Allow devtools properties in user.home

Support loading a `.spring-boot-devtools.properties` file from the
users home folder. The property file can be used to customize settings
that make sense on a per-user basis, but might not want to be checked
into the project.

Fixes gh-3151

spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/DevToolHomePropertiesPostProcessorTests.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2012-2015 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.devtools.autoconfigure;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Properties;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.core.env.Environment;
+import org.springframework.mock.env.MockEnvironment;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.nullValue;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link DevToolHomePropertiesPostProcessor}.
+ *
+ * @author Phillip Webb
+ */
+public class DevToolHomePropertiesPostProcessorTests {
+
+	@Rule
+	public TemporaryFolder temp = new TemporaryFolder();
+
+	private File home;
+
+	@Before
+	public void setup() throws IOException {
+		this.home = this.temp.newFolder();
+	}
+
+	@Test
+	public void loadsHomeProperties() throws Exception {
+		Properties properties = new Properties();
+		properties.put("abc", "def");
+		OutputStream out = new FileOutputStream(new File(this.home,
+				".spring-boot-devtools.properties"));
+		properties.store(out, null);
+		out.close();
+		Environment environment = new MockEnvironment();
+		MockDevToolHomePropertiesPostProcessor postProcessor = new MockDevToolHomePropertiesPostProcessor();
+		postProcessor.setEnvironment(environment);
+		postProcessor.postProcessBeanFactory(mock(ConfigurableListableBeanFactory.class));
+		assertThat(environment.getProperty("abc"), equalTo("def"));
+	}
+
+	@Test
+	public void ignoresMissingHomeProperties() throws Exception {
+		Environment environment = new MockEnvironment();
+		MockDevToolHomePropertiesPostProcessor postProcessor = new MockDevToolHomePropertiesPostProcessor();
+		postProcessor.setEnvironment(environment);
+		postProcessor.postProcessBeanFactory(mock(ConfigurableListableBeanFactory.class));
+		assertThat(environment.getProperty("abc"), nullValue());
+	}
+
+	private class MockDevToolHomePropertiesPostProcessor extends
+			DevToolHomePropertiesPostProcessor {
+
+		@Override
+		protected File getHomeFolder() {
+			return DevToolHomePropertiesPostProcessorTests.this.home;
+		}
+	}
+
+}