Update README to include instructions on how to run tests

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@@ -41,3 +41,14 @@ For more examples check the [Wiki](https://github.com/bubba/lsp-test/wiki/Introd
 To test make sure you have the following language servers installed:
 - [haskell-ide-engine](https://github.com/haskell/haskell-ide-engine)
 - [javascript-typescript-langserver](https://github.com/sourcegraph/javascript-typescript-langserver)
+
+## How to run tests
+
+The present tests are integration tests. Thus, it is required that that the executables `hie` and `javascript-typescript-langserver` are on the path.
+
+The executable `hie` has to have been built using GHC 8.6.2. This can be done by cloning [Haskell-IDE-Engine](https://github.com/haskell/haskell-ide-engine) and invoking `stack install.hs build-8.6.2`. This will create the executables `hie`, `hie-8.6` and `hie-8.6.2` in your `$HOME/.local/bin`, or respective `stack path --local-bin` location.
+To make sure the test environment is identical to the travis setup, in `.travis.yml` you can find the exact git hash that has been used to execute the tests and build `hie` from that snapshot.
+
+The language server `javascript-typescript-langserver` can be installed by invoking `npm i -g javascript-typescript-langserver`.
+
+When all prerequisites have been met, the tests can be executed by running `stack test`.
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