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<p>Code coverage <table class="wysiwyg-macro" data-macro-name="excerpt" data-macro-parameters="atlassian-macro-output-type=INLINE" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2V4Y2VycHQ6YXRsYXNzaWFuLW1hY3JvLW91dHB1dC10eXBlPUlOTElORX0&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="RICH_TEXT"><tr><td class="wysiwyg-macro-body"><p>is a useful measure of the effectiveness of unit tests and can be derived for Groovy tests</p></td></tr></table>.</p>

<p>Consider the following Groovy code:</p>
<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
class BiggestPairCalc
{
    int sumBiggestPair(int a, int b, int c) {
        def op1 = a
        def op2 = b
        if (c > a) {
            op1 = c
        } else if (c > b) {
            op2 = c
        }
        return op1 + op2
    }
}
</pre></td></tr></table>
<p>And the following test:</p>
<table class="wysiwyg-macro" data-macro-name="code" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
class BiggestPairCalcTest extends GroovyTestCase
{
    void testSumBiggestPair() {
        def calc = new BiggestPairCalc()
        assertEquals(9, calc.sumBiggestPair(5, 4, 1))
    }
}
</pre></td></tr></table>
<p>If you use <a href="http://cobertura.sourceforge.net/">Cobertura</a> to perform your coverage, the resulting report might look like:</p>

<p><img class="confluence-embedded-image" src="/download/attachments/231080163/cobertura.jpg?version=1&amp;modificationDate=1369412707526" data-image-src="/download/attachments/231080163/cobertura.jpg?version=1&amp;modificationDate=1369412707526" data-linked-resource-id="231375763" data-linked-resource-type="attachment" data-linked-resource-default-alias="cobertura.jpg" data-base-url="http://docs.codehaus.org" data-linked-resource-container-id="231080163" title="null > cobertura.jpg"></p>

<p>Your <a href="http://ant.apache.org">Ant</a> build file to make all this happen might look like:</p>
<table class="wysiwyg-macro" data-macro-name="code" data-macro-default-parameter="xml" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2NvZGU6eG1sfQ&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
&lt;?xml version="1.0"?>
&lt;project name="sample" default="coverage-report" basedir=".">
  &lt;!-- set up properties, paths, taskdefs, prepare targets -->
  [details deleted]

&lt;!-- compile java (if you have any) and groovy source -->
  &lt;target name="compile" depends="prepare">
    &lt;javac srcdir="${dir.src}" destdir="${dir.build}" debug="true">
      &lt;classpath refid="project.classpath"/>
    &lt;/javac>
    &lt;groovyc srcdir="${dir.src}" destdir="${dir.build}" stacktrace="true">
      &lt;classpath refid="project.classpath"/>
    &lt;/groovyc>
  &lt;/target>

&lt;!-- instrument already compiled class files -->
  &lt;target name="instrument" depends="compile" >
    &lt;cobertura-instrument todir="target/instrumented-classes">
      &lt;fileset dir="${dir.build}">
          &lt;include name="**/*.class"/>
      &lt;/fileset>
    &lt;/cobertura-instrument>
  &lt;/target>

&lt;!-- run all junit tests using the instrumented classes -->
  &lt;target name="cover-test" depends="instrument">
    &lt;mkdir dir="${dir.report}/cobertura" />
    &lt;junit printsummary="yes" haltonerror="no" haltonfailure="no" fork="yes">
      &lt;formatter type="plain" usefile="false"/>
      &lt;batchtest>
        &lt;fileset dir="target/instrumented-classes" includes="**/*Test.class" />
      &lt;/batchtest>
      &lt;classpath refid="cover-test.classpath"/>
    &lt;/junit>
  &lt;/target>

&lt;!-- create the html reports -->
  &lt;target name="coverage-report" depends="cover-test">
    &lt;cobertura-report srcdir="${dir.src}" destdir="${dir.report}/cobertura"/>
  &lt;/target>
&lt;/project>
</pre></td></tr></table>
<p>For more details, see <a href="http://groovy.canoo.com/gina">GINA</a> or the <a href="http://cobertura.sourceforge.net/">Cobertura</a> web site or <a class="confluence-link" href="/display/GROOVY/Code+Coverage+with+Cobertura" data-linked-resource-id="49930" data-linked-resource-type="page" data-linked-resource-default-alias="Code Coverage with Cobertura" data-base-url="http://docs.codehaus.org">Code Coverage with Cobertura</a>.</p>