## JUnit

### Description

This task runs tests from the JUnit testing framework. The latest version of the framework can be found at http://www.junit.org. This task has been tested with JUnit 3.0 up to JUnit 3.8.1; it won't work with versions prior to JUnit 3.0.

Note: This task depends on external libraries not included in the Ant distribution. See Library Dependencies for more information.

Note: You must have `junit.jar` and the class files for the `<junit>` task in the same classpath. You can do one of:

1. Put both `junit.jar` and the optional tasks jar file in `ANT_HOME/lib`.
2. Do not put either in `ANT_HOME/lib`, and instead include their locations in your `CLASSPATH` environment variable.
3. Do neither of the above, and instead, specify their locations using a `<classpath>` element in the build file. See the FAQ for details.

Tests are defined by nested `test` or `batchtest` tags (see nested elements).

### Parameters

Attribute | Description | Required
printsummary | Print one-line statistics for each testcase. Can take the values `on`, `off`, and `withOutAndErr`. `withOutAndErr` is the same as `on` but also includes the output of the test as written to `System.out` and `System.err`. | No; default is `off`.
fork | Run the tests in a separate VM. | No; default is `off`.
haltonerror | Stop the build process if an error occurs during the test run. | No; default is `off`.
errorproperty | The name of a property to set in the event of an error. | No
haltonfailure | Stop the build process if a test fails (errors are considered failures as well). | No; default is `off`.
failureproperty | The name of a property to set in the event of a failure (errors are considered failures as well). | No.
filtertrace | Filter out Junit and Ant stack frames from error and failure stack traces. | No; default is `on`.
timeout | Cancel the individual tests if they don't finish in the given time (measured in milliseconds). Ignored if `fork` is disabled. | No
maxmemory | Maximum amount of memory to allocate to the forked VM. Ignored if `fork` is disabled. | No
jvm | The command used to invoke the Java Virtual Machine, default is 'java'. The command is resolved by `java.lang.Runtime.exec()`. Ignored if `fork` is disabled. | No; default is `java`.
dir | The directory in which to invoke the VM. Ignored if `fork` is disabled. | No
newenvironment | Do not propagate the old environment when new environment variables are specified. Ignored if `fork` is disabled. | No; default is `false`.
includeantruntime | Implicitly add the Ant classes required to run the tests and JUnit to the classpath in forked mode. | No; default is `true`.
showoutput | Send any output generated by tests to Ant's logging system as well as to the formatters. By default only the formatters receive the output. | No

By using the `errorproperty` and `failureproperty` attributes, it is possible to perform setup work (such as starting an external server), execute the test, clean up, and still fail the build in the event of a failure.

The `filtertrace` attribute condenses error and failure stack traces before reporting them. It works with both the plain and XML formatters. It filters out any lines that begin with the following string patterns:

       "junit.framework.TestCase"
       "junit.framework.TestResult"
       "junit.framework.TestSuite"
       "junit.framework.Assert."
       "junit.swingui.TestRunner"
       "junit.awtui.TestRunner"
       "junit.textui.TestRunner"
       "java.lang.reflect.Method.invoke("
       "org.apache.tools.ant."

### Nested Elements

The `<junit>` task supports a nested `<classpath>` element that represents a PATH like structure.

#### jvmarg

If `fork` is enabled, additional parameters may be passed to the new VM via nested `<jvmarg>` elements. For example:

    <junit fork="yes">
      <jvmarg value="-Djava.compiler=NONE"/>
      ...
    </junit>

would run the test in a VM without JIT.

`<jvmarg>` allows all attributes described in Command-line Arguments.

#### sysproperty

Use nested `<sysproperty>` elements to specify system properties required by the class. These properties will be made available to the VM during the execution of the test (either ANT's VM or the forked VM, if `fork` is enabled). The attributes for this element are the same as for environment variables.

    <junit fork="no">
      <sysproperty key="basedir" value="${basedir}"/>
      ...
    </junit>

would run the test in ANT's VM and make the `basedir` property available to the test.

#### env

It is possible to specify environment variables to pass to the forked VM via nested `<env>` elements. For a description of the `<env>` element's attributes, see the description in the exec task.

Settings will be ignored if `fork` is disabled.

#### formatter

The results of the tests can be printed in different formats. Output will always be sent to a file, unless you set the `usefile` attribute to `false`. The name of the file is determined by the name of the test and can be set by the `outfile` attribute of `<test>`.

