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<!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 print output to the console?</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_output {testthat}"><tr><td>expect_output {testthat}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Does code print output to the console?</h2> <h3>Description</h3> <p>Test for output produced by <code>print()</code> or <code>cat()</code>. This is best used for very simple output; for more complex cases use <code><a href="expect_snapshot.html">expect_snapshot()</a></code>. </p> <h3>Usage</h3> <pre> expect_output( object, regexp = NULL, ..., info = NULL, label = NULL, width = 80 ) </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>regexp</code></td> <td> <p>Regular expression to test against. </p> <ul> <li><p> A character vector giving a regular expression that must match the output. </p> </li> <li><p> If <code>NULL</code>, the default, asserts that there should output, but doesn't check for a specific value. </p> </li> <li><p> If <code>NA</code>, asserts that there should be no output. </p> </li></ul> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>Arguments passed on to <code><a href="expect_match.html">expect_match</a></code> </p> <dl> <dt><code>all</code></dt><dd><p>Should all elements of actual value match <code>regexp</code> (TRUE), or does only one need to match (FALSE).</p> </dd> <dt><code>fixed</code></dt><dd><p>If <code>TRUE</code>, treats <code>regexp</code> as a string to be matched exactly (not a regular expressions). Overrides <code>perl</code>.</p> </dd> <dt><code>perl</code></dt><dd><p>logical. Should Perl-compatible regexps be used?</p> </dd> </dl> </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> <tr valign="top"><td><code>width</code></td> <td> <p>Number of characters per line of output. This does not inherit from <code>getOption("width")</code> so that tests always use the same output width, minimising spurious differences.</p> </td></tr> </table> <h3>Value</h3> <p>The first argument, invisibly. </p> <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_null.html">expect_null</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> str(mtcars) expect_output(str(mtcars), "32 obs") expect_output(str(mtcars), "11 variables") # You can use the arguments of grepl to control the matching expect_output(str(mtcars), "11 VARIABLES", ignore.case = TRUE) expect_output(str(mtcars), "$ mpg", fixed = TRUE) </pre> <hr /><div style="text-align: center;">[Package <em>testthat</em> version 3.1.5 <a href="00Index.html">Index</a>]</div> </body></html>