I have already gone through this solution : Struts 2 JUnit Plugin v2.2.3: Test Class Extending StrutsTestCase; 'request' is null
But I'm already not having struts2-spring plugin, and neither I'm using spring in my application.
I have 3 test-cases, 2 fails at request being null and one fails at session being null
First Stacktrace
java.lang.NullPointerException
at org.apache.struts2.interceptor.MessageStoreInterceptor.before(MessageStoreInterceptor.java:228)
at org.apache.struts2.interceptor.MessageStoreInterceptor.intercept(MessageStoreInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at actions.TestIoOptimizationAction.login(TestIoOptimizationAction.java:29)
corresponds to
Collection actionErrors = (Collection) session.get(actionErrorsSessionKey);
Second & Third test stacktrace
java.lang.NullPointerException
at org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
at org.apache.struts2.StrutsJUnit4TestCase.getActionProxy(StrutsJUnit4TestCase.java:149)
corresponds to
String contextPath = ServletActionContext.getRequest().getContextPath();
I believe there is some dependency issues. I've tried removing a few dependencies one-by-one and in-combination, but neither worked.
Here's how my POM looks like :
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.paypal.sdk</groupId>
<artifactId>rest-api-sdk</artifactId>
<version>0.7.1</version>
</dependency>
<dependency>
<groupId>net.sourceforge.htmlunit</groupId>
<artifactId>htmlunit</artifactId>
<version>2.12</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.0</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils-core</artifactId>
<version>1.8.3</version>
</dependency>
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.5</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.0.0.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-servlet</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>org.apache.tiles</groupId>
<artifactId>tiles-jsp</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>${struts.version}</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-json-plugin</artifactId>
<version>${struts.version}</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-tiles-plugin</artifactId>
<version>${struts.version}</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-junit-plugin</artifactId>
<version>${struts.version}</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.1</version>
</dependency>
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>1.7.3</version>
</dependency>
<!-- <dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>-->
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-6.0</artifactId>
<version>1.0.0.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.myfaces.core</groupId>
<artifactId>myfaces-api</artifactId>
<version>2.1.11</version>
</dependency>
<dependency>
<groupId>net.sf.jasperreports</groupId>
<artifactId>jasperreports</artifactId>
<version>3.7.5</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>xml-apis</groupId>
<artifactId>xml-apis</artifactId>
<version>1.4.01</version>
</dependency>
</dependencies>
<properties>
<struts.version>2.3.12</struts.version>
<hibernate.version>3.6.10.Final</hibernate.version>
<struts.jquery.version>3.5.1</struts.jquery.version>
<netbeans.compile.on.save>all</netbeans.compile.on.save>
<netbeans.hint.deploy.server>Tomcat</netbeans.hint.deploy.server>
</properties>
Update - The tests looks like
@Test
public void login() throws Exception {
request.setParameter("email", "nitin.cool4urchat@gmail.com");
request.setParameter("password", "22");
ActionProxy proxy = getActionProxy("login");
String result = proxy.execute();
assertEquals("success", result);
System.out.println(response.getContentAsString());
}
@Test
public void testView() throws Exception {
ActionProxy proxy = getActionProxy("/optimize/view");
String result = proxy.execute();
assertEquals("success", result);
System.out.println(response.getContentAsString());
proxy = getActionProxy("/optimize/view/23");
result = proxy.execute();
assertEquals("success", result);
System.out.println(response.getContentAsString());
proxy = getActionProxy("/optimize/view/110");
result = proxy.execute();
assertEquals("success", result);
System.out.println(response.getContentAsString());
}
@Test
public void testSave() throws Exception {
request.setContent("{\"id\":\"1\",\"name\":\"nitin\"}".getBytes());
request.addHeader("Content-Type", "application/json");
request.setMethod("POST");
ActionProxy proxy = getActionProxy("/save");
actions.IoOptimizationAction myAct = (actions.IoOptimizationAction) proxy.getAction();
String result = proxy.execute();
assertEquals("success", result);
System.out.println(response.getContentAsString());
}
UPDATE I changed the test to executeAction as suggested & hence, the 2nd test now looks like
@Test
public void testView() throws Exception {
System.out.println(ActionContext.getContext());
System.out.println(executeAction("optimize/view"));
}
The error stacktrace is :
[2013-10-29 14:50:38.766] [ WARN] MockServletContext.getRealPath:298 - Couldn't determine real path of resource class path resource [org/apache/struts2/dispatcher/error_en_US.ftl]
java.io.FileNotFoundException: class path resource [org/apache/struts2/dispatcher/error_en_US.ftl] cannot be resolved to URL because it does not exist
at org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:179)
at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:48)
at org.springframework.mock.web.MockServletContext.getRealPath(MockServletContext.java:295)
at freemarker.cache.WebappTemplateLoader.findTemplateSource(WebappTemplateLoader.java:129)
at freemarker.cache.MultiTemplateLoader.findTemplateSource(MultiTemplateLoader.java:111)
at freemarker.cache.TemplateCache.acquireTemplateSource(TemplateCache.java:646)
at freemarker.cache.TemplateCache.findTemplateSource(TemplateCache.java:622)
at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:346)
at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:235)
at freemarker.template.Configuration.getTemplate(Configuration.java:578)
at freemarker.template.Configuration.getTemplate(Configuration.java:543)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:841)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:569)
