greet: DI

greet/greet_test.go

@@ -0,0 +1,17 @@
+package greet
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestGreet(t *testing.T) {
+	buffer := bytes.Buffer{}
+	Greet(&buffer, "Chris")
+	got := buffer.String()
+	want := "Hello, Chris"
+
+	if got != want {
+		t.Errorf("got %q want %q", got, want)
+	}
+}

greet/main.go

@@ -0,0 +1,19 @@
+package greet
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+func Greet(writer io.Writer, name string) {
+	fmt.Fprintf(writer, "Hello, %s", name)
+}
+
+func MyGreeterHandler(w http.ResponseWriter, r *http.Request) {
+	Greet(w, "world")
+}
+
+// func main() {
+// 	log.Fatal(http.ListenAndServe(":5001", http.HandlerFunc(MyGreeterHandler)))
+// }