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fluent-asserts

instanceOf

.instanceOf()

Asserts that the tested value is related to a type.

Asserts that a value is an instance of a specific type or inherits from it.

Examples

With Negation

expect(value).to.be.instanceOf!Object;
expect(value).to.not.be.instanceOf!string;
expect(value).to.be.instanceOf!Exception;
expect(value).to.be.instanceOf!Object;
expect(value).to.not.be.instanceOf!string;

Modifiers

This assertion supports the following modifiers:

  • .not - Negates the assertion
  • .to - Language chain (no effect)
  • .be - Language chain (no effect)