at org.apache.struts2.StrutsJUnit4TestCase.executeAction(StrutsJUnit4TestCase.java:128)
at actions.TestIoOptimizationAction.testView(TestIoOptimizationAction.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:39)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:520)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1060)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:911)
[2013-10-29 14:50:38.810] [ WARN] MockServletContext.getRealPath:298 - Couldn't determine real path of resource class path resource [org/apache/struts2/dispatcher/error_en.ftl]
java.io.FileNotFoundException: class path resource [org/apache/struts2/dispatcher/error_en.ftl] cannot be resolved to URL because it does not exist
at org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:179)
at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:48)
at org.springframework.mock.web.MockServletContext.getRealPath(MockServletContext.java:295)
at freemarker.cache.WebappTemplateLoader.findTemplateSource(WebappTemplateLoader.java:129)
at freemarker.cache.MultiTemplateLoader.findTemplateSource(MultiTemplateLoader.java:111)
at freemarker.cache.TemplateCache.acquireTemplateSource(TemplateCache.java:646)
at freemarker.cache.TemplateCache.findTemplateSource(TemplateCache.java:622)
at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:346)
at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:235)
at freemarker.template.Configuration.getTemplate(Configuration.java:578)
at freemarker.template.Configuration.getTemplate(Configuration.java:543)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:841)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:569)
at org.apache.struts2.StrutsJUnit4TestCase.executeAction(StrutsJUnit4TestCase.java:128)
at actions.TestIoOptimizationAction.testView(TestIoOptimizationAction.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:39)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:520)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1060)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:911)
[2013-10-29 14:50:39.127] [ WARN] MockServletContext.getRealPath:298 - Couldn't determine real path of resource class path resource [org/apache/struts2/dispatcher/error.ftl]
java.io.FileNotFoundException: class path resource [org/apache/struts2/dispatcher/error.ftl] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/C:/Users/hp/.m2/repository/org/apache/struts/struts2-core/2.3.12/struts2-core-2.3.12.jar!/org/apache/struts2/dispatcher/error.ftl
at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:204)
at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:52)
at org.springframework.mock.web.MockServletContext.getRealPath(MockServletContext.java:295)
at freemarker.cache.WebappTemplateLoader.findTemplateSource(WebappTemplateLoader.java:129)
at freemarker.cache.MultiTemplateLoader.findTemplateSource(MultiTemplateLoader.java:111)
at freemarker.cache.TemplateCache.acquireTemplateSource(TemplateCache.java:646)
at freemarker.cache.TemplateCache.findTemplateSource(TemplateCache.java:622)
at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:346)
at freemarker.cache.TemplateCache.getTemplate(TemplateCache.java:235)
at freemarker.template.Configuration.getTemplate(Configuration.java:578)
at freemarker.template.Configuration.getTemplate(Configuration.java:543)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:841)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:569)
at org.apache.struts2.StrutsJUnit4TestCase.executeAction(StrutsJUnit4TestCase.java:128)
at actions.TestIoOptimizationAction.testView(TestIoOptimizationAction.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:39)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:520)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1060)
at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:911)
<html>
<head>
<title>Struts Problem Report</title>
<style>
pre {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<h2>Struts Problem Report</h2>
<p>
Struts has detected an unhandled exception:
</p>
<div id="exception-info">
<table>
<tr>
<td><strong>Messages</strong>:</td>
<td>
</td>
</tr>
<tr>
<td><strong>File</strong>:</td>
<td>org/apache/struts2/impl/StrutsActionProxy.java</td>
</tr>
<tr>
<td><strong>Line number</strong>:</td>
<td>69</td>
</tr>
</table>
</div>
<div id="stacktraces">
<hr />
<h3>Stacktraces</h3>
<div class="stacktrace" style="padding-left: 0em">
<strong>java.lang.NullPointerException</strong>
<div>
<pre>
org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:536)
org.apache.struts2.StrutsJUnit4TestCase.executeAction(StrutsJUnit4TestCase.java:128)
actions.TestIoOptimizationAction.testView(TestIoOptimizationAction.java:44)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
org.junit.runners.ParentRunner.run(ParentRunner.java:236)
junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:39)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:520)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1060)
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:911)
</pre>
</div>
</div>
</div>
<div class="footer">
<hr />
<p>
You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra
debugging behaviors and reports to assist developers. To disable this mode, set:
<pre>
struts.devMode=false
</pre>
in your <code>WEB-INF/classes/struts.properties</code> file.
</p>
</div>
</body>
</html>
If you are using getActionProxy method to execute your actions then you need to set new session map into the invocation context.
ActionProxy actionProxy = getActionProxy("/action");
Map<String, Object> sessionMap = new HashMap<String, Object>();
actionProxy.getInvocation().getInvocationContext().setSession(sessionMap);
actionProxy.execute();
If you don't need reference to action proxy then you can use executeAction method. Note that executeAction will return actual output of the result, not the result returned from execute method.
loweryjk
In my case I needed to call super.setUp from my test.
To avoid request from being null:
request = new MockHttpServletRequest();
For session:
Map<String, Object> sessionMap = new HashMap<String, Object>();
actionProxy.getInvocation().getInvocationContext().setSession(sessionMap);
来源：https://stackoverflow.com/questions/19649952/struts2-3-12-junit4-testcase-request-session-are-null