--- /dev/null
+Before:
+ call ale#assert#SetUpLinterTest('haskell', 'hls')
+
+ Save &filetype
+ let &filetype = 'haskell'
+
+After:
+ call ale#assert#TearDownLinterTest()
+
+Execute(The language string should be correct):
+ AssertLSPLanguage 'haskell'
+
+Execute(The default executable should be correct):
+ AssertLinter 'haskell-language-server-wrapper',
+ \ ale#Escape('haskell-language-server-wrapper') . ' --lsp'
+
+Execute(The project root should be detected correctly):
+ AssertLSPProject g:dir
+
+ call ale#test#SetFilename('hls_paths/file.hs')
+
+ AssertLSPProject ale#path#Simplify(g:dir . '/hls_paths')
+
+Execute(The executable should be configurable):
+ let g:ale_haskell_hls_executable = 'foobar'
+
+ AssertLinter 'foobar', ale#Escape('foobar') . ' --lsp'
+
+Execute(Should accept configuration settings):
+ AssertLSPConfig {}
+ let b:ale_haskell_hls_config = {'haskell': {'maxCompletions': 250}}
+ AssertLSPConfig {'haskell': {'maxCompletions': 250}}
+
+Execute(We should detect the root with cabal.project files, preferred over *.cabal files):
+ call ale#test#SetFilename('../test-files/haskell/haskell-packages-project/package-a/src/folder/dummy.hs')
+
+ AssertLSPProject ale#test#GetFilename('../test-files/haskell/haskell-packages-project')
+
+Execute(We should a project root with *.cabal files):
+ call ale#test#SetFilename('../test-files/haskell/haskell-simple-package/package-a/src/folder/dummy.hs')
+
+ AssertLSPProject ale#test#GetFilename('../test-files/haskell/haskell-simple-package/package-a')