diff --git a/.github/workflows/emacs-test.yml b/.github/workflows/emacs-test.yml
index aa41e7b61..4a62a3ae7 100644
--- a/.github/workflows/emacs-test.yml
+++ b/.github/workflows/emacs-test.yml
@@ -11,7 +11,7 @@ on:
 
 jobs:
   test:
-    name: Test PSES with Emacs via Eglot
+    name: Test via Eglot
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
diff --git a/.github/workflows/vim-test.yml b/.github/workflows/vim-test.yml
new file mode 100644
index 000000000..5dcf11f88
--- /dev/null
+++ b/.github/workflows/vim-test.yml
@@ -0,0 +1,53 @@
+name: "Vim"
+
+on:
+  push:
+    branches: [ main ]
+    tags: [ v* ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+    paths-ignore: [ '**/*.md' ]
+
+jobs:
+  test:
+    name: Test via LanguageClient-neovim
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Build PSES
+        shell: pwsh
+        run: tools/azurePipelinesBuild.ps1
+
+      - name: Install Vim
+        uses: rhysd/action-setup-vim@v1
+        id: vim
+
+      - name: Checkout vim-ps1
+        uses: actions/checkout@v3
+        with:
+          repository: PProvost/vim-ps1
+          path: vim-ps1
+
+      - name: Checkout LanguageClient-neovim
+        uses: actions/checkout@v3
+        with:
+          repository: autozimu/LanguageClient-neovim
+          path: LanguageClient-neovim
+
+      - name: Install LanguageClient-neovim
+        run: ./install.sh
+        working-directory: LanguageClient-neovim
+
+      - name: Checkout Themis
+        uses: actions/checkout@v3
+        with:
+          repository: thinca/vim-themis
+          path: vim-themis
+
+      - name: Run Themis
+        env:
+          THEMIS_VIM: ${{ steps.vim.outputs.executable }}
+        run: ./vim-themis/bin/themis ./test/vim-test.vim
diff --git a/test/.themisrc b/test/.themisrc
new file mode 100644
index 000000000..d684e00fa
--- /dev/null
+++ b/test/.themisrc
@@ -0,0 +1,6 @@
+filetype plugin on
+
+let g:repo_root = fnamemodify(expand('<sfile>'), ':h:h')
+
+call themis#option('runtimepath', g:repo_root . '/LanguageClient-neovim')
+call themis#option('runtimepath', g:repo_root . '/vim-ps1')
diff --git a/test/vim-test.ps1 b/test/vim-test.ps1
new file mode 100644
index 000000000..8175124cc
--- /dev/null
+++ b/test/vim-test.ps1
@@ -0,0 +1 @@
+function Do-Work {}
diff --git a/test/vim-test.vim b/test/vim-test.vim
new file mode 100644
index 000000000..05c8919fd
--- /dev/null
+++ b/test/vim-test.vim
@@ -0,0 +1,44 @@
+let s:suite = themis#suite('pses')
+let s:assert = themis#helper('assert')
+
+function s:suite.before()
+  let l:pses_path = g:repo_root . '/module'
+  let g:LanguageClient_serverCommands = {
+    \ 'ps1': ['pwsh', '-NoLogo', '-NoProfile', '-Command',
+    \   l:pses_path . '/PowerShellEditorServices/Start-EditorServices.ps1',
+    \   '-HostName', 'vim', '-HostProfileId', 'vim', '-HostVersion', '1.0.0',
+    \   '-BundledModulesPath', l:pses_path, '-Stdio',
+    \   '-LogPath', g:repo_root . '/pses.log', '-LogLevel', 'Diagnostic',
+    \   '-SessionDetailsPath', g:repo_root . '/pses_session.json' ]
+    \ }
+  let g:LanguageClient_serverStderr = 'DEBUG'
+  let g:LanguageClient_loggingFile = g:repo_root . '/LanguageClient.log'
+  let g:LanguageClient_serverStderr = g:repo_root . '/LanguageServer.log'
+endfunction
+
+function s:suite.has_language_client()
+  call s:assert.includes(&runtimepath, g:repo_root . '/LanguageClient-neovim')
+  call s:assert.cmd_exists('LanguageClientStart')
+  call s:assert.not_empty(g:LanguageClient_serverCommands)
+  call s:assert.true(LanguageClient#HasCommand('ps1'))
+endfunction
+
+function s:suite.analyzes_powershell_file()
+  view test/vim-test.ps1 " This must not use quotes!
+
+  let l:bufnr = bufnr('vim-test.ps1$')
+  call s:assert.not_equal(l:bufnr, -1)
+  let l:bufinfo = getbufinfo(l:bufnr)[0]
+
+  call s:assert.equal(l:bufinfo.name, g:repo_root . '/test/vim-test.ps1')
+  call s:assert.includes(getbufline(l:bufinfo.name, 1), 'function Do-Work {}')
+  " TODO: This shouldn't be necessary, vim-ps1 works locally but not in CI.
+  call setbufvar(l:bufinfo.bufnr, '&filetype', 'ps1')
+  call s:assert.equal(getbufvar(l:bufinfo.bufnr, '&filetype'), 'ps1')
+
+  execute 'LanguageClientStart'
+  execute 'sleep' 5
+  call s:assert.equal(getbufvar(l:bufinfo.name, 'LanguageClient_isServerRunning'), 1)
+  call s:assert.equal(getbufvar(l:bufinfo.name, 'LanguageClient_projectRoot'), g:repo_root)
+  call s:assert.equal(getbufvar(l:bufinfo.name, 'LanguageClient_statusLineDiagnosticsCounts'), {'E': 0, 'W': 1, 'H': 0, 'I': 0})
+endfunction