Add unit testing github action

Author: rbaltrusch

.github/workflows/tests.yaml

@@ -0,0 +1,32 @@
+name: Test
+
+on: [ push, pull_request ]
+
+jobs:
+
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        lua_version: [ "5.4", "5.3", "5.2", "5.1", 'luajit-2.0', 'luajit-2.1' ]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Lua
+        uses: luarocks/gh-actions-lua@master
+        with:
+          luaVersion: ${{ matrix.lua_version }}
+
+      - name: Set up LuaRocks
+        uses: luarocks/gh-actions-luarocks@master
+
+      - name: Setup dependencies
+        run: luarocks install luaunit
+
+      - name: Build luarock
+        run: luarocks build
+
+      - name: Run regression tests
+        run: luarocks test

streams-scm.rockspec.lua

@@ -0,0 +1,47 @@
+rockspec_format = "3.0"
+package = "streams"
+version = "scm"
+
+source = {
+  url = "git+https://github.com/rbaltrusch/stream.lua",
+  branch = "main", -- this will be replaced by the release workflow
+}
+
+description = {
+   summary = "Iterator-chaining library implementing common functional programming patterns such as `map`, `filter`, and `reduce`",
+   detailed = [[
+      This library provides a Java-like `Stream` class that provides a fluent interface of lazily-computed and chainable iterator operations such as `map`, `filter`, and `reduce`. For example:
+
+      ```lua
+      local fn = require "stream"
+      fn.stream{2, 3, 4, 7}
+          :filter(function(x) return x % 2 == 0 end)
+          :map(function(x) return x ^ 2 end)
+          :collect()  -- {4, 16}
+      ```
+   ]],
+   homepage = "https://github.com/rbaltrusch/stream.lua",
+   issues_url = "https://github.com/rbaltrusch/stream.lua/issues",
+   license = "MIT",
+   maintainer = "Richard Baltrusch",
+}
+
+dependencies = {
+   "lua >= 5.1, < 5.4"
+}
+
+test_dependencies = {
+  "luaunit",
+}
+
+build = {
+  type = "builtin",
+  modules = {
+    stream = "stream.lua",
+  },
+}
+
+test = {
+  type = "command",
+  script = "tests/run_tests.lua",
+}