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<div class="subTitle">org.junit.runners</div>
<h2 title="Class Parameterized" class="title">Class Parameterized</h2>
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<li>org.junit.runners.Parameterized</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../org/junit/runner/Describable.html" title="interface in org.junit.runner">Describable</a>, <a href="../../../org/junit/runner/manipulation/Filterable.html" title="interface in org.junit.runner.manipulation">Filterable</a>, <a href="../../../org/junit/runner/manipulation/Sortable.html" title="interface in org.junit.runner.manipulation">Sortable</a></dd>
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<pre>public class <span class="strong">Parameterized</span>
extends <a href="../../../org/junit/runners/Suite.html" title="class in org.junit.runners">Suite</a></pre>
<div class="block"><p>
The custom runner <code>Parameterized</code> implements parameterized tests.
When running a parameterized test class, instances are created for the
cross-product of the test methods and the test data elements.
</p>
For example, to test a Fibonacci function, write:
<pre>
@RunWith(Parameterized.class)
public class FibonacciTest {
@Parameters(name= "{index}: fib({0})={1}")
public static Iterable<Object[]> data() {
return Arrays.asList(new Object[][] { { 0, 0 }, { 1, 1 }, { 2, 1 },
{ 3, 2 }, { 4, 3 }, { 5, 5 }, { 6, 8 } });
}
private int fInput;
private int fExpected;
public FibonacciTest(int input, int expected) {
fInput= input;
fExpected= expected;
}
@Test
public void test() {
assertEquals(fExpected, Fibonacci.compute(fInput));
}
}
</pre>
<p>
Each instance of <code>FibonacciTest</code> will be constructed using the
two-argument constructor and the data values in the
<code>@Parameters</code> method.
<p>
In order that you can easily identify the individual tests, you may provide a
name for the <code>@Parameters</code> annotation. This name is allowed
to contain placeholders, which are replaced at runtime. The placeholders are
<dl>
<dt>{index}</dt>
<dd>the current parameter index</dd>
<dt>{0}</dt>
<dd>the first parameter value</dd>
<dt>{1}</dt>
<dd>the second parameter value</dd>
<dt>...</dt>
<dd></dd>
</dl>
In the example given above, the <code>Parameterized</code> runner creates
names like <code>[1: fib(3)=2]</code>. If you don't use the name parameter,
then the current parameter index is used as name.
</p>
You can also write:
<pre>
@RunWith(Parameterized.class)
public class FibonacciTest {
@Parameters
public static Iterable<Object[]> data() {
return Arrays.asList(new Object[][] { { 0, 0 }, { 1, 1 }, { 2, 1 },
{ 3, 2 }, { 4, 3 }, { 5, 5 }, { 6, 8 } });
}
@Parameter(0)
public int fInput;
@Parameter(1)
public int fExpected;
@Test
public void test() {
assertEquals(fExpected, Fibonacci.compute(fInput));
}
}
</pre>
<p>
Each instance of <code>FibonacciTest</code> will be constructed with the default constructor
and fields annotated by <code>@Parameter</code> will be initialized
with the data values in the <code>@Parameters</code> method.
</p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>4.0</dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<td class="colFirst"><code>static interface </code></td>
<td class="colLast"><code><strong><a href="../../../org/junit/runners/Parameterized.Parameter.html" title="annotation in org.junit.runners">Parameterized.Parameter</a></strong></code>
<div class="block">Annotation for fields of the test class which will be initialized by the
method annotated by <code>Parameters</code><br/>
By using directly this annotation, the test class constructor isn't needed.<br/>
Index range must start at 0.</div>
</td>
</tr>
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<td class="colFirst"><code>static interface </code></td>
<td class="colLast"><code><strong><a href="../../../org/junit/runners/Parameterized.Parameters.html" title="annotation in org.junit.runners">Parameterized.Parameters</a></strong></code>
<div class="block">Annotation for a method which provides parameters to be injected into the
test class constructor by <code>Parameterized</code></div>
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<td class="colOne"><code><strong><a href="../../../org/junit/runners/Parameterized.html#Parameterized(java.lang.Class)">Parameterized</a></strong>(<a href="/usr/share/doc/default-jre/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> klass)</code>
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<td class="colFirst"><code>protected <a href="/usr/share/doc/default-jre/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/junit/runner/Runner.html" title="class in org.junit.runner">Runner</a>></code></td>
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<div class="block">Returns a list of objects that define the children of this Runner.</div>
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<h4>Parameterized</h4>
<pre>public Parameterized(<a href="/usr/share/doc/default-jre/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?> klass)
throws <a href="/usr/share/doc/default-jre/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></pre>
<div class="block">Only called reflectively. Do not use programmatically.</div>
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<dd><code><a href="/usr/share/doc/default-jre/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code></dd></dl>
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<pre>protected <a href="/usr/share/doc/default-jre/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/junit/runner/Runner.html" title="class in org.junit.runner">Runner</a>> getChildren()</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../org/junit/runners/ParentRunner.html#getChildren()">ParentRunner</a></code></strong></div>
<div class="block">Returns a list of objects that define the children of this Runner.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../org/junit/runners/Suite.html#getChildren()">getChildren</a></code> in class <code><a href="../../../org/junit/runners/Suite.html" title="class in org.junit.runners">Suite</a></code></dd>
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