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Number

Describes the possible expectations for numbers.

Equality​

You can verify, that the number is equal to another one or not:

int subject = 42;

await Expect.That(subject).IsEqualTo(42);

You can also specify a tolerance:

double subject = 42.1;

await Expect.That(subject).IsEqualTo(42).Within(0.2)
  .Because("we accept values between 41.8 and 42.2 (42 ± 0.2)");

One of​

You can verify, that the number is one of many alternatives:

int subject = 42;

await Expect.That(subject).IsOneOf(40, 42, 44);

You can also specify a tolerance:

double subject = 42.1;

await Expect.That(subject).IsOneOf(40, 42, 44).Within(0.2)
  .Because("we accept values between 39.8 and 40.2 or 41.8 and 42.2 or 43.8 and 44.2");

Greater than​

You can verify, that the number is greater than (or equal to) another number:

int subject = 42;

await Expect.That(subject).IsGreaterThan(41);
await Expect.That(subject).IsGreaterThanOrEqualTo(42);

You can also specify a tolerance:

double subject = 41.9;

await Expect.That(subject).IsGreaterThan(42).Within(0.2)
  .Because("we accept values greater than 41.8 (42 ± 0.2)");

Less than​

You can verify, that the number is less than (or equal to) another number:

int subject = 42;

await Expect.That(subject).IsLessThanOrEqualTo(42);
await Expect.That(subject).IsLessThan(43);

You can also specify a tolerance:

double subject = 42.1;

await Expect.That(subject).IsLessThan(42).Within(0.2)
  .Because("we accept values less than 42.2 (42 ± 0.2)");

Positive / negative​

You can verify, that the number is positive or negative:

await Expect.That(42).IsPositive();
await Expect.That(-3).IsNegative();

Note: these expectations are only available for signed numbers.

NaN​

For floating point numbers you can verify, that the number is NaN or not:

await Expect.That(float.NaN).IsNaN();
await Expect.That(42.0).IsNotNaN();

Infinity​

For floating point numbers you can verify, that the number is finite or infinite:

await Expect.That(float.PositiveInfinity).IsInfinite();
await Expect.That(42.0).IsFinite();