Add Java InfoContributor

See gh-28136

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/info/java/JavaInfoContributorTests.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2021-2021 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.actuate.info.java;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.actuate.info.Info;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link JavaInfoContributor}
+ *
+ * @author Jonatan Ivanov
+ */
+class JavaInfoContributorTests {
+
+	@Test
+	void javaInfoShouldBeAdded() {
+		JavaInfoContributor javaInfoContributor = new JavaInfoContributor();
+		Info.Builder builder = new Info.Builder();
+		javaInfoContributor.contribute(builder);
+
+		assertThat(builder.build().getDetails().get("java")).isInstanceOf(JavaInfo.class);
+		JavaInfo javaInfo = (JavaInfo) builder.build().getDetails().get("java");
+
+		assertThat(javaInfo.getVendor()).isEqualTo(System.getProperty("java.vendor"));
+		assertThat(javaInfo.getVersion()).isEqualTo(System.getProperty("java.version"));
+		assertThat(javaInfo.getRuntime().getName()).isEqualTo(System.getProperty("java.runtime.name"));
+		assertThat(javaInfo.getRuntime().getVersion()).isEqualTo(System.getProperty("java.runtime.version"));
+		assertThat(javaInfo.getVm().getName()).isEqualTo(System.getProperty("java.vm.name"));
+		assertThat(javaInfo.getVm().getVendor()).isEqualTo(System.getProperty("java.vm.vendor"));
+		assertThat(javaInfo.getVm().getVersion()).isEqualTo(System.getProperty("java.vm.version"));
+	}
+
+}