add testing framework

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cloning repo
+        uses: actions/checkout@v4
+
+      - name: Run tests
+        run: "./run_tests.sh"
+

Dockerfile

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+FROM nickblah/luajit:2-luarocks
+
+RUN apt-get update && apt-get install -y build-essential
+
+RUN luarocks install busted
+RUN echo "$(luarocks path --bin)" >> ~/.profile
+
+# install neovim
+RUN <<EOF
+curl -LO https://github.com/neovim/neovim/releases/latest/download/nvim-linux64.tar.gz
+rm -rf /opt/nvim
+tar -C /opt -xzf nvim-linux64.tar.gz
+EOF
+
+ENV PATH="$PATH:/opt/nvim-linux64/bin"
+
+CMD ["/bin/bash", "-c", "cd ~/test && busted ."]

run_tests.sh

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+#!/bin/bash
+
+docker build -t tronikel/conflict-marker.nvim-test .
+
+docker run --rm \
+    -v ./lua:/root/.config/nvim/lua/ \
+    -v ./test:/root/test/ \
+    tronikel/conflict-marker.nvim-test:latest

test/.busted

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+return {
+    _all = {
+        lua = "./lua.sh",
+    },
+}

test/lua.sh

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+#!/bin/bash
+
+nvim -c "set loadplugins" -l "$@"

test/main_spec.lua

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+describe("main", function()
+    local nvim
+
+    local buf
+    local lines
+
+    before_each(function()
+        buf = 0
+        lines = {
+            [[<<<<<<< HEAD]],
+            [[local value = 5 + 7]],
+            [[print(value)]],
+            [[print(string.format("value is %d", value))]],
+            [[=======]],
+            [[local value = 1 - 1]],
+            [[>>>>>>> new_branch]],
+        }
+
+        nvim = vim.fn.jobstart(
+            { "nvim", "--embed", "--headless", "-c", 'lua require("conflict-marker").setup()' },
+            { rpc = true }
+        )
+        vim.fn.rpcrequest(nvim, "nvim_buf_set_lines", buf, 0, -1, true, lines)
+    end)
+
+    after_each(function()
+        vim.fn.jobstop(nvim)
+    end)
+
+    it("sets lines correctly", function()
+        local result = vim.fn.rpcrequest(nvim, "nvim_buf_get_lines", buf, 0, -1, true)
+        assert.is_same(result, lines)
+    end)
+end)