diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..7df5b0b
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,43 @@
+name: kulala tests
+on:
+  push:
+    branches:
+      - main
+  pull_request: ~
+
+  tests:
+    name: tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-22.04
+            rev: v0.10.0/nvim-linux64.tar.gz
+    steps:
+      - uses: actions/checkout@v4
+      - name: Restore cache for today's nightly.
+        uses: actions/cache@v4
+        with:
+          path: _neovim
+          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'
+
+      - name: Run tests
+        run: |
+          export PATH="${PWD}/_neovim/bin:${PATH}"
+          export VIM="${PWD}/_neovim/share/nvim/runtime"
+          nvim --version
+          /bin/bash ./scripts/test
diff --git a/lua/kulala/parser/curl.lua b/lua/kulala/parser/curl.lua
index 5a29503..743b3d5 100644
--- a/lua/kulala/parser/curl.lua
+++ b/lua/kulala/parser/curl.lua
@@ -69,6 +69,9 @@ function M.parse(curl)
           res.headers["content-type"] = "application/x-www-form-urlencoded"
         end
       elseif arg == "--json" then
+        if res.method == "" then
+          res.method = "POST"
+        end
         state = State.Body
         res.headers["content-type"] = "application/json"
         res.headers["accept"] = "application/json"
@@ -89,7 +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)] = Stringutils.remove_extra_space(value)
+        res.headers[Stringutils.remove_extra_space(header):lower()] = Stringutils.remove_extra_space(value)
       elseif state == State.Body then
         res.body = arg
       end
diff --git a/scripts/test.sh b/scripts/test.sh
new file mode 100644
index 0000000..15523b4
--- /dev/null
+++ b/scripts/test.sh
@@ -0,0 +1,21 @@
+#!/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/tests/init.vim b/tests/init.vim
new file mode 100644
index 0000000..5b10d82
--- /dev/null
+++ b/tests/init.vim
@@ -0,0 +1,2 @@
+runtime! plugin/plenary.vim
+source tests/minimal_init.lua
diff --git a/tests/minimal_init.lua b/tests/minimal_init.lua
new file mode 100644
index 0000000..bf1c476
--- /dev/null
+++ b/tests/minimal_init.lua
@@ -0,0 +1,9 @@
+local lazypath = vim.fn.stdpath("data") .. "/lazy"
+vim.notify = print
+vim.opt.rtp:append(".")
+vim.opt.rtp:append(lazypath .. "/plenary.nvim")
+vim.opt.swapfile = false
+vim.cmd("runtime! plugin/plenary.vim")
+A = function(...)
+  print(vim.inspect(...))
+end
diff --git a/tests/parser/curl_spec.lua b/tests/parser/curl_spec.lua
new file mode 100644
index 0000000..bc24615
--- /dev/null
+++ b/tests/parser/curl_spec.lua
@@ -0,0 +1,159 @@
+local CURL = require("kulala.parser.curl")
+
+describe("curl parse", function()
+  it("bad command", function()
+    local args = [[urlc 'http://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal(nil, parsed)
+  end)
+
+  it("default GET", function()
+    local args = [[curl 'http://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("http://example.com/get", parsed.url)
+    assert.equal(nil, parsed.data)
+    assert.same({}, parsed.headers)
+    assert.equal("", parsed.http_version)
+  end)
+
+  it("-X PATCH", function()
+    local args = [[curl -X PATCH 'http://example.com/patch']]
+    local parsed = CURL.parse(args)
+    assert.equal("PATCH", parsed.method)
+    assert.equal("http://example.com/patch", parsed.url)
+  end)
+
+  it("--request HEAD", function()
+    local args = [[curl --request HEAD 'http://example.com/head']]
+    local parsed = CURL.parse(args)
+    assert.equal("HEAD", parsed.method)
+    assert.equal("http://example.com/head", parsed.url)
+  end)
+
+  it("-A agent", function()
+    local args = [[curl -A agent 'http://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("http://example.com/get", parsed.url)
+    assert.same({ ["user-agent"] = "agent" }, parsed.headers)
+  end)
+
+  it("--user-agent user/agent", function()
+    local args = [[curl --user-agent user/agent 'http://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("http://example.com/get", parsed.url)
