qa_is_isogram/src/isIsogram.test.js at 46367db840b50171675e778bccade65809de2d58 · mate-academy/qa_is_isogram · GitHub

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'use strict';

describe('isIsogram', () => {
  const { isIsogram } = require('./isIsogram');

  it(`should be declared`, () => {
    expect(isIsogram).toBeInstanceOf(Function);
  });

  it(`should return true for an empty line`, () => {
    expect(isIsogram(''))
      .toBe(true);
  });

  it(`should return false for words with repeating letters`, () => {
    expect(isIsogram('look'))
      .toBe(false);

    expect(isIsogram('oops'))
      .toBe(false);

    expect(isIsogram('adam'))
      .toBe(false);
  });

  it(`should be case insensitive`, () => {
    expect(isIsogram('Adam'))
      .toBe(false);

    expect(isIsogram('oOps'))
      .toBe(false);

    expect(isIsogram('bOo'))
      .toBe(false);
  });

  it(`should return true for a valid isogram`, () => {
    expect(isIsogram('playgrounds'))
      .toBe(true);

    expect(isIsogram('isogram'))
      .toBe(true);

    expect(isIsogram('false'))
      .toBe(true);
  });
});