18 * injected via constructor or into annotated fields.19 */20public class BlockJUnit4ClassRunnerWithParameters extends21        BlockJUnit4ClassRunner {22    private enum InjectionType {23        CONSTRUCTOR, FIELD24    }25    private final Object[] parameters;26    private final String name;27    public BlockJUnit4ClassRunnerWithParameters(TestWithParameters test)28            throws InitializationError {29        super(test.getTestClass());30        parameters = test.getParameters().toArray(31                new Object[test.getParameters().size()]);32        name = test.getName();33    }34    @Override35    public Object createTest() throws Exception {36        InjectionType injectionType = getInjectionType();37        switch (injectionType) {38            case CONSTRUCTOR:39                return createTestUsingConstructorInjection();40            case FIELD:41                return createTestUsingFieldInjection();42            default:43                throw new IllegalStateException("The injection type "44                        + injectionType + " is not supported.");45        }46    }47    private Object createTestUsingConstructorInjection() throws Exception {48        return getTestClass().getOnlyConstructor().newInstance(parameters);49    }50    private Object createTestUsingFieldInjection() throws Exception {51        List<FrameworkField> annotatedFieldsByParameter = getAnnotatedFieldsByParameter();52        if (annotatedFieldsByParameter.size() != parameters.length) {53            throw new Exception(54                    "Wrong number of parameters and @Parameter fields."55                            + " @Parameter fields counted: "56                            + annotatedFieldsByParameter.size()57                            + ", available parameters: " + parameters.length58                            + ".");59        }60        Object testClassInstance = getTestClass().getJavaClass().newInstance();61        for (FrameworkField each : annotatedFieldsByParameter) {62            Field field = each.getField();63            Parameter annotation = field.getAnnotation(Parameter.class);64            int index = annotation.value();65            try {66                field.set(testClassInstance, parameters[index]);67            } catch (IllegalAccessException e) {68                IllegalAccessException wrappedException = new IllegalAccessException(69                        "Cannot set parameter '" + field.getName()70                                + "'. Ensure that the field '" + field.getName()71                                + "' is public.");72                wrappedException.initCause(e);73                throw wrappedException;74            } catch (IllegalArgumentException iare) {75                throw new Exception(getTestClass().getName()76                        + ": Trying to set " + field.getName()77                        + " with the value " + parameters[index]78                        + " that is not the right type ("79                        + parameters[index].getClass().getSimpleName()80                        + " instead of " + field.getType().getSimpleName()81                        + ").", iare);82            }83        }84        return testClassInstance;85    }86    @Override87    protected String getName() {88        return name;89    }90    @Override91    protected String testName(FrameworkMethod method) {92        return method.getName() + getName();93    }94    @Override95    protected void validateConstructor(List<Throwable> errors) {96        validateOnlyOneConstructor(errors);97        if (getInjectionType() != InjectionType.CONSTRUCTOR) {98            validateZeroArgConstructor(errors);99        }100    }101    @Override102    protected void validateFields(List<Throwable> errors) {103        super.validateFields(errors);104        if (getInjectionType() == InjectionType.FIELD) {105            List<FrameworkField> annotatedFieldsByParameter = getAnnotatedFieldsByParameter();106            int[] usedIndices = new int[annotatedFieldsByParameter.size()];107            for (FrameworkField