text: // test
  import test from 'ava';
  import {
    ARRAY,
    BOOLEAN,
    DECIMAL,
    FUNCTION,
    NAN,
    NEGATIVE_INTEGER,
    OBJECT,
    POSITIVE_INTEGER,
    STRING,
    UNDEFINED
  } from 'test/helpers/_typeCheckValues';
  
  // src
  import isNumber from 'src/_utils/isNumber';
  
  test('if isNumber tests if an object is a number', (t) => {
    t.false(isNumber(ARRAY));
    t.false(isNumber(BOOLEAN));
    t.false(isNumber(FUNCTION));
    t.false(isNumber(NAN));
    t.false(isNumber(STRING));
    t.false(isNumber(OBJECT));
    t.false(isNumber(UNDEFINED));
  
    t.true(isNumber(DECIMAL));
    t.true(isNumber(NEGATIVE_INTEGER));
    t.true(isNumber(POSITIVE_INTEGER));
  });
  