Method match

packages/alphatab/test/PrettyFormat.ts:983–1013

* Matches the given snapshot with the contained one. * @param name The name of the snapshot * @param value The raw value for which to create the snapshot * @returns An error message if there was a match error, if they match null

(name: string, value: unknown)

     * @returns An error message if there was a match error, if they match null
     */
    public match(name: string, value: unknown): string | null {
        const expected = this.snapshots.get(name)?.split('\n');
        if (expected === undefined) {
            return `No snapshot '${name}' found`;
        }

        // https://github.com/jestjs/jest/blob/8e683abe2a1d3f6f6513dd9467f0f49d3d2ffc0d/packages/jest-snapshot-utils/src/utils.ts#L190C51-L190C70
        const actual = SnapshotFile._printBacktickString(PrettyFormat.format(value, SnapshotFile._matchOptions)).split(
            '\n'
        );

        const lines = Math.min(expected.length, actual.length);
        const errors: string[] = [];

        if (expected.length !== actual.length) {
            errors.push(`Expected ${expected.length} lines, but only got ${actual.length}`);
        }

        for (let i = 0; i < lines; i++) {
            if (actual[i].trimEnd() !== expected[i].trimEnd()) {
                errors.push(`Error on line ${i + 1}: `);
                errors.push(`+ ${actual[i]}`);
                errors.push(`- ${expected[i]}`);
            }
        }

        if (errors.length > 0) {
            return errors.join('\n');
        }
        return null;
    }

    // https://github.com/jestjs/jest/blob/8e683abe2a1d3f6f6513dd9467f0f49d3d2ffc0d/packages/jest-snapshot-utils/src/utils.ts#L167-L171
    private static _printBacktickString(str: string) {