ci: add Github Actions test workflow

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: Tests
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: ['1.22']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v4
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Install dependencies
+        run: go get .
+
+      - name: Test
+        run: make test

Makefile

@@ -0,0 +1,2 @@
+test:
+  go test -race -cover -count 1

README.md

@@ -1,5 +1,7 @@
 # pubsub
 
+[![Tests](https://github.com/mdawar/pubsub/actions/workflows/test.yml/badge.svg?branch=main&event=push)](https://github.com/mdawar/pubsub/actions)
+
 `pubsub` is a simple and generic **topic-based** **publish/subscribe** library for in-process communication in **Go**.
 
 ## Installation
@@ -115,3 +117,13 @@ topicsCount := broker.NumTopics()
 // Get the subscribers count on a specific topic.
 count := broker.Subs("events")
 ```
+
+## Tests
+
+```sh
+go test -race -cover
+# If you have "just" installed.
+just test
+# Or using make.
+make test
+```