Assertion.all() method

Asserts that all elements in the array satisfy the specified Filter.

Signature:

all(reason: string, condition: Filter<InferArrayElement<T>>): this;

Parameters

Parameter	Type	Description
reason	string	A reason to add at the end of the message for additional context.
condition	Filter<InferArrayElement<T>>	A callback that returns `true` whenever the condition is met.

Returns:

this

expect(["Bryce", "Bryan"]).to.all('start with "Bry"', it => startsWith(it, "Bry"));
expect([1,3,4,5]).to.not.all('be even', it => it % 2 === 0);

Example message:

Expected '[1,2,3]' to all be even, but there was an element that failed the check

Index: 1
Value: '1'