idlize

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/*
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 * Copyright (c) 2022-2023 Huawei Device Co., Ltd.
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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import { assert } from "chai"
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import {
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    State,
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    TestNode,
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    contextLocalScope,
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    contextLocalValue,
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    mutableState,
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    testTick,
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} from "../../src"
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const collector = new Array<string>()
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function testExpected(root: State<TestNode>, ...expected: string[]) {
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    collector.length = 0
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    testTick(root)
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    assert.deepEqual(collector, expected)
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    if (expected.length > 0) testExpected(root)
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}
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suite("contextLocal tests", () => {
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    test("contextLocalScope ensures name is not changed", () => {
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        const state = mutableState("first")
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        const root = TestNode.create(() => {
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            contextLocalScope(state.value, "value", () => {
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                collector.push(contextLocalValue(state.value))
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            })
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        })
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        testExpected(root, "value")
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        state.value = "second"
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        assert.throws(() => testTick(root))
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    })
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    test("contextLocalScope propagates state immediately", () => {
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        const state = mutableState("first")
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        const root = TestNode.create(() => {
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            collector.push("ui:" + state.value)
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            contextLocalScope("parameter", state.value, () => {
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                collector.push("state:" + contextLocalValue("parameter"))
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            })
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        })
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        testExpected(root, "ui:first", "state:first")
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        state.value = "second"
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        testExpected(root, "ui:second", "state:second")
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        state.value = "third"
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        testExpected(root, "ui:third", "state:third")
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    })
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})
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