package mailparser_test

import "testing"

func TestReturnPath(t *testing.T) {
	tests := []struct {
		name    string
		headers string
		want    string
	}{
		{"none", "", ""},
		{"simple", "Return-Path: <Forwarder@Example.COM>\r\n", "forwarder@example.com"},
		{"without brackets", "Return-Path: fwd@example.com\r\n", "fwd@example.com"},
		{"topmost only", "Return-Path: <fwd@example.com>\r\nReceived: from x\r\nReturn-Path: <orig@example.net>\r\n", "fwd@example.com"},
		{"null sender", "Return-Path: <>\r\n", ""},
		{"null sender topmost hides lower", "Return-Path: <>\r\nReturn-Path: <orig@example.net>\r\n", ""},
		{"garbage", "Return-Path: not an address\r\n", ""},
		{"empty", "Return-Path: \r\n", ""},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			pm := parseHeaders(t, tt.headers)
			if pm.ReturnPath != tt.want {
				t.Errorf("ReturnPath = %q, want %q", pm.ReturnPath, tt.want)
			}
		})
	}
}