diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f348c87..ae75811 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,43 +1,35 @@
-name: kulala tests
+---
+name: Test
+
 on:
-  push:
-    branches:
-      - main
-  pull_request: ~
+  pull_request_review:
+    types: [submitted]
 
+jobs:
   tests:
-    name: tests
+    if: github.event.review.state == 'approved'
+    name: Tests
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
         include:
           - os: ubuntu-22.04
-            rev: v0.10.0/nvim-linux64.tar.gz
+            rev: v0.10.0/nvim.appimage
     steps:
       - uses: actions/checkout@v4
-      - name: Restore cache.
+      - name: Restore cache
         uses: actions/cache@v4
         with:
-          path: _neovim
+          path: |
+            _neovim
+            ~/.local/share/nvim/site/pack/vendor/start
           key: ${{ runner.os }}-${{ matrix.rev }}
 
       - name: Prepare dependencies
-        run: |
-          test -d _neovim || {
-            mkdir -p _neovim
-            curl -sL "https://github.com/neovim/neovim/releases/download/${{ matrix.rev }}" | tar xzf - --strip-components=1 -C "${PWD}/_neovim"
-          }
-          mkdir -p ~/.local/share/nvim/site/pack/vendor/start
-          git clone --depth 1 https://github.com/nvim-lua/plenary.nvim ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim
-          ln -s $(pwd) ~/.local/share/nvim/site/pack/vendor/start
-          export PATH="${PWD}/_neovim/bin:${PATH}"
-          export VIM="${PWD}/_neovim/share/nvim/runtime"
-          nvim --headless -c 'TSInstallSync lua | quit'
+        run: | # TODO: Cache apt dependencies
+          sudo apt-get update && sudo apt-get install -y libfuse2
+          ./scripts/tests.sh prepare ${{ matrix.rev }}
 
       - name: Run tests
-        run: |
-          export PATH="${PWD}/_neovim/bin:${PATH}"
-          export VIM="${PWD}/_neovim/share/nvim/runtime"
-          nvim --version
-          /bin/bash ./scripts/test
+        run: ./scripts/tests.sh run
diff --git a/.gitignore b/.gitignore
index 9a3e221..4b465d2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ http-client.env.json
 *.http
 *graphql-schema.json
 /http-examples
+/_neovim
diff --git a/lua/kulala/parser/curl.lua b/lua/kulala/parser/curl.lua
index 743b3d5..1adf729 100644
--- a/lua/kulala/parser/curl.lua
+++ b/lua/kulala/parser/curl.lua
@@ -92,7 +92,7 @@ function M.parse(curl)
         res.headers["user-agent"] = arg
       elseif state == State.Header then
         local header, value = Stringutils.cut(arg, ":")
-        res.headers[Stringutils.remove_extra_space(header):lower()] = Stringutils.remove_extra_space(value)
+        res.headers[Stringutils.remove_extra_space(header)] = Stringutils.remove_extra_space(value)
       elseif state == State.Body then
         res.body = arg
       end
diff --git a/scripts/test.sh b/scripts/test.sh
deleted file mode 100644
index 15523b4..0000000
--- a/scripts/test.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/bin/bash
-# Copy from MIT licensed neotest plugin: https://raw.githubusercontent.com/nvim-neotest/neotest/master/scripts/test
-tempfile=".test_output.tmp"
-
-if [[ -n $1 ]]; then
-	nvim --headless --noplugin -u tests/init.vim -c "PlenaryBustedFile $1" | tee "${tempfile}"
-else
-	nvim --headless --noplugin -u tests/init.vim -c "PlenaryBustedDirectory tests/ {minimal_init = 'tests/init.vim'}" | tee "${tempfile}"
-fi
-
-# Plenary doesn't emit exit code 1 when tests have errors during setup
-errors=$(sed 's/\x1b\[[0-9;]*m//g' "${tempfile}" | awk '/(Errors|Failed) :/ {print $3}' | grep -v '0')
-
-rm "${tempfile}"
-
-if [[ -n $errors ]]; then
-  echo "Tests failed"
-  exit 1
-fi
-
-exit 0
diff --git a/scripts/tests.sh b/scripts/tests.sh
new file mode 100755
index 0000000..d1589e7
--- /dev/null
+++ b/scripts/tests.sh
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+# Copy from MIT licensed neotest plugin:
+# https://github.com/nvim-neotest/neotest/blob/958a6bff41c7086fe8b46f7f320d0fd073cfc6a0/scripts/test
+
+NVIM_DL_BASE="https://github.com/neovim/neovim/releases/download/"
+
+prepare() {
+  local version=$1
+
+  if [[ ! -f _neovim/nvim ]] && [[ -n $version ]]; then
+    mkdir -p _neovim && curl -sL -o _neovim/nvim "${NVIM_DL_BASE}${version}" && chmod +x _neovim/nvim
+    _neovim/nvim --headless -c 'TSInstallSync lua | quit'
+  fi
+  if [[ ! -d ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim ]]; then
+    git clone --depth 1 \
+      https://github.com/nvim-lua/plenary.nvim \
+      ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim
+  fi
+  if [[ ! -d ~/.local/share/nvim/site/pack/vendor/start/kulala.nvim ]]; then
+    ln -s "$(pwd)" ~/.local/share/nvim/site/pack/vendor/start
+  fi
+}
+
+run() {
+  type _neovim/nvim && nvim() { _neovim/nvim "$@"; }
+
+  local tempfile
+  tempfile=$(mktemp)
+
+  nvim --version
+
+  if [[ -n $1 ]]; then
+    nvim --headless --noplugin -u tests/init.vim -c "PlenaryBustedFile $1" | tee "${tempfile}"
+  else
+    nvim --headless --noplugin -u tests/init.vim -c "PlenaryBustedDirectory tests/ {minimal_init = 'tests/init.vim'}" | tee "${tempfile}"
+  fi
+
+  # Plenary doesn't emit exit code 1 when tests have errors during setup
+  errors=$(sed 's/\x1b\[[0-9;]*m//g' "${tempfile}" | awk '/(Errors|Failed) :/ {print $3}' | grep -v '0')
+
+  if [[ -n $errors ]]; then
+    echo "Tests failed"
+    exit 1
+  fi
+
+  exit 0
+}
+
+main() {
+  local action="$1"
+  shift
+  local args=$*
+  case $action in
+    "run")
+      run "$args"
+      ;;
+    "prepare")
+      prepare "$args"
+      ;;
+    *)
+      echo "Invalid action"
+      exit 1
+      ;;
+  esac
+
+}
+main "$@"
diff --git a/tests/parser/curl_spec.lua b/tests/parser/curl_spec.lua
index bc24615..4e2e68f 100644
--- a/tests/parser/curl_spec.lua
+++ b/tests/parser/curl_spec.lua
@@ -154,6 +154,7 @@ describe("curl parse", function()
     local parsed = CURL.parse(args)
     assert.equal("GET", parsed.method)
     assert.equal("https://example.com/get", parsed.url)
-    assert.equal("value", parsed.headers["header-key"])
+    assert.equal(parsed.headers["header-key"], nil)
+    assert.equal("value", parsed.headers["Header-Key"])
   end)
 end)