package appconfig

import "testing"

func TestApplyAgentVars(t *testing.T) {
	in := []byte("A=1\nCARLOS_PURGE=socket\nB=2\nCARLOS_CONTROL_SOCKET=/tmp/x\n")
	got := string(applyAgentVars(in))
	want := "A=1\nB=2\nCARLOS_PURGE=header\n"
	if got != want {
		t.Fatalf("got %q want %q", got, want)
	}
	if again := string(applyAgentVars([]byte(got))); again != want {
		t.Fatalf("not idempotent: %q", again)
	}
	if got := string(applyAgentVars(nil)); got != "CARLOS_PURGE=header\n" {
		t.Fatalf("empty render: got %q", got)
	}
}