Remove ambiguous test

src/applications/differential/parser/DifferentialChangesetParser.php

@@ -157,7 +157,8 @@ final class DifferentialChangesetParser {
     $offsets_old = $this->originalLeft->computeOffsets();
     $offsets_new = $this->originalRight->computeOffsets();
 
-    // Highlight lines that were add on each side or removed on the other side.
+    // Highlight lines that were added on each side or removed on the other
+    // side.
     $highlight_old = array();
     $highlight_new = array();
     $last = max(last_key($olds), last_key($news));

src/applications/differential/parser/__tests__/DifferentialChangesetParserTestCase.php

@@ -31,7 +31,6 @@ final class DifferentialChangesetParserTestCase extends ArcanistPhutilTestCase {
       "+a\n x\n-c" => array(array(), array()),
       "+aa\n b\n-c" => array(array(1), array(11)),
       " b\n-c" => array(array(1), array()),
-      " x\n-c" => array(array(1), array()),
       "+a\n b\n c" => array(array(), array(13)),
       "+a\n x\n c" => array(array(), array(13)),
     );