add integration test

.github/workflows/integration-test.yml

+name: integration-test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: integration-test
+      run: ./integration-test.sh

init.lua

@@ -71,3 +71,7 @@ end
 
 
 print("[OK] Mapserver")
+
+if minetest.settings:get_bool("enable_mapserver_integration_test") then
+        dofile(MP.."/integration_test.lua")
+end

integration-test.sh

+#!/bin/sh
+# simple integration test
+
+CFG=/tmp/minetest.conf
+MTDIR=/tmp/mt
+WORLDDIR=${MTDIR}/worlds/world
+
+cat <<EOF > ${CFG}
+ enable_mapserver_integration_test = true
+EOF
+
+mkdir -p ${WORLDDIR}
+chmod 777 ${MTDIR} -R
+docker run --rm -i \
+	-v ${CFG}:/etc/minetest/minetest.conf:ro \
+	-v ${MTDIR}:/var/lib/minetest/.minetest \
+	-v $(pwd):/var/lib/minetest/.minetest/worlds/world/worldmods/mapserver \
+	registry.gitlab.com/minetest/minetest/server:5.2.0
+
+test -f ${WORLDDIR}/integration_test.json && exit 0 || exit 1

integration_test.lua

+
+minetest.log("warning", "[TEST] integration-test enabled!")
+
+minetest.register_on_mods_loaded(function()
+	minetest.after(1, function()
+
+		local data = minetest.write_json({ success = true }, true);
+		local file = io.open(minetest.get_worldpath().."/integration_test.json", "w" );
+		if file then
+			file:write(data)
+			file:close()
+		end
+
+		file = io.open(minetest.get_worldpath().."/registered_nodes.txt", "w" );
+		if file then
+			for name in pairs(minetest.registered_nodes) do
+				file:write(name .. '\n')
+			end
+			file:close()
+		end
+
+		minetest.log("warning", "[TEST] integration tests done!")
+		minetest.request_shutdown("success")
+	end)
+end)

readme.md

@@ -2,6 +2,7 @@
 # mapserver mod
 
 ![](https://github.com/minetest-mapserver/mapserver_mod/workflows/luacheck/badge.svg)
+![](https://github.com/minetest-mapserver/mapserver_mod/workflows/integration-test/badge.svg)
 
 This is the complementary mod for the mapserver: https://github.com/minetest-tools/mapserver