Test that auto configurations can be added by init scripts

When an init command is run, it may add entries to the classpath. This
commit adds a test that verifies that, if an entry that is added to
the classpath contains a CompilerAutoConfiguration file in
META-INF/services, then the CompilerAutoConfigurations declared in it
are found by subsequent ServiceLoader.load calls.

spring-boot-cli/src/test/java/cli/command/CustomCompilerAutoConfiguration.java

+/*
+ * Copyright 2012-2013 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 cli.command;
+
+import groovy.lang.GroovyClassLoader;
+
+import org.codehaus.groovy.ast.ClassNode;
+import org.codehaus.groovy.classgen.GeneratorContext;
+import org.codehaus.groovy.control.CompilationFailedException;
+import org.codehaus.groovy.control.SourceUnit;
+import org.springframework.boot.cli.compiler.CompilerAutoConfiguration;
+import org.springframework.boot.cli.compiler.GroovyCompilerConfiguration;
+
+/**
+ * @author Andy Wilkinson
+ */
+public class CustomCompilerAutoConfiguration extends CompilerAutoConfiguration {
+
+	@Override
+	public void apply(GroovyClassLoader loader,
+			GroovyCompilerConfiguration configuration, GeneratorContext generatorContext,
+			SourceUnit source, ClassNode classNode) throws CompilationFailedException {
+		System.out.println("Customising compiler configuration");
+	}
+
+}

spring-boot-cli/src/test/java/org/springframework/boot/cli/command/InitCommandTests.java

@@ -18,6 +18,8 @@ package org.springframework.boot.cli.command;
 
 import groovy.lang.GroovyClassLoader;
 
+import java.util.ServiceLoader;
+
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
@@ -25,6 +27,9 @@ import org.junit.Test;
 import org.springframework.boot.OutputCapture;
 import org.springframework.boot.cli.Command;
 import org.springframework.boot.cli.SpringCli;
+import org.springframework.boot.cli.compiler.CompilerAutoConfiguration;
+
+import cli.command.CustomCompilerAutoConfiguration;
 
 import static org.junit.Assert.assertTrue;
 import static org.mockito.Matchers.any;
@@ -67,6 +72,22 @@ public class InitCommandTests {
 		this.command.run("src/test/resources/grab.groovy");
 		verify(this.cli, times(this.defaultCount + 1)).register(any(Command.class));
 		assertTrue(this.output.toString().contains("Hello Grab"));
+
+		Iterable<CompilerAutoConfiguration> autoConfigurations = ServiceLoader.load(
+				CompilerAutoConfiguration.class, Thread.currentThread()
+						.getContextClassLoader());
+
+		boolean foundCustomConfiguration = false;
+
+		for (CompilerAutoConfiguration autoConfiguration : autoConfigurations) {
+			if (CustomCompilerAutoConfiguration.class.getName().equals(
+					autoConfiguration.getClass().getName())) {
+				foundCustomConfiguration = true;
+				break;
+			}
+		}
+
+		assertTrue(foundCustomConfiguration);
 	}
 
 	@Test

spring-boot-cli/src/test/plugins/custom/META-INF/services/org.springframework.boot.cli.compiler.CompilerAutoConfiguration

+cli.command.CustomCompilerAutoConfiguration
\ No newline at end of file