Added GitHub CI

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: test
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: "51 3 * * 6" # Runs at 03:51, only on Saturday
+jobs:
+  build:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu", "macos"]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - uses: crystal-lang/install-crystal@v1
+        with:
+          crystal: latest
+      - name: Install dependencies
+        run: shards install --without-development --release
+      - name: Run specs
+        run: crystal spec

spec/htsgrid_spec.cr

@@ -1,9 +1,8 @@
 require "./spec_helper"
+require "../src/htsgrid/version"
 
-describe Htsgrid do
-  # TODO: Write tests
-
-  it "works" do
-    false.should eq(true)
+describe "HTSGrid::VERSION" do
+  it "should be a string" do
+    HTSGrid::VERSION.should be_a(String)
   end
 end

spec/spec_helper.cr

@@ -1,2 +1 @@
 require "spec"
-require "../src/htsgrid"