Support @TestConstructor config via JUnit Platform config param

This commit introduces support for setting the
spring.test.constructor.autowire.mode property via a JUnit Platform
configuration parameter -- for example, via the
junit-platform.properties file.

Closes gh-24285

spring-test/src/test/java/org/springframework/test/context/junit/jupiter/TestConstructorIntegrationTests.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright 2002-2020 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.test.context.junit.jupiter;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ParameterResolutionException;
+import org.junit.platform.testkit.engine.EngineTestKit;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.SpringProperties;
+import org.springframework.test.context.TestConstructor;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.platform.engine.discovery.DiscoverySelectors.selectClass;
+import static org.junit.platform.testkit.engine.EventConditions.event;
+import static org.junit.platform.testkit.engine.EventConditions.finishedWithFailure;
+import static org.junit.platform.testkit.engine.EventConditions.test;
+import static org.junit.platform.testkit.engine.TestExecutionResultConditions.instanceOf;
+import static org.junit.platform.testkit.engine.TestExecutionResultConditions.message;
+import static org.springframework.test.context.TestConstructor.TEST_CONSTRUCTOR_AUTOWIRE_MODE_PROPERTY_NAME;
+
+/**
+ * Integration tests for {@link TestConstructor @TestConstructor} support.
+ *
+ * @author Sam Brannen
+ * @since 5.3
+ */
+class TestConstructorIntegrationTests {
+
+	@BeforeEach
+	@AfterEach
+	void clearSpringProperty() {
+		setSpringProperty(null);
+	}
+
+	@Test
+	void autowireModeNotSetToAll() {
+		EngineTestKit.engine("junit-jupiter")
+			.selectors(selectClass(AutomaticallyAutowiredTestCase.class))
+			.execute()
+			.testEvents()
+			.assertStatistics(stats -> stats.started(1).succeeded(0).failed(1))
+			.assertThatEvents().haveExactly(1, event(test("test"),
+				finishedWithFailure(
+					instanceOf(ParameterResolutionException.class),
+					message(msg -> msg.matches(".+for parameter \\[java\\.lang\\.String .+\\] in constructor.+")))));
+	}
+
+	@Test
+	void autowireModeSetToAllViaSpringProperties() {
+		setSpringProperty("all");
+
+		EngineTestKit.engine("junit-jupiter")
+			.selectors(selectClass(AutomaticallyAutowiredTestCase.class))
+			.execute()
+			.testEvents()
+			.assertStatistics(stats -> stats.started(1).succeeded(1).failed(0));
+	}
+
+	@Test
+	void autowireModeSetToAllViaJUnitPlatformConfigurationParameter() {
+		EngineTestKit.engine("junit-jupiter")
+			.selectors(selectClass(AutomaticallyAutowiredTestCase.class))
+			.configurationParameter(TEST_CONSTRUCTOR_AUTOWIRE_MODE_PROPERTY_NAME, "all")
+			.execute()
+			.testEvents()
+			.assertStatistics(stats -> stats.started(1).succeeded(1).failed(0));
+	}
+
+
+	private void setSpringProperty(String flag) {
+		SpringProperties.setProperty(TEST_CONSTRUCTOR_AUTOWIRE_MODE_PROPERTY_NAME, flag);
+	}
+
+
+	@SpringJUnitConfig
+	@FailingTestCase
+	static class AutomaticallyAutowiredTestCase {
+
+		private final String foo;
+
+
+		AutomaticallyAutowiredTestCase(String foo) {
+			this.foo = foo;
+		}
+
+		@Test
+		void test() {
+			assertThat(foo).isEqualTo("bar");
+		}
+
+
+		@Configuration
+		static class Config {
+
+			@Bean
+			String foo() {
+				return "bar";
+			}
+		}
+	}
+
+}