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<h1 class="page-header">Converting your TestNG assertions to AssertJ</h1>
<p>This page will help you converting your existing TestNG assertions to AssertJ ones. Note that both types of assertions can coexist, you don't have to migrate all at once.</p>
<p>The idea here is to convert code like :<pre><code class="java">assertEquals(expected, actual);</code></pre> to :</p><p><pre><code class="java">assertThat(actual).isEqualTo(expected);</code></pre> </p>
<p>There are several ways to perform the conversion :</p>
<ul>
<li><a href="#automatic-conversion">automatically</a> with a shell script.</span></li>
<li><a href="#manual-conversion">manually</a> using the regexps described in this page.</li>
<li>With IntelliJ IDEA, using the Structured Search and Replace (SSR) feature.</li>
</ul>
<h3 class="page-header"><span id="automatic-conversion"></span>Automatically converting your TestNG assertions to AssertJ</h3>
<p>It is simple : use the following script (unix and windows only, osx to be done) : <a href="https://github.com/joel-costigliola/assertj-core/blob/master/src/main/scripts/convert-testng-assertions-to-assertj.sh">convert-testng-assertions-to-assertj.sh</a></span></p>
<p>The script is based on <span class="small-code">sed</span> stream editor and regexps. It looks recursively at all <span class="small-code">*Test.java</span> files and performs search and replace to convert TestNG assertions to AssertJ ones (if <span class="small-code">*Test.java</span> file pattern does not suit you, just change it according to your needs in the script).</p>
<p>Usage : execute the script in the base directory containing the test files</p>
<pre><code class="bash"># in the directory containing the test files
convert-testng-assertions-to-assertj.sh</code></pre>
<p>It is not perfect (multiline assertions are not converted) but should do most of the job. After executing it, you will need to : </p>
<ul>
<li>optimize imports with your IDE to remove unused imports.</span></li>
<li>if you were using <span class="small-code">assertEquals</span> with a delta to compare numbers, you will need to statically import <span class="small-code">org.assertj.core.api.Assertions.offset</span> which is how you express deltas in AssertJ (see <a href="https://github.com/joel-costigliola/assertj-examples/blob/master/assertions-examples/src/test/java/org/assertj/examples/NumberAssertionsExamples.java">number_assertions_with_offset_examples()</a> test at the end of NumberAssertionsExamples).</li>
</ul>
<p>The script handles the cases where you use an assertion description, for example :<pre><code class="java">assertEquals("test context", "a", "a");</code></pre> will be replaced by :</p><p><pre><code class="java">assertThat("a").as("test context").isEqualTo("a");</code></pre> </p>
<p>See below the output of the script execution :</p>
<pre><code class="diff" style="font-size:83%;">Converting TestNG assertions to AssertJ assertions on files matching pattern : *Test.java
1 - Replacing : assertEquals(0, myList.size()) ................. by : assertThat(myList).isEmpty()
2 - Replacing : assertEquals(expectedSize, myList.size()) ...... by : assertThat(myList).hasSize(expectedSize)
3 - Replacing : assertEquals(expectedDouble, actual, delta) .... by : assertThat(actual).isEqualTo(expectedDouble, offset(delta))
4 - Replacing : assertEquals(expected, actual) ................. by : assertThat(actual).isEqualTo(expected)
5 - Replacing : assertArrayEquals(expectedArray, actual) ....... by : assertThat(actual).isEqualTo(expectedArray)
6 - Replacing : assertNull(actual) ............................. by : assertThat(actual).isNull()
7 - Replacing : assertNotNull(actual) .......................... by : assertThat(actual).isNotNull()
8 - Replacing : assertTrue(logicalCondition) ................... by : assertThat(logicalCondition).isTrue()
9 - Replacing : assertFalse(logicalCondition) .................. by : assertThat(logicalCondition).isFalse()
10 - Replacing : assertSame(expected, actual) ................... by : assertThat(actual).isSameAs(expected)
11 - Replacing : assertNotSame(expected, actual) ................ by : assertThat(actual).isNotSameAs(expected)
