The API supporting Codever is written in Node.js/ExpressJs, and I’ve decided to use Jest as the testing framework for unit testing. This blog post presents the steps required to install and run the first unit test in Jest for this backend.

In the following example we define template attribute to be of type String with values defined in the enum array:

const noteSchema = new Schema({
    title: {type:String, required: true},
    type: {type:String, required: true, default: 'note'},
    content: String,
    reference: String,
    tags: [String],
    template: {type:String, enum: ['note', 'checklist']},
    userId: {type: String, ref:'User'},
    __v: { type: Number, select: false}
},
{
  timestamps: true
});

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To set the initial value of the input control, just use the value attribute:

<input type="text" class="form-control" placeholder="Generate Codever sharable Url"
       aria-describedby="basic-addon2"
value="">

Project: codever - File: social-share-dialog.component.html

To understand usage of angular environment used in this snippet (environment.HOST) see the Configure and use environment specific values in Angular and html template snippet

Reference - https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input

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Let’s test with Jest the following isInfiniteDate function, which checks whether the given date is “infinite” in the given context:

export const isInfiniteDate = (input: string): boolean => {
    const maximumDatePossible = '9999-12-31';
    return new Date(input).getTime() === new Date(maximumDatePossible).getTime();
};

For sure, we want to test different dates with the same expected result, either true or false

To avoid “duplication” of same test with different data, you can use test.each(table)(name, fn, timeout) function, to which you can pass an Array of Arrays with the arguments that are passed into the test fn for each row.

describe('isInfiniteDate > ', () => {
    test.each([
        [null, false],
        [undefined, false],
        ['AXON', false],
        ['2021-31-31', false],
        ['2021-12-12', false],
        ['9999-12-31', true],
    ])('given input date %p , it should return %p ', (input, expected) => {
        expect(isInfiniteDate(input)).toEqual(expected);
    });
});

• name is the String title of the test block - See the referenced link for the different formatting options
• optionally, you can provide a timeout (in milliseconds) for specifying how long to wait for each row before aborting. The default timeout is 5 seconds.

This is the equivalent of @ParameterizedTest in Java

Reference - https://jestjs.io/docs/api#testeachtablename-fn-timeout

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Get current date with new Date() and setHours to 0, 0, 0 and then you are ready to compare with the input date, which is a string in the yyyy-MM-dd format

export const isLessThanToday = (input: string): boolean => { //format of input date is YYYY-MM-DD
    const today = new Date();
    today.setHours(0, 0, 0);

    return notEmpty(input) && new Date(input) < today;
};

To test that we can use the following jest test:

    describe('isLessThanToday > ', () => {
        test.each([
            [null, false],
            [undefined, false],
            ['AXON', false],
            ['1900-01-01', true],
            ['2099-12-12', false], // TODO change this date when in 2099 :)
            [new Date().toISOString().slice(0, 10), false], //today
            [new Date(new Date().setDate(new Date().getDate() - 1)).toISOString().slice(0, 10), true], //yesterday
            [new Date(new Date().setDate(new Date().getDate() - 7)).toISOString().slice(0, 10), true], //one week ago
        ])('given input date %p, it should return %p', (input, expected) => {
            expect(isLessThanToday(input)).toEqual(expected);
        });
    });

See this How to use jest test.each function to understand the usage of test.each function

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