Test failed on Windows

[ygj6]

I found a test failure on windows, Here is my platform version:

    windows 10
    Node 14.6.0
    Yarn 1.22.10
    VS Code 1.51.1

My compile and test process:

    npm run build
    npm run test

Error Message:

$ BABEL_TEST=1 jest
'BABEL_TEST'  is not an internal or external command, nor an executable program or batch file.
error Command failed with exit code 1.