12 - Replacing TestNG static import by AssertJ ones, at this point you will probably need to :
12 --- optimize imports with your IDE to remove unused imports
12 --- add "import static org.assertj.core.api.Assertions.offset;" if you were using TestNG number assertions with delta</code></pre>
<p>On windows you might have permission problems as sed creates temp files. If you get this error, you have to grant write permissions to the current user for the folder where your test files live.</p>
<pre><code class="diff" style="font-size:83%;">Converting TestNG assertions to AssertJ assertions on files matching pattern : *Test.java
1 - Replacing : assertEquals(0, myList.size()) ................. by : assertThat(myList).isEmpty()
sed: preserving permissions for `./sed005904': Permission denied
sed: preserving permissions for `./sed004220': Permission denied</code></pre>
<h3 class="page-header"><span id="manual-conversion"></span>Converting your TestNG assertions to AssertJ with regexp</h3>
<p>Here's a list of find/replace expressions that allow to change TestNG assertions into AssertJ assertions (don't forget to check regexp mode in your editor replace window).</p>
<p>The order of find/replace is important, so that you can benefit from the most relevant AssertJ assertions. For example you should convert <span class="small-code">assertEquals(0, myList.size())</span> to <span class="small-code">assertThat(myList).isEmpty()</span> instead of
<span class="small-code">assertThat(myList.size()).isEqualTo(0)</span>
</p>
<h5 class="page-header">1 - Converting <span class="small-code">assertEquals(0, myList.size())</span> to <span class="small-code">assertThat(myList).isEmpty()</span></h5>
<p>Find/replace Regexp :</p>
<pre><code class="java">assertEquals(0,(.*).size()); -> assertThat(\1).isEmpty();</code></pre>
<p>It's important to run this one before the <span class="small-code">assertEquals</span> -> <span class="small-code">isEqualTo</span> conversion to avoid ending with : <span class="small-code">assertThat(myList.size()).isEqualTo(0)</span></p>
<h5 class="page-header">2 - Converting <span class="small-code">assertEquals(expectedSize, myList.size())</span> to <span class="small-code">assertThat(myList).hasSize(expectedSize)</h5>
<p>Find/replace Regexp :</p>
<pre><code class="java">assertEquals((.*),(*.).size()); -> assertThat(\2).hasSize(\1);</code></pre>
<p>It's important to run this one before the <span class="small-code">assertEquals</span> -> <span class="small-code">isEqualTo</span> conversion to avoid ending with : <span class="small-code">assertThat(myList.size()).isEqualTo(expectedSize)</span></p>
<h5 class="page-header">3 - Converting <span class="small-code">assertEquals(value, valueUnderTest)</span> to <span class="small-code">assertThat(valueUnderTest).isEqualTo(value)</h5>
<p>Find/replace Regexp :</p>
<pre><code class="java">assertEquals((.*),(.*)); -> assertThat(\2).isEqualTo(\1);</code></pre>
<h5 class="page-header">4 - Converting <span class="small-code">assertNull(objectUnderTest)</span> to <span class="small-code">assertThat(objectUnderTest).isNull()</h5>
<p>Find/replace Regexp :</p><pre><code class="java">assertNull((.*)); -> assertThat(\1).isNull();</code></pre>
<h5 class="page-header">5 - Converting <span class="small-code">assertNotNull(objectUnderTest)</span> to <span class="small-code">assertThat(objectUnderTest).isNotNull()</h5>
<p>Find/replace Regexp :</p>
<pre><code class="java">assertNotNull((.*)); -> assertThat(\1).isNotNull();</code></pre>
<h5 class="page-header">6 - Converting <span class="small-code">assertTrue(logicalCondition)</span> to <span class="small-code">assertThat(logicalCondition).isTrue()</h5>
<p>Find/replace Regexp :</p>
<pre><code class="java">assertTrue((.*)); -> assertThat(\1).isTrue();</code></pre>
<h5 class="page-header">7 - Converting <span class="small-code">assertFalse(logicalCondition)</span> to <span class="small-code">assertThat(logicalCondition).isFalse()</h5>
<p>Find/replace Regexp :</p>
<pre><code class="java">assertFalse((.*)); -> assertThat(\1).isFalse();</code></pre>
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