Test unresolved dependency analysis in the Gradle plugin

See gh-12784

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/plugin/SpringBootPluginIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * 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.
@@ -16,6 +16,9 @@
 
 package org.springframework.boot.gradle.plugin;
 
+import java.io.File;
+import java.io.IOException;
+
 import org.gradle.testkit.runner.BuildResult;
 import org.junit.Rule;
 import org.junit.Test;
@@ -51,4 +54,22 @@ public class SpringBootPluginIntegrationTests {
 		this.gradleBuild.gradleVersion("4.0").build();
 	}
 
+	@Test
+	public void unresolvedDependenciesAreAnalyzedWhenDependencyResolutionFails()
+			throws IOException {
+		createMinimalMainSource();
+		BuildResult result = this.gradleBuild.buildAndFail("compileJava");
+		assertThat(result.getOutput()).contains(
+				"During the build, one or more dependencies that were declared without a"
+						+ " version failed to resolve:")
+				.contains("    org.springframework.boot:spring-boot-starter:");
+	}
+
+	private void createMinimalMainSource() throws IOException {
+		File examplePackage = new File(this.gradleBuild.getProjectDir(),
+				"src/main/java/com/example");
+		examplePackage.mkdirs();
+		new File(examplePackage, "Application.java").createNewFile();
+	}
+
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/plugin/SpringBootPluginIntegrationTests-unresolvedDependenciesAreAnalyzedWhenDependencyResolutionFails.gradle

@@ -0,0 +1,16 @@
+buildscript {
+	dependencies {
+		classpath files(pluginClasspath.split(','))
+	}
+}
+
+apply plugin: 'org.springframework.boot'
+apply plugin: 'java'
+
+repositories {
+	flatDir { dirs 'libs' }
+}
+
+dependencies {
+	compile 'org.springframework.boot:spring-boot-starter'
+}