polygerrit: Add note in README about npm install
When installing web-component-tester fails with the error: "EACCES: permission denied, mkdir" it can be fixed by adding the `--unsafe-perm=true --allow-root` options as described in [1]. [1] https://github.com/npm/npm/issues/17268#issuecomment-310167614 Change-Id: I397d31209c019ebbe52bf24bd9e359d71863ffd7
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@@ -90,6 +90,9 @@ brew install npm
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sudo npm install -g web-component-tester
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```
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Note: it may be necessary to add the options `--unsafe-perm=true --allow-root`
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to the `npm install` command to avoid file permission errors.
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Run all web tests:
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```sh
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