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/*
This file is part of GNU Taler
(C) 2018-2019 GNUnet e.V.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Type-safe codecs for converting from/to JSON.
*/
import test from "ava";
import {
Codec,
buildCodecForObject,
codecForConstString,
codecForString,
buildCodecForUnion,
} from "./codec.js";
interface MyObj {
foo: string;
}
interface AltOne {
type: "one";
foo: string;
}
interface AltTwo {
type: "two";
bar: string;
}
type MyUnion = AltOne | AltTwo;
test("basic codec", (t) => {
const myObjCodec = buildCodecForObject<MyObj>()
.property("foo", codecForString())
.build("MyObj");
const res = myObjCodec.decode({ foo: "hello" });
t.assert(res.foo === "hello");
t.throws(() => {
myObjCodec.decode({ foo: 123 });
});
});
test("union", (t) => {
const altOneCodec: Codec<AltOne> = buildCodecForObject<AltOne>()
.property("type", codecForConstString("one"))
.property("foo", codecForString())
.build("AltOne");
const altTwoCodec: Codec<AltTwo> = buildCodecForObject<AltTwo>()
.property("type", codecForConstString("two"))
.property("bar", codecForString())
.build("AltTwo");
const myUnionCodec: Codec<MyUnion> = buildCodecForUnion<MyUnion>()
.discriminateOn("type")
.alternative("one", altOneCodec)
.alternative("two", altTwoCodec)
.build<MyUnion>("MyUnion");
const res = myUnionCodec.decode({ type: "one", foo: "bla" });
t.is(res.type, "one");
if (res.type == "one") {
t.is(res.foo, "bla");
}
});
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