Windows Bazel tests fail in git bash

[mattsoulanille]

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System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow.js):
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Windows 10
• Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device:
• TensorFlow.js installed from (npm or script link):
• TensorFlow.js version (use command below):
• Browser version:
• Tensorflow.js Converter Version:

Describe the current behavior
Bazel builds on Windows work in git bash, but tests fail.
Describe the expected behavior
Tests and builds both work in git bash on Windows.
Standalone code to reproduce the issue

Run yarn test in tfjs-core.

Other info / logs Include any logs or source code that would be helpful to
diagnose the problem. If including tracebacks, please include the full
traceback. Large logs and files should be attached.

Will be posted when I get a chance to run them on a Windows machine.

[qjia7]

After successfully executing yarn build-deps under tfjs-backend-webgl, when run yarn test-dev, below errors are shown:

'external' is not recognized as an internal or external command,
operable program or batch file.

If I directly call bazel test :tfjs-backend-webgl_test --test_output=streamed, below errors are shown:

ERROR(tools/test/windows/tw.cc:1294) ERROR: src/main/native/windows/process.cc(202): CreateProcessW("C:\users\jqin7\_bazel_jqin7\6lxz3o43\execroot\tfjs\bazel-out\x64_windows-fastbuild\bin\tfjs-backend-webgl\tfjs-backend-webgl_test"): %1 is not a valid Win32 application.
 (error: 193)
ERROR(tools/test/windows/tw.cc:1451) Failed to start test process (arg: C:\users\jqin7\_bazel_jqin7\6lxz3o43\execroot\tfjs\bazel-out\x64_windows-fastbuild\bin\tfjs-backend-webgl\tfjs-backend-webgl_test)
FAIL: //tfjs-backend-webgl:tfjs-backend-webgl_test (see C:/users/jqin7/_bazel_jqin7/6lxz3o43/execroot/tfjs/bazel-out/x64_windows-fastbuild/testlogs/tfjs-backend-webgl/tfjs-backend-webgl_test/test.log)
Target //tfjs-backend-webgl:tfjs-backend-webgl_test up-to-date:
  dist/bin/tfjs-backend-webgl/tfjs-backend-webgl_test
INFO: Elapsed time: 102.233s, Critical Path: 45.67s
INFO: 112 processes: 86 internal, 9 local, 17 worker.
INFO: Build completed, 1 test FAILED, 112 total actions
//tfjs-backend-webgl:tfjs-backend-webgl_test                             FAILED in 0.0s