each : annotatedFieldsByParameter) {108                int index = each.getField().getAnnotation(Parameter.class)109                        .value();110                if (index < 0 || index > annotatedFieldsByParameter.size() - 1) {111                    errors.add(new Exception("Invalid @Parameter value: "112                            + index + ". @Parameter fields counted: "113                            + annotatedFieldsByParameter.size()114                            + ". Please use an index between 0 and "115                            + (annotatedFieldsByParameter.size() - 1) + "."));116                } else {117                    usedIndices[index]++;118                }119            }120            for (int index = 0; index < usedIndices.length; index++) {121                int numberOfUse = usedIndices[index];122                if (numberOfUse == 0) {123                    errors.add(new Exception("@Parameter(" + index124                            + ") is never used."));125                } else if (numberOfUse > 1) {126                    errors.add(new Exception("@Parameter(" + index127                            + ") is used more than once (" + numberOfUse + ")."));128                }129            }130        }131    }132    @Override133    protected Statement classBlock(RunNotifier notifier) {134        Statement statement = childrenInvoker(notifier);135        statement = withBeforeParams(statement);136        statement = withAfterParams(statement);137        return statement;138    }139    private Statement withBeforeParams(Statement statement) {140        List<FrameworkMethod> befores = getTestClass()141                .getAnnotatedMethods(Parameterized.BeforeParam.class);142        return befores.isEmpty() ? statement : new RunBeforeParams(statement, befores);143    }144    private class RunBeforeParams extends RunBefores {145        RunBeforeParams(Statement next, List<FrameworkMethod> befores) {146            super(next, befores, null);147        }148        @Override149        protected void invokeMethod(FrameworkMethod method) throws Throwable {150            int paramCount = method.getMethod().getParameterTypes().length;151            method.invokeExplosively(null, paramCount == 0 ? (Object[]) null : parameters);152        }153    }154    private Statement withAfterParams(Statement statement) {155        List<FrameworkMethod> afters = getTestClass()156                .getAnnotatedMethods(Parameterized.AfterParam.class);157        return afters.isEmpty() ? statement : new RunAfterParams(statement, afters);158    }159    private class RunAfterParams extends RunAfters {160        RunAfterParams(Statement next, List<FrameworkMethod> afters) {161            super(next, afters, null);162        }163        @Override164        protected void invokeMethod(FrameworkMethod method) throws Throwable {165            int paramCount = method.getMethod().getParameterTypes().length;166            method.invokeExplosively(null, paramCount == 0 ? (Object[]) null : parameters);167        }168    }169    @Override170    protected Annotation[] getRunnerAnnotations() {171        Annotation[] allAnnotations = super.getRunnerAnnotations();172        Annotation[] annotationsWithoutRunWith = new Annotation[allAnnotations.length - 1];173        int i = 0;174        for (Annotation annotation: allAnnotations) {175            if (!annotation.annotationType().equals(RunWith.class)) {176                annotationsWithoutRunWith[i] = annotation;177                ++i;178            }179        }180        return annotationsWithoutRunWith;181    }182    private List<FrameworkField> getAnnotatedFieldsByParameter() {183        return getTestClass().getAnnotatedFields(Parameter.class);184    }185    private InjectionType getInjectionType() {186        if (fieldsAreAnnotated()) {187            return InjectionType.FIELD;188        } else {189            return InjectionType.CONSTRUCTOR;190        }191    }192    private boolean fieldsAreAnnotated() {193        return !getAnnotatedFieldsByParameter().isEmpty();194    }195}...

