Added checkstyle for tests

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/FunctionRegistrationTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.function.context;
 
 import java.util.function.Function;

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/FunctionTypeTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.function.context;
 
 import java.lang.reflect.Type;

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/catalog/InMemoryFunctionCatalogTests.java

@@ -24,10 +24,7 @@ import org.springframework.cloud.function.context.FunctionRegistration;
 import org.springframework.cloud.function.context.FunctionType;
 import org.springframework.cloud.function.core.FluxFunction;
 
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.junit.Assert.assertTrue;
+import static org.assertj.core.api.Assertions.assertThat;
 
 /**
  * @author Oleg Zhurakousky
@@ -43,7 +40,7 @@ public class InMemoryFunctionCatalogTests {
 		InMemoryFunctionCatalog catalog = new InMemoryFunctionCatalog();
 		catalog.register(registration);
 		FunctionRegistration<?> registration2 = catalog.getRegistration(function);
-		assertSame(registration, registration2);
+		assertThat(registration2).isSameAs(registration);
 	}
 
 	@Test
@@ -55,11 +52,11 @@ public class InMemoryFunctionCatalogTests {
 		catalog.register(registration);
 
 		Object lookedUpFunction = catalog.lookup("hello");
-		assertNull(lookedUpFunction);
+		assertThat(lookedUpFunction).isNull();
 
 		lookedUpFunction = catalog.lookup("foo");
-		assertNotNull(lookedUpFunction);
-		assertTrue(lookedUpFunction instanceof FluxFunction);
+		assertThat(lookedUpFunction).isNotNull();
+		assertThat(lookedUpFunction instanceof FluxFunction).isTrue();
 	}
 
 	private static class TestFunction implements Function<Integer, String> {

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/config/ContextFunctionCatalogAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019-2018 the original author or authors.
+ * Copyright 2012-2019 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.

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/config/ContextFunctionCatalogInitializerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019-2018 the original author or authors.
+ * Copyright 2012-2019 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.

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/config/ContextFunctionPostProcessorTests.java

@@ -40,7 +40,6 @@ import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.util.ClassUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.Assert.assertNull;
 
 /**
  * @author Dave Syer
@@ -132,7 +131,7 @@ public class ContextFunctionPostProcessorTests {
 				System.out::println, "consumer"));
 		Supplier<Mono<Void>> supplier = (Supplier<Mono<Void>>) this.processor
 				.lookupSupplier("supplier|consumer");
-		assertNull(supplier.get().block());
+		assertThat(supplier.get().block()).isNull();
 	}
 
 	@Test

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/context/string/FunctionalStringSourceTests.java

@@ -36,7 +36,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  */
 @RunWith(SpringRunner.class)
+// @checkstyle:off
 @FunctionalSpringBootTest(classes = Object.class, properties = "spring.main.sources=org.springframework.cloud.function.context.string.FunctionalStringSourceTests.TestConfiguration")
+// @checkstyle:on
 public class FunctionalStringSourceTests {
 
 	@Autowired

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/inject/FooConfiguration.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.function.inject;
 
 import java.util.function.Function;

spring-cloud-function-context/src/test/java/org/springframework/cloud/function/util/JsonMapperTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.cloud.function.util;
 
 import java.util.Arrays;