Number

Use .toBeNumber when checking if a value is a Number.

test('passes when value is a number', () => {
  expect(1).toBeNumber();
  expect(NaN).toBeNumber();
  expect(Infinity).toBeNumber();
  expect(true).not.toBeNumber();
});

Tests

.toBeNaN()

Use .toBeNaN when checking a value is NaN.

test('passes when value is NaN', () => {
  expect(NaN).toBeNaN();
  expect(1).not.toBeNaN();
});

Tests

.toBeFinite()

Use .toBeFinite when checking if a value is a Number, not NaN or Infinity.

test('passes when value is a finite number', () => {
  expect(1).toBeFinite();
  expect(Infinity).not.toBeFinite();
  expect(NaN).not.toBeFinite();
});

Tests

.toBePositive()

Use .toBePositive when checking if a value is a positive Number.

test('passes when value is a positive number', () => {
  expect(1).toBePositive();
  expect(Infinity).not.toBePositive();
  expect(-1).not.toBePositive();
  expect(NaN).not.toBePositive();
});

Tests

.toBeNegative()

Use .toBeNegative when checking if a value is a negative Number.

test('passes when value is a negative number', () => {
  expect(-1).toBeNegative();
  expect(-Infinity).not.toBeNegative();
  expect(1).not.toBeNegative();
  expect(NaN).not.toBeNegative();
});

Tests

.toBeEven()

Use .toBeEven when checking if a value is an even Number.

test('passes when value is an even number', () => {
  expect(2).toBeEven();
  expect(1).not.toBeEven();
  expect(NaN).not.toBeEven();
});

Tests

.toBeOdd()

Use .toBeOdd when checking if a value is an odd Number.

test('passes when value is an odd number', () => {
  expect(1).toBeOdd();
  expect(2).not.toBeOdd();
  expect(NaN).not.toBeOdd();
});

Tests

.toBeWithin(start, end)

Use .toBeWithin when checking if a number is in between the given bounds of: start (inclusive) and end (exclusive).

test('passes when number is within given bounds', () => {
  expect(1).toBeWithin(1, 3);
  expect(2).toBeWithin(1, 3);
  expect(3).not.toBeWithin(1, 3);
});

Tests

.toBeInteger()

Use .toBeInteger when checking if a number is an integer.

test('passes when value is an integer', () => {
  expect(1).toBeInteger();
  expect(1.0).toBeInteger();
  expect(1.1).not.toBeInteger();
});

Tests