Implement AssertJ assertions for SimpleAsyncTaskExecutor

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/test/java/org/springframework/boot/testsupport/assertj/SimpleAsyncTaskExecutorAssertTests.java

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+/*
+ * Copyright 2012-2023 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.boot.testsupport.assertj;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledForJreRange;
+import org.junit.jupiter.api.condition.JRE;
+
+import org.springframework.core.task.SimpleAsyncTaskExecutor;
+
+/**
+ * Tests for {@link SimpleAsyncTaskExecutorAssert}.
+ *
+ * @author Moritz Halbritter
+ */
+class SimpleAsyncTaskExecutorAssertTests {
+
+	@Test
+	void usesPlatformThreads() {
+		SimpleAsyncTaskExecutor executor = new SimpleAsyncTaskExecutor();
+		executor.setVirtualThreads(false);
+		SimpleAsyncTaskExecutorAssert.assertThat(executor).usesPlatformThreads();
+	}
+
+	@Test
+	@EnabledForJreRange(min = JRE.JAVA_21)
+	void usesVirtualThreads() {
+		SimpleAsyncTaskExecutor executor = new SimpleAsyncTaskExecutor();
+		executor.setVirtualThreads(true);
+		SimpleAsyncTaskExecutorAssert.assertThat(executor).usesVirtualThreads();
+	}
+
+}