Document support for java.util.Duration

Closes gh-12244

spring-boot-project/spring-boot-docs/src/test/java/org/springframework/boot/docs/context/properties/bind/AppSystemPropertiesTests.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2012-2018 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
+ *
+ *      http://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.docs.context.properties.bind;
+
+import java.time.Duration;
+import java.util.function.Consumer;
+
+import org.junit.Test;
+
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.test.context.runner.ContextConsumer;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link AppSystemProperties}.
+ *
+ * @author Stephane Nicoll
+ */
+public class AppSystemPropertiesTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withUserConfiguration(Config.class);
+
+	@Test
+	public void bindWithDefaultUnit() {
+		this.contextRunner.withPropertyValues("app.system.session-timeout=40",
+				"app.system.read-timeout=5000").run(assertBinding(p -> {
+			assertThat(p.getSessionTimeout()).isEqualTo(Duration.ofSeconds(40));
+			assertThat(p.getReadTimeout()).isEqualTo(Duration.ofMillis(5000));
+		}));
+	}
+
+	@Test
+	public void bindWithExplicitUnit() {
+		this.contextRunner.withPropertyValues("app.system.session-timeout=1h",
+				"app.system.read-timeout=5s").run(assertBinding(p -> {
+			assertThat(p.getSessionTimeout()).isEqualTo(Duration.ofMinutes(60));
+			assertThat(p.getReadTimeout()).isEqualTo(Duration.ofMillis(5000));
+		}));
+	}
+
+	@Test
+	public void bindWithIso8601Format() {
+		this.contextRunner.withPropertyValues("app.system.session-timeout=PT15S",
+				"app.system.read-timeout=PT0.5S").run(assertBinding(p -> {
+			assertThat(p.getSessionTimeout()).isEqualTo(Duration.ofSeconds(15));
+			assertThat(p.getReadTimeout()).isEqualTo(Duration.ofMillis(500));
+		}));
+	}
+
+	private ContextConsumer<AssertableApplicationContext> assertBinding(
+			Consumer<AppSystemProperties> appSystemProperties) {
+		return (context) -> {
+			assertThat(context).hasSingleBean(AppSystemProperties.class);
+			appSystemProperties.accept(context.getBean(AppSystemProperties.class));
+		};
+	}
+
+	@Configuration
+	@EnableConfigurationProperties(AppSystemProperties.class)
+	static class Config {
+
+	}
+
+}