Documentation / @zerotal/testing / index / FakeDisk

Class: FakeDisk

Defined in: core/src/storage/FakeDisk.ts:32

An in-memory storage disk for tests.

Writing real files to test an upload leaves the suite dependent on a filesystem it has to clean up — and a test that forgets to passes the second time for the wrong reason. This keeps everything in a Map, so each test starts empty by construction, and adds the assertions that a plain driver has no reason to carry.

Install it with Storage.fake(), which swaps it in for a named disk and returns it.

Example

const disk = Storage.fake();

await app.multipart('/avatar', { avatar: fakeFile.image('me.png') });

disk.assertExists('avatars/me.png');
disk.assertCount(1);

Implements

StorageDriver

Constructors

Constructor

new FakeDisk(baseUrl?): FakeDisk

Defined in: core/src/storage/FakeDisk.ts:39

Parameters

baseUrl?

string = "/storage"

Prefix returned by url, so a test can assert on the URL a controller hands back.

Returns

FakeDisk

Accessors

count

Get Signature

get count(): number

Defined in: core/src/storage/FakeDisk.ts:133

Number of files currently stored.

Returns

number

Methods

put()

put(path, content, options?): Promise<void>

Defined in: core/src/storage/FakeDisk.ts:43

Parameters

path

string

content

string | Blob | Uint8Array<ArrayBufferLike>

options?

PutOptions = {}

Returns

Promise<void>

Implementation of

StorageDriver.put

append()

append(path, content): Promise<void>

Defined in: core/src/storage/FakeDisk.ts:57

Append to the end of a file, creating it when absent.

Only a filesystem can do this. An object store rewrites the whole object on every write, so emulating an append there would quietly turn one line of a log into a full download-and-upload of the day's file — S3Driver throws UnsupportedOperationError rather than pretend. Use it for things that are genuinely local and line-oriented, like the log trail.

Parameters

path

string

content

string | Uint8Array<ArrayBufferLike>

Returns

Promise<void>

Implementation of

StorageDriver.append

get()

get(path): Promise<string | null>

Defined in: core/src/storage/FakeDisk.ts:66

Parameters

path

string

Returns

Promise<string | null>

Implementation of

StorageDriver.get

stream()

stream(path): Promise<Blob | null>

Defined in: core/src/storage/FakeDisk.ts:71

A lazy handle for path, or null when absent.

Optional. When a backend can hand back something streamable, serving a file does not have to read it into memory first — which is the difference between serving a 2 GB video and falling over. StorageFilesMiddleware uses it when present and falls back to getBuffer when not.

Parameters

path

string

Returns

Promise<Blob | null>

Implementation of

StorageDriver.stream

getBuffer()

getBuffer(path): Promise<Uint8Array<ArrayBufferLike> | null>

Defined in: core/src/storage/FakeDisk.ts:76

Parameters

path

string

Returns

Promise<Uint8Array<ArrayBufferLike> | null>

Implementation of

StorageDriver.getBuffer

exists()

exists(path): Promise<boolean>

Defined in: core/src/storage/FakeDisk.ts:80

Parameters

path

string

Returns

Promise<boolean>

Implementation of

StorageDriver.exists

delete()

delete(path): Promise<void>

Defined in: core/src/storage/FakeDisk.ts:84

Parameters

path

string

Returns

Promise<void>

Implementation of

StorageDriver.delete

url()

url(path): string

Defined in: core/src/storage/FakeDisk.ts:88

Return a public URL for the given path.

Parameters

path

string

Returns

string

Implementation of

StorageDriver.url

copy()

copy(source, destination): Promise<void>

Defined in: core/src/storage/FakeDisk.ts:92

Copy a file within the same disk.

Parameters

source

string

destination

string

Returns

Promise<void>

Implementation of

StorageDriver.copy

move()

move(source, destination): Promise<void>

Defined in: core/src/storage/FakeDisk.ts:102

Move (rename) a file within the same disk.

Parameters

source

string

destination

string

Returns

Promise<void>

Implementation of

StorageDriver.move

size()

size(path): Promise<number | null>

Defined in: core/src/storage/FakeDisk.ts:107

Return the file size in bytes, or null if not found.

Parameters

path

string

Returns

Promise<number | null>

Implementation of

StorageDriver.size

lastModified()

lastModified(path): Promise<number | null>

Defined in: core/src/storage/FakeDisk.ts:111

Return the last-modified timestamp (ms since epoch), or null if not found.

Parameters

path

string

Returns

Promise<number | null>

Implementation of

StorageDriver.lastModified

temporaryUrl()

temporaryUrl(path, expiresInSeconds): Promise<string>

Defined in: core/src/storage/FakeDisk.ts:115

Return a temporary URL valid for expiresInSeconds seconds. For local driver this is a signed token URL; for S3 it is a presigned URL.

Parameters

path

string

expiresInSeconds

number

Returns

Promise<string>

Implementation of

StorageDriver.temporaryUrl

paths()

paths(): string[]

Defined in: core/src/storage/FakeDisk.ts:123

Every stored path, in insertion order.

Returns

string[]

file()

file(path): FakeStoredFile | undefined

Defined in: core/src/storage/FakeDisk.ts:128

The full record for a stored file, or undefined.

Parameters

path

string

Returns

FakeStoredFile | undefined

clear()

clear(): void

Defined in: core/src/storage/FakeDisk.ts:138

Forget everything stored so far.

Returns

void

assertExists()

assertExists(path, contents?): this

Defined in: core/src/storage/FakeDisk.ts:145

Assert a file exists at path, optionally matching its exact contents.

Parameters

path

string

contents?

string | Uint8Array<ArrayBufferLike>

Returns

this

assertMissing()

assertMissing(path): this

Defined in: core/src/storage/FakeDisk.ts:167

Assert nothing is stored at path.

Parameters

path

string

Returns

this

assertExistsMatching()

assertExistsMatching(pattern): this

Defined in: core/src/storage/FakeDisk.ts:181

Assert a file exists whose path matches pattern — the way to assert on an upload stored under a generated name.

Parameters

pattern

RegExp

Returns

this

Example

disk.assertExistsMatching(/^avatars/[0-9a-f-]+\.png$/);

assertContentType()

assertContentType(path, contentType): this

Defined in: core/src/storage/FakeDisk.ts:191

Assert the file at path was stored with the given content type.

Parameters

path

string

contentType

string

Returns

this

assertCount()

assertCount(expected): this

Defined in: core/src/storage/FakeDisk.ts:204

Assert exactly expected files are stored.

Parameters

expected

number

Returns

this

assertNothingStored()

assertNothingStored(): this

Defined in: core/src/storage/FakeDisk.ts:214

Assert nothing at all was stored.

Returns

this