add test

.woodpecker.yml

@@ -3,7 +3,15 @@ when:
     branch: main
 
 steps:
-  build:
+  go-test:
+      image: golang:1.24
+      environment:
+        CGO_ENABLED: 0
+        GOOS: linux
+        GOARCH: amd64
+      commands:
+        - go test ./...
+  go-build:
     image: golang:1.24
     environment:
       CGO_ENABLED: 0

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"net/http"
+	"strconv"
 )
 
 const (
@@ -21,6 +22,15 @@ func main() {
 	mux.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
 		json.NewEncoder(w).Encode(map[string]string{"version": version})
 	})
+	mux.HandleFunc("/sum", func(w http.ResponseWriter, r *http.Request) {
+		a, _ := strconv.Atoi(r.URL.Query().Get("a"))
+		b, _ := strconv.Atoi(r.URL.Query().Get("b"))
+		json.NewEncoder(w).Encode(map[string]int{"result": sum(a, b)})
+	})
 
 	http.ListenAndServe(":8080", mux)
 }
+
+func sum(a, b int) int {
+	return a + b
+}

main_test.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"testing"
+)
+
+func Test_sum(t *testing.T) {
+	tests := []struct {
+		a, b int
+		want int
+	}{
+		{1, 2, 3},
+		{-1, 1, 0},
+		{0, 0, 0},
+	}
+
+	for _, test := range tests {
+		if got := sum(test.a, test.b); got != test.want {
+			t.Errorf("sum(%d, %d) = %d, want %d", test.a, test.b, got, test.want)
+		}
+	}
+}