CODEWITHSUNDEEP
unit-testingdeno
hkong
hkong

Reputation: 9072

In Deno's assertRejects(), where are standard exception types found to test for specific exceptions

In the following Deno test snippet:

    await assertRejects(
      async (): Promise<void> => {
        for await (const entry of walk('./non-existent-directory')) {
          console.log(entry)
        }
      },
      NotFound,
      'No such file or directory'
    )

Deno spells out the type and message to the console NotFound: No such file or directory (os error 2)

but where is that NotFound exception declared? When I run the snipped as is using Deno's standard testing library , I get error: TS2304 [ERROR]: Cannot find name 'NotFound'.

Upvotes: 2

Views: 336

Answers (1)

Marcos Casagrande
Marcos Casagrande

Reputation: 40414

Deno specific errors can be accessed through Deno.errors.

For NotFound you should use:

await assertThrowsAsync(
  async (): Promise<void> => {
    for await (const entry of walk('./non-existent-directory')) {
      console.log(entry)
    }
  },
  Deno.errors.NotFound,
  'No such file or directory'
)

Here's the full list:

Deno.errors.AddrInUse
Deno.errors.AddrNotAvailable
Deno.errors.AlreadyExists
Deno.errors.BadResource
Deno.errors.BrokenPipe
Deno.errors.Busy
Deno.errors.ConnectionAborted
Deno.errors.ConnectionRefused
Deno.errors.ConnectionReset
Deno.errors.FilesystemLoop
Deno.errors.Http
Deno.errors.Interrupted
Deno.errors.InvalidData
Deno.errors.IsADirectory
Deno.errors.NetworkUnreachable
Deno.errors.NotADirectory
Deno.errors.NotConnected
Deno.errors.NotFound
Deno.errors.NotSupported
Deno.errors.PermissionDenied
Deno.errors.TimedOut
Deno.errors.UnexpectedEof
Deno.errors.WouldBlock
Deno.errors.WriteZero

Upvotes: 2

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