Fix inconsistency with imports in Locker tests

https://build.spring.io/browse/INT-SI51X-93/

Author: artembilan

spring-integration-file/src/test/java/org/springframework/integration/file/locking/FileChannelCacheTests.java

@@ -27,6 +27,8 @@
 
 /**
  * @author Emmanuel Roux
+ * @author Artem Bilan
+ *
  * @since 4.3.22
  */
 public class FileChannelCacheTests {
@@ -35,7 +37,7 @@ public class FileChannelCacheTests {
 	public TemporaryFolder temp = new TemporaryFolder();
 
 	@Test
-	public void throwsExceptionWhenFileNotExists() throws IOException {
+	public void noLockWhenFileNotExists() throws IOException {
 		File testFile = new File(temp.getRoot(), "test0");
 		assertThat(testFile.exists()).isFalse();
 		assertThat(FileChannelCache.tryLockFor(testFile)).isNull();
@@ -45,7 +47,6 @@ public void throwsExceptionWhenFileNotExists() throws IOException {
 	@Test
 	public void fileLocked() throws IOException {
 		File testFile = temp.newFile("test1");
-		testFile.createNewFile();
 		assertThat(testFile.exists()).isTrue();
 		assertThat(FileChannelCache.tryLockFor(testFile)).isNotNull();
 		FileChannelCache.closeChannelFor(testFile);

spring-integration-file/src/test/java/org/springframework/integration/file/locking/NioFileLockerTests.java

@@ -17,6 +17,7 @@
 package org.springframework.integration.file.locking;
 
 import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 
@@ -37,6 +38,7 @@
  * @author Iwein Fuld
  * @author Gary Russell
  * @author Emmanuel Roux
+ * @author Artem Bilan
  */
 public class NioFileLockerTests {
 
@@ -84,16 +86,16 @@ public void fileLockedWhenNotAlreadyLockedAndExists() throws IOException {
 		NioFileLocker locker = new NioFileLocker();
 		File testFile = new File(workdir, "test2");
 		testFile.createNewFile();
-		assertThat(locker.lock(testFile)).isTrue();
+		assertTrue(locker.lock(testFile));
 		locker.unlock(testFile);
 	}
 
 	@Test
-	public void fileNotLockedWhenNotExists() throws IOException {
+	public void fileNotLockedWhenNotExists() {
 		NioFileLocker locker = new NioFileLocker();
 		File testFile = new File(workdir, "test3");
-		assertThat(locker.lock(testFile)).isFalse();
-		assertThat(testFile.exists()).isFalse();
+		assertFalse(locker.lock(testFile));
+		assertFalse(testFile.exists());
 	}
 
 }