Add a few assertions.

Author: Gary Gregory

src/test/java/org/apache/commons/io/FileUtilsTest.java

@@ -1623,6 +1623,7 @@ public void testIsDirectory() throws IOException {
 
         final Path tempDir = Files.createTempDirectory(getClass().getCanonicalName());
         final File tempDirAsFile = tempDir.toFile();
+        assertTrue(FileUtils.isDirectory(tempDirAsFile));
         Files.delete(tempDir);
         assertFalse(FileUtils.isDirectory(tempDirAsFile));
     }

src/test/java/org/apache/commons/io/file/PathUtilsTest.java

@@ -229,6 +229,7 @@ public void testIsDirectory() throws IOException {
         assertFalse(PathUtils.isDirectory(testFile1));
 
         final Path tempDir = Files.createTempDirectory(getClass().getCanonicalName());
+        assertTrue(PathUtils.isDirectory(tempDir));
         Files.delete(tempDir);
         assertFalse(PathUtils.isDirectory(tempDir));
     }