Fix unit tests

Author: scootermon

invoke/runners.py

@@ -713,8 +713,10 @@ def read_proc_output(self, reader: Callable) -> Generator[str, None, None]:
                 break
             # The incremental decoder will deal with partial characters.
             yield decoder.decode(data)
-        # Emit the final chunk of data
-        yield decoder.decode(b"", True)
+        pending_buf, _ = decoder.getstate()
+        if pending_buf:
+            # Emit the final chunk of data
+            yield decoder.decode(b"", True)
 
     def write_our_output(self, stream: IO, string: str) -> None:
         """