Add and enforce spring checkstyle configurations

src/test/java/org/springframework/guice/BindingDeduplicationTests.java

@@ -1,17 +1,31 @@
+/*
+ * Copyright 2018-2022 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
+ *
+ *      https://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.guice;
 
 import com.google.inject.AbstractModule;
 import com.google.inject.CreationException;
 import com.google.inject.Module;
-
 import com.google.inject.multibindings.OptionalBinder;
 import org.junit.AfterClass;
 import org.junit.Test;
+
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.guice.BindingDeduplicationTests.SomeDependency;
-import org.springframework.guice.BindingDeduplicationTests.SomeOptionalDependency;
 import org.springframework.guice.annotation.EnableGuiceModules;
 
 import static org.junit.Assert.assertNotNull;
@@ -51,32 +65,32 @@ public class BindingDeduplicationTests {
 
 	}
 
+	@EnableGuiceModules
+	@Configuration
+	static class BindingDeduplicationTestsConfig {
+
+		@Bean
+		SomeDependency someBean() {
+			return new SomeDependency();
+		}
+
+		@Bean
+		SomeOptionalDependency someOptionalBean() {
+			return new SomeOptionalDependency();
+		}
+
+		@Bean
+		Module module() {
+			return new AbstractModule() {
+				@Override
+				protected void configure() {
+					bind(SomeDependency.class).asEagerSingleton();
+					OptionalBinder.newOptionalBinder(binder(), SomeOptionalDependency.class).setDefault()
+							.to(SomeOptionalDependency.class);
+				}
+			};
+		}
+
+	}
+
 }
-
-@EnableGuiceModules
-@Configuration
-class BindingDeduplicationTestsConfig {
-
-	@Bean
-	public SomeDependency someBean() {
-		return new SomeDependency();
-	}
-
-	@Bean
-	public SomeOptionalDependency someOptionalBean() {
-		return new SomeOptionalDependency();
-	}
-
-	@Bean
-	public Module module() {
-		return new AbstractModule() {
-			@Override
-			protected void configure() {
-				bind(SomeDependency.class).asEagerSingleton();
-				OptionalBinder.newOptionalBinder(binder(), SomeOptionalDependency.class).setDefault()
-						.to(SomeOptionalDependency.class);
-			}
-		};
-	}
-
-}