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testing.assertEmpty() function

content/flux/v0/stdlib/testing/assertempty.md

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<!------------------------------------------------------------------------------ IMPORTANT: This page was generated from comments in the Flux source code. Any edits made directly to this page will be overwritten the next time the documentation is generated. To make updates to this documentation, update the function comments above the function definition in the Flux source code: https://github.com/influxdata/flux/blob/master/stdlib/testing/testing.flux#L92-L92 Contributing to Flux: https://github.com/influxdata/flux#contributing Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md ------------------------------------------------------------------------------->

testing.assertEmpty() tests if an input stream is empty. If not empty, the function returns an error.

assertEmpty can be used to perform in-line tests in a query.

Function type signature
js
(<-tables: stream[A]) => stream[A]

{{% caption %}} For more information, see Function type signatures. {{% /caption %}}

Parameters

tables

Input data. Default is piped-forward data (<-).

Examples

Check if there is a difference between streams

This example uses testing.diff() to output the difference between two streams of tables. testing.assertEmpty() checks to see if the difference is empty.

js
import "sampledata"
import "testing"

want = sampledata.int()
got = sampledata.float() |> toInt()

got
    |> testing.diff(want: want)
    |> testing.assertEmpty()