toBeValidDotAndMatchSnapshot test failed on Windows

[kamiazya]

Describe the bug

Running a test using .toBeValidDotAndMatchSnapshot on Windows causes an error on Graphviz.

● function digraph › root create function › no parameters

    Format: "plain" not recognized. Use one of:

      94 |       expect(g.size).toBe(size);
      95 |       expect(g.strict).toBe(strict);
    > 96 |       expect(toDot(g)).toBeValidDotAndMatchSnapshot();
         |                        ^
      97 |     });
      98 |   });
      99 | 

Expected behavior

The test can be run successfully on Windows.

Additional context

Graphviz for Windows was updated on 21 Nov 2020.

Available at: https://chocolatey.org/packages/Graphviz

[kamiazya]

When Graphviz of chocolatey was upgraded to version 2.44, there was a bug that the output format could not be specified.
This problem seemed to be avoided only by specifying the version of Graphviz to be installed to the 2.38 version.