GH-190 - Introduce @EnableScenarios.

The dedicated annotation allows using Scenario as test parameter in @SpringBootTest-based integration tests, too.

ScenarioParameterResolver now throws a better error message if a TransactionTemplate bean is missing from the ApplicationContext.

spring-modulith-test/src/test/java/org/springframework/modulith/test/EnableScenarioIntegrationTests.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.modulith.test;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import example.TestConfiguration;
+
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.modulith.test.EnableScenarioIntegrationTests.TransactionTemplateTestConfiguration;
+import org.springframework.transaction.PlatformTransactionManager;
+import org.springframework.transaction.support.TransactionTemplate;
+
+/**
+ * Integration tests for the usage of {@link EnableScenarios}.
+ *
+ * @author Oliver Drotbohm
+ */
+@Nested
+@EnableScenarios
+@SpringBootTest(classes = { TestConfiguration.class, TransactionTemplateTestConfiguration.class })
+class EnableScenarioIntegrationTests {
+
+	@Configuration
+	static class TransactionTemplateTestConfiguration {
+
+		@Bean
+		TransactionTemplate transactionTemplate() {
+			return new TransactionTemplate(mock(PlatformTransactionManager.class));
+		}
+	}
+
+	@Test // GH-190
+	void injectsScenario(Scenario scenario) {
+		assertThat(scenario).isNotNull();
+	}
+}