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Update snippets README.md to include more detail (#57152)

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Just adding some more details to the snippets README.md file about testing snippets.
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Greg Spencer 2020-05-26 09:17:55 -07:00 committed by GitHub
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@ -225,4 +225,14 @@ Instead, you can run the analysis locally with this command from the Flutter roo
TMPDIR=/tmp bin/cache/dart-sdk/bin/dart dev/bots/analyze-sample-code.dart --temp=samples
```
This will analyze the samples, and leave the output in /tmp/samples
This will analyze the samples, and leave the generated files in `/tmp/samples`
You can find the sample you are working on in `/tmp/samples`. It is named using the
path to the file it is in, and the line of the file that the `{@tool ...}` directive
is on.
For example, the file `sample.src.widgets.animated_list.52.dart` points to the sample
in `packages/flutter/src/widgets/animated_list.dart` at line 52. You can then take the
contents of that file, and paste it into [Dartpad](https://dartpad.dev) and see if it
works. If the sample relies on new features that have just landed, it may not work
until the features make it into the `dev` branch.