There are three predefined formatters - one prints the test results in XML format, the other emits plain text. The formatter named `brief` will only print detailed information for testcases that failed, while `plain` gives a little statistics line for all test cases. Custom formatters that need to implement `org.apache.tools.ant.taskdefs.optional.junit.JUnitResultFormatter` can be specified.

If you use the XML formatter, it may not include the same output that your tests have written as some characters are illegal in XML documents and will be dropped.

Attribute | Description | Required
type | Use a predefined formatter (either `xml`, `plain`, or `brief`). | Exactly one of these.
classname | Name of a custom formatter class.
extension | Extension to append to the output filename. | Yes, if `classname` has been used.
usefile | Boolean that determines whether output should be sent to a file. | No; default is `true`.

#### test

Defines a single test class.

Attribute | Description | Required
name | Name of the test class. | Yes
fork | Run the tests in a separate VM. Overrides value set in `<junit>`. | No
haltonerror | Stop the build process if an error occurs during the test run. Overrides value set in `<junit>`. | No
errorproperty | The name of a property to set in the event of an error. Overrides value set in `<junit>`. | No
haltonfailure | Stop the build process if a test fails (errors are considered failures as well). Overrides value set in `<junit>`. | No
failureproperty | The name of a property to set in the event of a failure (errors are considered failures as well). Overrides value set in `<junit>`. | No
filtertrace | Filter out Junit and Ant stack frames from error and failure stack traces. Overrides value set in `<junit>`. | No; default is `on`.
todir | Directory to write the reports to. | No; default is the current directory.
outfile | Base name of the test result. The full filename is determined by this attribute and the extension of `formatter`. | No; default is `TEST-`name, where name is the name of the test specified in the `name` attribute.
if | Only run test if the named property is set. | No
unless | Only run test if the named property is not set. | No

Tests can define their own formatters via nested `<formatter>` elements.

#### batchtest

Define a number of tests based on pattern matching.

`batchtest` collects the included files from any number of nested `<fileset>`s. It then generates a test class name for each file that ends in `.java` or `.class`.

Attribute | Description | Required
fork | Run the tests in a separate VM. Overrides value set in `<junit>`. | No
haltonerror | Stop the build process if an error occurs during the test run. Overrides value set in `<junit>`. | No
errorproperty | The name of a property to set in the event of an error. Overrides value set in `<junit>`. | No
haltonfailure | Stop the build process if a test fails (errors are considered failures as well). Overrides value set in `<junit>`. | No
failureproperty | The name of a property to set in the event of a failure (errors are considered failures as well). Overrides value set in `<junit>` | No
filtertrace | Filter out Junit and Ant stack frames from error and failure stack traces. Overrides value set in `<junit>`. | No; default is `on`.
todir | Directory to write the reports to. | No; default is the current directory.
if | Only run tests if the named property is set. | No
unless | Only run tests if the named property is not set. | No

Batchtests can define their own formatters via nested `<formatter>` elements.

### Examples

    <junit>
      <test name="my.test.TestCase"/>
    </junit>

Runs the test defined in `my.test.TestCase` in the same VM. No output will be generated unless the test fails.

    <junit printsummary="yes" fork="yes" haltonfailure="yes">
      <formatter type="plain"/>
      <test name="my.test.TestCase"/>
    </junit>

Runs the test defined in `my.test.TestCase` in a separate VM. At the end of the test, a one-line summary will be printed. A detailed report of the test can be found in `TEST-my.test.TestCase.txt`. The build process will be stopped if the test fails.

    <junit printsummary="yes" haltonfailure="yes">
      <classpath>
        <pathelement location="${build.tests}"/>
        <pathelement path="${java.class.path}"/>
      </classpath>

      <formatter type="plain"/>

      <test name="my.test.TestCase" haltonfailure="no" outfile="result">
        <formatter type="xml"/>
      </test>

      <batchtest fork="yes" todir="${reports.tests}">
        <fileset dir="${src.tests}">
          <include name="**/*Test*.java"/>
          <exclude name="**/AllTests.java"/>
        </fileset>
      </batchtest>
    </junit>

Runs `my.test.TestCase` in the same VM, ignoring the given CLASSPATH; only a warning is printed if this test fails. In addition to the plain text test results, for this test a XML result will be output to `result.xml`. Then, for each matching file in the directory defined for `${src.tests}` a test is run in a separate VM. If a test fails, the build process is aborted. Results are collected in files named `TEST-`name`.txt` and written to `${reports.tests}`.

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