packages/util/src/string/upperFirst.spec.ts
// Copyright 2017-2024 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
/// <reference types="@polkadot/dev-test/globals.d.ts" />
import { perf } from '../test/index.js';
import { stringUpperFirst } from './index.js';
describe('stringUpperFirst', (): void => {
it("uppers the first letter if it's a capital letter", (): void => {
expect(
stringUpperFirst('ABC')
).toBe('ABC');
});
it("uppers the first letter if it's a lowercase letter", (): void => {
expect(
stringUpperFirst('abc')
).toBe('Abc');
});
it("uppers the first letter if it's a lowercase letter (String)", (): void => {
expect(
stringUpperFirst(String('abc'))
).toBe('Abc');
});
it('returns undefined as empty', (): void => {
expect(
stringUpperFirst()
).toBe('');
});
it('returns null as empty', (): void => {
expect(
stringUpperFirst(null)
).toBe('');
});
perf('stringUpperFirst', 1_000_000, [['helloWorldSomething']], stringUpperFirst);
});