message: Edit test/README.md
diff: ### Executing tests
  -We start a new VS Code instance each `fixture` directory in `fixtures/build/` and `fixtures/viewer/`, and execute an appropriate test defined in `build.test.ts` while skipping other tests not related to the directory. Each test tries to build a TeX file in the directory. If a PDF file is not generated, the test fails. With this approach, we can debug the extension by opening a TeX file in the `fixture` directory if the test fails.
  +We start a new VS Code instance each `fixture` directory in `fixtures/build/` and others, and execute an appropriate test defined in `build.test.ts` while skipping other tests not related to the directory. Fot tests of building a LaTeX file, we try to build a LaTeX file in the directory. If a PDF file is not generated, the test fails. With this approach, we can debug the extension by opening a TeX file in the `fixture` directory if the test fails.
  +
  +- `runTest.ts` starts a new VS Code instance each `fixture` directory.
  +- `*.index.ts` runs all the tests defined in `*.test.ts`.
  +- Tests in `*.test.ts` are executed through `runTestWithFixture`.
  +- `runTestWithFixture` skip tests in `*.test.ts` if they are not related to the current `fixture` directory.
  