mernst commented on a change in pull request #117:
URL: https://github.com/apache/commons-io/pull/117#discussion_r432871156



##########
File path: 
src/test/java/org/apache/commons/io/input/ReversedLinesFileReaderTestSimple.java
##########
@@ -66,6 +67,10 @@ public void testUnsupportedEncodingBig5() throws 
URISyntaxException {
                 () -> new ReversedLinesFileReader(testFileEncodingBig5, 
IOUtils.DEFAULT_BUFFER_SIZE, "Big5").close());
     }
 
-
+    @Test
+    public void testNullEncoding() throws IOException, URISyntaxException {
+        new ReversedLinesFileReader(new 
File(this.getClass().getResource("/test-file-empty.bin").toURI()),
+                                    (Charset) null);
+    }

Review comment:
       @garydgregory I agree that would be a useful test, even though it is not 
directly related to this bug fix.
   
   I've made my best guess at how to test for the default Charset in a 
system-independent way.
   
   I'm not sure whether this is what you had in mind.  If not, could point me 
at documentation about how Commons IO prefers to test that the default Charset 
is being used?
   
   Thanks.




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