Implementing null file

rich/_null_file.py

@@ -12,7 +12,7 @@ class NullFile(IO[str]):
 
     @property
     def name(self) -> str:
-        return ""
+        return "NullFile"
 
     def closed(self) -> bool:
         return False
@@ -57,7 +57,7 @@ class NullFile(IO[str]):
         return ""
 
     def __iter__(self) -> Iterator[AnyStr]:
-        pass
+        return iter([""])
 
     def __enter__(self) -> IO[AnyStr]:
         pass

tests/test_null_file.py

@@ -0,0 +1,26 @@
+from rich._null_file import NullFile
+
+
+def test_null_file():
+    file = NullFile()
+    with file:
+        assert file.write("abc") == 0
+        assert file.mode == ""
+        assert file.name == "NullFile"
+        assert not file.closed()
+        assert file.close() is None
+        assert not file.isatty()
+        assert file.read() == ""
+        assert not file.readable()
+        assert file.readline() == ""
+        assert file.readlines() == []
+        assert file.seek(0, 0) == 0
+        assert not file.seekable()
+        assert file.tell() == 0
+        assert file.truncate() == 0
+        assert file.writable() == False
+        assert file.writelines([""]) is None
+        assert next(file) == ""
+        assert next(iter(file)) == ""
+        assert file.fileno() == -1
+        assert file.flush() is None