diff --git a/.gitea/workflows/ci.yaml b/.gitea/workflows/ci.yaml
new file mode 100644
index 0000000..98962ed
--- /dev/null
+++ b/.gitea/workflows/ci.yaml
@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.21'
+
+      - name: Run tests
+        run: go test -v ./...
+
+      - name: Build
+        run: go build -o ci-test .
+
+      - name: Run binary
+        run: ./ci-test
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..0d006dd
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module ci-test
+
+go 1.21
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..96d474e
--- /dev/null
+++ b/main.go
@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func Add(a, b int) int {
+    return a + b
+}
+
+func Greet(name string) string {
+    return fmt.Sprintf("Hello, %s!", name)
+}
+
+func main() {
+    fmt.Println(Greet("CI/CD"))
+    fmt.Println("2 + 3 =", Add(2, 3))
+}
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..7c63a62
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,28 @@
+package main
+
+import "testing"
+
+func TestAdd(t *testing.T) {
+    tests := []struct {
+        a, b, want int
+    }{
+        {2, 3, 5},
+        {0, 0, 0},
+        {-1, 1, 0},
+        {100, 200, 300},
+    }
+    for _, tt := range tests {
+        got := Add(tt.a, tt.b)
+        if got != tt.want {
+            t.Errorf("Add(%d, %d) = %d, want %d", tt.a, tt.b, got, tt.want)
+        }
+    }
+}
+
+func TestGreet(t *testing.T) {
+    got := Greet("World")
+    want := "Hello, World!"
+    if got != want {
+        t.Errorf("Greet(World) = %q, want %q", got, want)
+    }
+}