Consider resource loader path when checking Groovy template availability

Closes gh-8304

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/groovy/template/GroovyTemplateAvailabilityProvider.java

 /*
- * Copyright 2012-2015 the original author or authors.
+ * Copyright 2012-2017 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.
@@ -38,11 +38,14 @@ public class GroovyTemplateAvailabilityProvider implements TemplateAvailabilityP
 		if (ClassUtils.isPresent("groovy.text.TemplateEngine", classLoader)) {
 			PropertyResolver resolver = new RelaxedPropertyResolver(environment,
 					"spring.groovy.template.");
+			String loaderPath = resolver.getProperty("resource-loader-path",
+					GroovyTemplateProperties.DEFAULT_RESOURCE_LOADER_PATH);
 			String prefix = resolver.getProperty("prefix",
 					GroovyTemplateProperties.DEFAULT_PREFIX);
 			String suffix = resolver.getProperty("suffix",
 					GroovyTemplateProperties.DEFAULT_SUFFIX);
-			return resourceLoader.getResource(prefix + view + suffix).exists();
+			return resourceLoader.getResource(loaderPath + prefix + view + suffix)
+					.exists();
 		}
 		return false;
 	}

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/groovy/template/GroovyTemplateAvailabilityProviderTests.java

+/*
+ * Copyright 2012-2017 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.autoconfigure.groovy.template;
+
+import org.junit.Test;
+
+import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider;
+import org.springframework.core.io.DefaultResourceLoader;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.mock.env.MockEnvironment;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link GroovyTemplateAvailabilityProvider}.
+ *
+ * @author Andy Wilkinson
+ */
+public class GroovyTemplateAvailabilityProviderTests {
+
+	private final TemplateAvailabilityProvider provider = new GroovyTemplateAvailabilityProvider();
+
+	private final ResourceLoader resourceLoader = new DefaultResourceLoader();
+
+	private final MockEnvironment environment = new MockEnvironment();
+
+	@Test
+	public void availabilityOfTemplateInDefaultLocation() {
+		assertThat(this.provider.isTemplateAvailable("home", this.environment,
+				getClass().getClassLoader(), this.resourceLoader)).isTrue();
+	}
+
+	@Test
+	public void availabilityOfTemplateThatDoesNotExist() {
+		assertThat(this.provider.isTemplateAvailable("whatever", this.environment,
+				getClass().getClassLoader(), this.resourceLoader)).isFalse();
+	}
+
+	@Test
+	public void availabilityOfTemplateWithCustomLoaderPath() {
+		this.environment.setProperty("spring.groovy.template.resource-loader-path",
+				"classpath:/custom-templates/");
+		assertThat(this.provider.isTemplateAvailable("custom", this.environment,
+				getClass().getClassLoader(), this.resourceLoader)).isTrue();
+	}
+
+	@Test
+	public void availabilityOfTemplateWithCustomPrefix() {
+		this.environment.setProperty("spring.groovy.template.prefix", "prefix/");
+		assertThat(this.provider.isTemplateAvailable("prefixed", this.environment,
+				getClass().getClassLoader(), this.resourceLoader)).isTrue();
+	}
+
+	@Test
+	public void availabilityOfTemplateWithCustomSuffix() {
+		this.environment.setProperty("spring.groovy.template.suffix", ".groovytemplate");
+		assertThat(this.provider.isTemplateAvailable("suffixed", this.environment,
+				getClass().getClassLoader(), this.resourceLoader)).isTrue();
+	}
+
+}