Use better testcase

tests/by-util/test_expand.rs

@@ -396,13 +396,16 @@ fn test_comma_with_plus_4() {
 #[test]
 fn test_args_override() {
     new_ucmd!()
-        .args(&["-i", "-i", "alice_in_wonderland.txt"])
+        .args(&["-i", "-i", "with-trailing-tab.txt"])
         .run()
         .stdout_is(
-            "Alice was beginning to get very tired of sitting by\n\
-        her sister on the bank, and of having nothing to do: once or twice\n\
-        she had peeped into the book her sister was reading, but it had no\n\
-        pictures or conversations in it, \"and what is the use of a book,\"\n\
-        thought Alice \"without pictures or conversation?\"\n",
+            "// !note: file contains significant whitespace
+// * indentation uses <TAB> characters
+int main() {
+        // * next line has both a leading & trailing tab
+        // with tabs=>	
+        return 0;
+}
+",
         );
 }

tests/fixtures/expand/alice_in_wonderland.txt

@@ -1,5 +0,0 @@
-Alice was beginning to get very tired of sitting by
-her sister on the bank, and of having nothing to do: once or twice
-she had peeped into the book her sister was reading, but it had no
-pictures or conversations in it, "and what is the use of a book,"
-thought Alice "without pictures or conversation?"