@stryker-mutator/core/dist/test/helpers/environment-variable-store.js

The extendable JavaScript mutation testing framework

/**
 * A class that lets you manipulate env variables and reset them after a test
 */
export class EnvironmentVariableStore {
    constructor() {
        this.originals = Object.create(null);
    }
    store(key) {
        if (!(key in this.originals)) {
            this.originals[key] = process.env[key];
        }
    }
    set(key, value) {
        this.store(key);
        process.env[key] = value;
    }
    unset(key) {
        this.store(key);
        delete process.env[key];
    }
    restore() {
        Object.keys(this.originals).forEach((key) => {
            const value = this.originals[key];
            if (value === undefined) {
                delete process.env[key];
            }
            else {
                process.env[key] = value;
            }
            delete this.originals[key];
        });
    }
}
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