Annotation Type Parameterized.AfterParam

Using AI Code Generation

1import org.junit.runners.Parameterized;2import org.junit.runners.Parameterized.Parameters;3import org.junit.runners.Parameterized.Parameter;4import org.junit.runner.RunWith;5import org.junit.Test;6import static org.junit.Assert.assertEquals;7@RunWith(Parameterized.class)8public class AfterParamTest {9    private int input;10    private int expected;11    @Parameter(value = 0)12    public void setInput(int input) {13        this.input = input;14    }15    @Parameter(value = 1)16    public void setExpected(int expected) {17        this.expected = expected;18    }19    public static Object[][] data() {20        return new Object[][] {21            {1, 1},22            {2, 2},23            {3, 3},24            {4, 4},25            {5, 5}26        };27    }28    public void test() {29        assertEquals(expected, input);30    }31}32OK (1 test)

Annotation Type Parameterized.AfterParam

Using AI Code Generation

1import org.junit.runners.Parameterized;2public class ParameterizedExample {3    public static Iterable<Object[]> data1() {4        return Arrays.asList(new Object[][] { { 1, 1 }, { 2, 2 }, { 8, 8 }, { 4, 4 } });5    }6    @Parameterized.Parameter(0)7    public int fInput;8    @Parameterized.Parameter(1)9    public int fExpected;10    public void test() {11        assertEquals(fExpected, fInput);12    }13}14import org.junit.runners.Parameterized;15public class ParameterizedExample {16    public static Iterable<Object[]> data1() {17        return Arrays.asList(new Object[][] { { 1, 1 }, { 2, 2 }, { 8, 8 }, { 4, 4 } });18    }19    @Parameterized.Parameter(0)20    public int fInput;21    @Parameterized.Parameter(1)22    public int fExpected;23    public void test() {24        assertEquals(fExpected, fInput);25    }26}27import org.junit.runners.Parameterized;28public class ParameterizedExample {29    public static Iterable<Object[]> data1() {30        return Arrays.asList(new Object[][] { { 1, 1 }, { 2, 2 }, { 8, 8 }, { 4, 4 } });31    }32    @Parameterized.Parameter(0)33    public int fInput;34    @Parameterized.Parameter(1)35    public int fExpected;36    public void test() {37        assertEquals(fExpected, fInput);38    }39}40import org.junit.runners.Parameterized;41public class ParameterizedExample {42    public static Iterable<Object[]> data1() {43        return Arrays.asList(new Object[][] { { 1, 1 }, { 2, 2 }, { 8, 8 }, { 4, 4 } });44    }45    @Parameterized.Parameter(0)46    public int fInput;47    @Parameterized.Parameter(1)

Annotation Type Parameterized.AfterParam

Using AI Code Generation

1import org.junit.runners.Parameterized;2import org.junit.runners.Parameterized.AfterParam;3public class ParameterizedTest {4	public static void afterParam(Object param) {5		System.out.println("After Parameterized Test: " + param);6	}7}8import org.junit.runners.Parameterized;9import org.junit.runners.Parameterized.BeforeParam;10public class ParameterizedTest {11	public static void beforeParam(Object param) {12		System.out.println("Before Parameterized Test: " + param);13	}14}15import org.junit.runners.Parameterized;16import org.junit.runners.Parameterized.Parameters;17public class ParameterizedTest {18	public static Collection<Object[]> data() {19		return Arrays.asList(new Object[][] { { 0, false }, { 5, false }, { 6, true }, { 10, true }, { 11, false }, });20	}21	private int fInput;22	private boolean fExpected;23	public ParameterizedTest(int input, boolean expected) {24		fInput = input;25		fExpected = expected;26	}27	public void test() {28		assertEquals(fExpected, fInput % 2 == 0);29	}30}31import org.junit.runners.Parameterized;32import org.junit.runners.Parameterized.UseParametersRunnerFactory;33public class ParameterizedTest {34	@UseParametersRunnerFactory(CustomRunnerFactory.class)35	public static class CustomRunnerFactory implements ParametersRunnerFactory {36		public Runner createRunnerForTestWithParameters(TestWithParameters test) throws InitializationError {37			return new BlockJUnit4ClassRunnerWithParameters(test);38		}39	}40}41import org.junit.runners.Parameterized;42import org.junit.runners.Parameterized.UseParametersRunnerFactory;43public class ParameterizedTest {44	@UseParametersRunnerFactory(CustomRunnerFactory.class)45	public static class CustomRunnerFactory implements ParametersRunnerFactory {46		public Runner createRunnerForTestWithParameters(TestWithParameters test) throws InitializationError {47			return new BlockJUnit4ClassRunnerWithParameters(test);48		}49	}50}

Annotation Type Parameterized.AfterParam

Using AI Code Generation

1@RunWith(Parameterized.class)2public class TestRunner {3    private String name;4    private int age;5    private String address;6    public TestRunner(String name, int age, String address) {7        this.name = name;8        this.age = age;9        this.address = address;10    }11    public static Collection<Object[]> data() {12        Object[][] data = new Object[][] { { "John", 20, "USA" }, { "Peter", 25, "UK" }, { "Mark", 30, "China" } };13        return Arrays.asList(data);14    }15    public void test() {16        System.out.println("Name: " + name + ", Age: " + age + ", Address: " + address);17    }18}

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.