How to test static java methods in groovy SPOCK framework? - unit-testing

Question

I am trying to test static java method in SPOCK groovy framework using Maven.
Here is the java class
public class DataController {
private DataInterface userService;
public void setUserService(DataInterface userService) {
this.userService = userService;
}
public static int addNumber(){
int a = 10;
int b = 20;
return a+b;
}
}
Here is the SPOCK test in groovy
#PrepareForTest([DataController.class])
class BasicMockStaticTest extends Specification {
#Rule PowerMockRule powerMockRule = new PowerMockRule();
def "When mocking static"() {
setup :
PowerMockito.mockStatic(DataController.class)
when :
Mockito.when(DataController.addNumber()).thenReturn(30);
then :
DataController.addNumber() == 30
}
}
and the POM File snippet
<dependencies>
<!-- Spock Framework basic dependencies: -->
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.3.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.spockframework</groupId>
<artifactId>spock-core</artifactId>
<!-- The version have to be compatible with Groovy -->
<version>1.0-groovy-2.3</version>
<scope>test</scope>
</dependency>
<!-- To use Hamcrest matchers: -->
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<!-- To mock classes: -->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib-nodep</artifactId>
<version>3.1</version>
<scope>test</scope>
</dependency>
<!-- Use with cglib to mock classes without default constructor: -->
<dependency>
<groupId>org.objenesis</groupId>
<artifactId>objenesis</artifactId>
<version>2.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.codehaus.gmavenplus</groupId>
<artifactId>gmavenplus-plugin</artifactId>
<version>1.5</version>
</dependency>
<!-- Power mock dependencies -->
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>1.5.4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4-rule</artifactId>
<version>1.5.4</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-classloading-xstream</artifactId>
<version>1.5.4</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<testSourceDirectory>E:\Workspace\Mars\rg\Spock\src\test\groovy</testSourceDirectory>
<pluginManagement>
<plugins>
<!-- GMavenPlus plugin -->
<plugin>
<groupId>org.codehaus.gmavenplus</groupId>
<artifactId>gmavenplus-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<goals>
<goal>addSources</goal>
<goal>addTestSources</goal>
<goal>generateStubs</goal>
<goal>compile</goal>
<goal>testGenerateStubs</goal>
<goal>testCompile</goal>
<goal>removeStubs</goal>
<goal>removeTestStubs</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Only required if names of spec classes don't match default Surefire patterns (`*Test` etc.) -->
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.6</version>
<configuration>
<useFile>false</useFile>
<includes>
<include>**/*Test*.*</include>
<include>**/*Spec*.*</include>
</includes>
I have 4 test cases in the groovy folder , 3 are passing , but this static method test is giving error as
When mocking static(BasicMockStaticTest) Time elapsed: 0.104 sec <<< ERROR!
java.lang.IllegalStateException: Extension API internal error: org.powermock.api.extension.proxyframework.ProxyFrameworkImpl could not be located in classpath.
at org.powermock.modules.junit4.rule.PowerMockClassloaderExecutor.registerProxyframework(PowerMockClassloaderExecutor.java:60)
at org.powermock.modules.junit4.rule.PowerMockClassloaderExecutor.forClass(PowerMoc kClassloaderExecutor.java:50)
at org.powermock.modules.junit4.rule.PowerMockRule.apply(PowerMockRule.java:31)
at org.spockframework.runtime.extension.builtin.MethodRuleInterceptor.intercept(MethodRuleInterceptor.java:37)
at org.spockframework.runtime.extension.MethodInvocation.proceed(MethodInvocation.java:87)
at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:59)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120)
at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:103)
at org.apache.maven.surefire.Surefire.run(Surefire.java:169)
at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)
at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)
I am running mvn test to test these junits , I tried changing the version of cglib-nodep from 3.1 to 2.2.2 but it did not work.
I checked in the java build path following jar files are included
powermock-module-junit4-1.5.4
powermock-module-junit4-common-1.5.4
powermock-reflect-1.5.4
powermock-module-junit4-rule-1.5.4
powermock-classloading-base-1.5.4
powermock-classloading-xstream-1.5.4
powermock-api-support-1.5.4
powermock-core-1.5.4
groovy-all-2.3.1.jar
spock-core-1.0-grovy-2.3.jar
I also added powermock-mockito-release-full-1.5.4 but after adding that none of the test cases ran and build was success but that was not my intent.
I am suspecting may be some of the dependencies are missing or some of the existing are conflicting but not able to move forward.
Can any one tell what is wrong , I can move forward with the test case even if it fails , I will correct it but I need to remove the error first .
On a side note I did try groovyMock also but it gave nullpointer exception for static method , then I searched and found static method did not work with groovyMock.
I have tried top google link results with popular blogs and tutorial but none seems to work.

Answer 1

I'm using GroovyMock in Spock to test static methods (static methods in Java, BTW):
GroovyMock(Foo, global: true)
Foo.bar(_) >> "my-fake-result"
I also added this annotation to my test method in Spock,
to my mock not interfere in other tests:
#ConfineMetaClassChanges([Foo])