⚡
⚡
⚡
⚡
as-pect
Search…
⚡
as-pect
🚀
Getting Started
🔧
CLI Configuration
🏗
AssemblyScript API
🏛
Test Structure
🤷♀️ Expectations
🎭
toBe
🤨
toStrictEqual
🧱
toBlockEqual
👩🏫 toBeTruthy and toBeFalsy
🔢
toBeNaN
🚫
toBeNull
🌌
toBeFinite
⚾
toThrow
➕
toBe(Greater|Less)Than
🕵️♀️ toBeCloseTo
📏
toHaveLength
🎁
toContain
📦
toContainEqual
✍
Custom Assertions
🎟
Types and Tooling
🪓
Logging
👩🔧 RTrace and Memory Leaks
👉👈 Reflection
🧶
Core API
Powered By
GitBook
📏
toHaveLength
Check the length of a value
This comparison verifies the length of a given object. This includes
Array
,
TypedArray
,
ArrayBuffer
, and custom classes that have a
length
property.
class
LengthExample
{
constructor
(
public
length
:
i32
=
0
)
{}
}
const
array
=
new
Array
<
Vec3
>
(
100
);
const
typedarray
=
new
Uint8Array
(
42
);
const
buffer
=
new
ArrayBuffer
(
29
);
const
custom
=
new
LengthExample
(
50
);
// Array<T> has a length
expect
(
array
).
toHaveLength
(
100
);
// TypedArrays have a length
expect
(
typedarray
).
toHaveLength
(
42
);
// ArrayBuffer uses byteLength
expect
(
buffer
).
toHaveLength
(
29
);
// length is defined on LengthExample
expect
(
custom
).
toHaveLength
(
50
);
If this method is used with anything other than a reference type, it will result in a compile time error.
Note:
ArrayBuffer
classes are tested using the
byteLength
property.
This method is safe to use with
jest
, with the exception of using
ArrayBuffer
type references.
Previous
🕵️♀️ toBeCloseTo
Next
toContain
Last modified
2yr ago
Copy link