removing !TESTING

Author: iSapozhnik

Sources/TextDiff/DiffSegmentIndexer.swift

@@ -32,7 +32,6 @@ enum DiffSegmentIndexer {
                 updatedRange = NSRange(location: updatedCursor, length: textLength)
                 let originalMatches = textMatches(segment.text, source: originalNSString, at: originalCursor)
                 let updatedMatches = textMatches(segment.text, source: updatedNSString, at: updatedCursor)
-                #if !TESTING
                 assert(
                     originalMatches,
                     "Equal segment text mismatch in original at \(originalCursor) for segment \(index): \(segment.text)"
@@ -41,7 +40,6 @@ enum DiffSegmentIndexer {
                     updatedMatches,
                     "Equal segment text mismatch in updated at \(updatedCursor) for segment \(index): \(segment.text)"
                 )
-                #endif
                 originalCursor += textLength
                 updatedCursor += textLength
             case .delete: