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HG's additions to jest testing framework as a git submodule

This add on introduces these matchers:

• expect( something ).toBeIsoDateString() tests for a string data in standard format, e.g. YYYY-MM-DDTHH:MM:SS.
• expect( something).toBeNonEmptyString() tests for a non-empty string
• expect( something).toBeString() tests for a string
• expect( something).toBeArray() tests for a any[]
• expect( something).toBeStringArray() tests for a string[]
• expect( something).toBeNumberArray() tests for a number[]
• expect( something).toBeNumber() tests for a number
• expect( something).toBeBoolean() tests for a boolean
• expect( something).toBeRegularObject() tests for a regular object

Your test file must also import:

import "../fi/hg/jest/matchers/index.d";
import "../fi/hg/jest/matchers";

And your main Jest configuration must include setupFilesAfterEnv:

/** @type {import('@ts-jest/dist/types').InitialOptionsTsJest} */
module.exports = {
    // ...
    
    setupFilesAfterEnv: [
        "./src/fi/hg/jest/matchers/index.ts"
    ]
    
};