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A lot of bug reports originating from LSP clients are related to either the timing or sequence of editor interactions with gopls (or at least they're originally reported this way). For example: "when I open a package and then create a new file, I lose diagnostics for existing files". These conditions are often hard to reproduce, and to isolate as either a gopls bug or a bug in the editor. Right now we're relying on govim integration tests to catch these regressions, but it's important to also have a testing framework that can exercise this functionality in-process. As a starting point this CL adds test fakes that implement a high level API for scripting editor interactions. A fake workspace can be used to sandbox file operations; a fake editor provides an interface for text editing operations; a fake LSP client can be used to connect the fake editor to a gopls instance. Some tests are added to the lsprpc package to demonstrate the API. The primary goal of these fakes should be to simulate an client that complies to the LSP spec. Put another way: if we have a bug report that we can't reproduce with our regression tests, it should either be a bug in our test fakes or a bug in the LSP client originating the report. I did my best to comply with the spec in this implementation, but it will certainly develop as we write more tests. We will also need to add to the editor API in the future for testing more language features. Updates golang/go#36879 Updates golang/go#34111 Change-Id: Ib81188683a7066184b8a254275ed5525191a2d68 Reviewed-on: https://go-review.googlesource.com/c/tools/+/217598 Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rebecca Stambler <rstambler@golang.org> |
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