to Config struct for configging

config_test.go

@@ -0,0 +1,23 @@
+package main
+
+import "testing"
+
+func TestNewConfig(t *testing.T) {
+	if got, err := newConfigFromEnv(func(k string) string {
+		t.Logf("getenv(%s)", k)
+		switch k {
+		case "PORT":
+			return "1"
+		case "A_B":
+			return "2"
+		default:
+			return ""
+		}
+	}); err != nil {
+		t.Fatal(err)
+	} else if got.Port != 1 {
+		t.Error(got)
+	} else if got.AB != "2" {
+		t.Error(got)
+	}
+}