+    assert.same({ ["user-agent"] = "user/agent" }, parsed.headers)
+  end)
+
+  it("-H 'short: header'", function()
+    local args = [[curl -H 'short:header' 'http://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("http://example.com/get", parsed.url)
+    assert.same({ ["short"] = "header" }, parsed.headers)
+  end)
+
+  it("-H 'short: header' --header 'long:header'", function()
+    local args = [[curl -H 'short:header' --header 'long:header' 'http://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("http://example.com/get", parsed.url)
+    assert.same({ ["short"] = "header", ["long"] = "header" }, parsed.headers)
+  end)
+
+  it("-d data", function()
+    local args = [[curl -d data 'https://example.com/post']]
+    local parsed = CURL.parse(args)
+    assert.equal("POST", parsed.method)
+    assert.equal("https://example.com/post", parsed.url)
+    assert.equal("data", parsed.body)
+  end)
+
+  it("-d data -X PUT", function()
+    local args = [[curl -d data -X PUT 'https://example.com/put']]
+    local parsed = CURL.parse(args)
+    assert.equal("PUT", parsed.method)
+    assert.equal("https://example.com/put", parsed.url)
+    assert.equal("data", parsed.body)
+    assert.equal("application/x-www-form-urlencoded", parsed.headers["content-type"])
+  end)
+
+  it("--data data", function()
+    local args = [[curl --data data 'https://example.com/post']]
+    local parsed = CURL.parse(args)
+    assert.equal("POST", parsed.method)
+    assert.equal("https://example.com/post", parsed.url)
+    assert.equal("data", parsed.body)
+    assert.equal("application/x-www-form-urlencoded", parsed.headers["content-type"])
+  end)
+
+  it("--data-raw data", function()
+    local args = [[curl --data-raw data 'https://example.com/post']]
+    local parsed = CURL.parse(args)
+    assert.equal("POST", parsed.method)
+    assert.equal("https://example.com/post", parsed.url)
+    assert.equal("data", parsed.body)
+    assert.equal("application/x-www-form-urlencoded", parsed.headers["content-type"])
+  end)
+
+  it("-d data -H 'content-type: text/plain'", function()
+    local args = [[curl -H 'content-type: text/plain' -d data 'https://example.com/post']]
+    local parsed = CURL.parse(args)
+    assert.equal("POST", parsed.method)
+    assert.equal("https://example.com/post", parsed.url)
+    assert.equal("data", parsed.body)
+    assert.equal("text/plain", parsed.headers["content-type"])
+  end)
+
+  it("--json", function()
+    local args = [[curl --json '{"j": "son"}' 'https://example.com/post']]
+    local parsed = CURL.parse(args)
+    assert.equal("POST", parsed.method)
+    assert.equal("https://example.com/post", parsed.url)
+    assert.equal('{"j": "son"}', parsed.body)
+    assert.equal("application/json", parsed.headers["content-type"])
+    assert.equal("application/json", parsed.headers["accept"])
+  end)
+
+  it("--http1.1", function()
+    local args = [[curl --http1.1 'https://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("https://example.com/get", parsed.url)
+    assert.equal("HTTP/1.1", parsed.http_version)
+  end)
+
+  it("--http2", function()
+    local args = [[curl --http2 'https://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("https://example.com/get", parsed.url)
+    assert.equal("HTTP/2", parsed.http_version)
+  end)
+
+  it("--http3", function()
+    local args = [[curl --http3 'https://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("https://example.com/get", parsed.url)
+    assert.equal("HTTP/3", parsed.http_version)
+  end)
+
+  it("trim header value", function()
+    local args = [[curl -H 'key:    value    ' 'https://example.com/get']]
+    local parsed = CURL.parse(args)
+    assert.equal("GET", parsed.method)
+    assert.equal("https://example.com/get", parsed.url)
+    assert.equal("value", parsed.headers["key"])
+  end)
+
+  it("header key case", function()
+    local args = [[curl -H 'Header-Key:value' 'https://example.com/get']]
+    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"])
+  end)
+end)