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Module "junit-jupiter-params" of JUnit 5.
There is a newer version: 5.5.0-M1
/*
 * Copyright 2015-2025 the original author or authors.
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v2.0 which
 * accompanies this distribution and is available at
 *
 * https://www.eclipse.org/legal/epl-v20.html
 */

package org.junit.jupiter.params;

import static org.junit.platform.commons.support.AnnotationSupport.findAnnotation;
import static org.junit.platform.commons.support.AnnotationSupport.findRepeatableAnnotations;

import java.lang.reflect.Method;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.Stream;

import org.junit.jupiter.api.extension.ExtensionContext;
import org.junit.jupiter.api.extension.ExtensionContext.Namespace;
import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.ArgumentsProvider;
import org.junit.jupiter.params.provider.ArgumentsSource;
import org.junit.jupiter.params.support.AnnotationConsumerInitializer;
import org.junit.platform.commons.util.ExceptionUtils;
import org.junit.platform.commons.util.Preconditions;

/**
 * @since 5.0
 */
class ParameterizedTestExtension implements TestTemplateInvocationContextProvider {

	static final String METHOD_CONTEXT_KEY = "context";
	static final String ARGUMENT_MAX_LENGTH_KEY = "junit.jupiter.params.displayname.argument.maxlength";
	static final String DEFAULT_DISPLAY_NAME = "{default_display_name}";
	static final String DISPLAY_NAME_PATTERN_KEY = "junit.jupiter.params.displayname.default";

	@Override
	public boolean supportsTestTemplate(ExtensionContext context) {
		if (!context.getTestMethod().isPresent()) {
			return false;
		}

		Method templateMethod = context.getTestMethod().get();
		Optional annotation = findAnnotation(templateMethod, ParameterizedTest.class);
		if (!annotation.isPresent()) {
			return false;
		}

		ParameterizedTestMethodContext methodContext = new ParameterizedTestMethodContext(templateMethod,
			annotation.get());

		Preconditions.condition(methodContext.hasPotentiallyValidSignature(),
			() -> String.format(
				"@ParameterizedTest method [%s] declares formal parameters in an invalid order: "
						+ "argument aggregators must be declared after any indexed arguments "
						+ "and before any arguments resolved by another ParameterResolver.",
				templateMethod.toGenericString()));

		getStore(context).put(METHOD_CONTEXT_KEY, methodContext);

		return true;
	}

	@Override
	public Stream provideTestTemplateInvocationContexts(
			ExtensionContext extensionContext) {

		ParameterizedTestMethodContext methodContext = getMethodContext(extensionContext);
		ParameterizedTestNameFormatter formatter = createNameFormatter(extensionContext, methodContext);
		AtomicLong invocationCount = new AtomicLong(0);

		List argumentsSources = findRepeatableAnnotations(methodContext.method, ArgumentsSource.class);

		Preconditions.notEmpty(argumentsSources,
			"Configuration error: You must configure at least one arguments source for this @ParameterizedTest");

		// @formatter:off
		return argumentsSources
				.stream()
				.map(ArgumentsSource::value)
				.map(clazz -> ParameterizedTestSpiInstantiator.instantiate(ArgumentsProvider.class, clazz, extensionContext))
				.map(provider -> AnnotationConsumerInitializer.initialize(methodContext.method, provider))
				.flatMap(provider -> arguments(provider, extensionContext))
				.map(arguments -> {
					invocationCount.incrementAndGet();
					return createInvocationContext(formatter, methodContext, arguments, invocationCount.intValue());
				})
				.onClose(() ->
						Preconditions.condition(invocationCount.get() > 0 || methodContext.annotation.allowZeroInvocations(),
								"Configuration error: You must configure at least one set of arguments for this @ParameterizedTest"));
		// @formatter:on
	}

	@Override
	public boolean mayReturnZeroTestTemplateInvocationContexts(ExtensionContext extensionContext) {
		ParameterizedTestMethodContext methodContext = getMethodContext(extensionContext);
		return methodContext.annotation.allowZeroInvocations();
	}

	private ParameterizedTestMethodContext getMethodContext(ExtensionContext extensionContext) {
		return getStore(extensionContext)//
				.get(METHOD_CONTEXT_KEY, ParameterizedTestMethodContext.class);
	}

	private ExtensionContext.Store getStore(ExtensionContext context) {
		return context.getStore(Namespace.create(ParameterizedTestExtension.class, context.getRequiredTestMethod()));
	}

	private TestTemplateInvocationContext createInvocationContext(ParameterizedTestNameFormatter formatter,
			ParameterizedTestMethodContext methodContext, Arguments arguments, int invocationIndex) {

		return new ParameterizedTestInvocationContext(formatter, methodContext, arguments, invocationIndex);
	}

	private ParameterizedTestNameFormatter createNameFormatter(ExtensionContext extensionContext,
			ParameterizedTestMethodContext methodContext) {

		String name = methodContext.annotation.name();
		String pattern = name.equals(DEFAULT_DISPLAY_NAME)
				? extensionContext.getConfigurationParameter(DISPLAY_NAME_PATTERN_KEY) //
						.orElse(ParameterizedTest.DEFAULT_DISPLAY_NAME)
				: name;
		pattern = Preconditions.notBlank(pattern.trim(),
			() -> String.format(
				"Configuration error: @ParameterizedTest on method [%s] must be declared with a non-empty name.",
				methodContext.method));

		int argumentMaxLength = extensionContext.getConfigurationParameter(ARGUMENT_MAX_LENGTH_KEY, Integer::parseInt) //
				.orElse(512);

		return new ParameterizedTestNameFormatter(pattern, extensionContext.getDisplayName(), methodContext,
			argumentMaxLength);
	}

	protected static Stream arguments(ArgumentsProvider provider, ExtensionContext context) {
		try {
			return provider.provideArguments(context);
		}
		catch (Exception e) {
			throw ExceptionUtils.throwAsUncheckedException(e);
		}
	}

}