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Edit File: expect_null.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Does code return 'NULL'?</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for expect_null {testthat}"><tr><td>expect_null {testthat}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Does code return <code>NULL</code>?</h2> <h3>Description</h3> <p>This is a special case because <code>NULL</code> is a singleton so it's possible check for it either with <code>expect_equal(x, NULL)</code> or <code>expect_type(x, "NULL")</code>. </p> <h3>Usage</h3> <pre> expect_null(object, info = NULL, label = NULL) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>object</code></td> <td> <p>Object to test. </p> <p>Supports limited unquoting to make it easier to generate readable failures within a function or for loop. See <a href="quasi_label.html">quasi_label</a> for more details.</p> </td></tr> <tr valign="top"><td><code>info</code></td> <td> <p>Extra information to be included in the message. This argument is soft-deprecated and should not be used in new code. Instead see alternatives in <a href="quasi_label.html">quasi_label</a>.</p> </td></tr> <tr valign="top"><td><code>label</code></td> <td> <p>Used to customise failure messages. For expert use only.</p> </td></tr> </table> <h3>See Also</h3> <p>Other expectations: <code><a href="comparison-expectations.html">comparison-expectations</a></code>, <code><a href="equality-expectations.html">equality-expectations</a></code>, <code><a href="expect_error.html">expect_error</a>()</code>, <code><a href="expect_length.html">expect_length</a>()</code>, <code><a href="expect_match.html">expect_match</a>()</code>, <code><a href="expect_named.html">expect_named</a>()</code>, <code><a href="expect_output.html">expect_output</a>()</code>, <code><a href="expect_reference.html">expect_reference</a>()</code>, <code><a href="expect_silent.html">expect_silent</a>()</code>, <code><a href="inheritance-expectations.html">inheritance-expectations</a></code>, <code><a href="logical-expectations.html">logical-expectations</a></code> </p> <h3>Examples</h3> <pre> x <- NULL y <- 10 expect_null(x) show_failure(expect_null(y)) </pre> <hr /><div style="text-align: center;">[Package <em>testthat</em> version 3.1.5 <a href="00Index.html">Index</a>]</div> </body></html>