The JUnit test fails with an Ant error with the task `<junit>`, but passes with `<exec>`?

Question

I am automating my JUnit tests in my Ant build. However, my simple test passes only when launched from the IDE and command line, but does not run with the Ant <junit> task. When I run it from the command line (technically I use the Ant <exec> task), the result:

 clean: compile_tests: [javac] Compiling 2 source files to C:\MY_TEMP junit_exec: [exec] JUnit version 4.10 [exec] . [exec] Time: 0.004 [exec] [exec] OK (1 test) [exec] BUILD SUCCESSFUL Total time: 1 second 

but when I use the <junit> task:

 Buildfile: C:\MY_TEMP\build.xml clean: compile_tests: [javac] Compiling 2 source files to C:\MY_TEMP junit_ant: [echo] junit_ant started [junit] Test SimpleTest FAILED BUILD SUCCESSFUL Total time: 0 seconds 

MY_TEMP content: junit-4.10.jar , SimpleTest.java and build.xml .

I copied junit-4.10.jar to the %ANT_HOME%\lib folder as an Ant junit task documentation suggestion. He already had both ant-junit.jar and ant-junit4.jar .

My version of Java is 1.6.0_26.

My test:

 // YES, this is the default package import org.junit.*; public class SimpleTest { @Test public void mySimpleTest(){ Assert.assertEquals( 2, 1 + 1 ); } } 

And my Ant file (build.xml):

 <?xml version="1.0"?> <project name="regression_tests" basedir="."> <target name="clean"> <delete> <fileset dir="." includes="*.class" /> </delete> </target> <target name="compile_tests" depends="clean"> <javac srcdir="." destdir="." source="1.6" target="1.6" includeantruntime="false" > <classpath> <pathelement location="./junit-4.10.jar" /> </classpath> </javac> </target> <target name="junit_ant" depends="compile_tests" > <echo message="junit_ant started" /> <junit> <test name="SimpleTest" /> </junit> </target> <target name="junit_exec" depends="compile_tests"> <exec executable="java" dir="." > <arg value="-classpath" /> <arg value=".;junit-4.10.jar" /> <arg value="org.junit.runner.JUnitCore" /> <arg value="SimpleTest" /> </exec> </target> </project> 

Answer 1

If the test goes one way and the other goes the other way, it is more likely to be associated with the classpath, since it cannot find the test class, the class being tested, or the library.

Test output should help clarify if this is a problem.

Answer 2

In particular, I edited the junit_ant task:

  <junit> <classpath location="." /> <test name="SimpleTest" /> <formatter type="xml" /> </junit> <junitreport todir="."> <fileset dir="."> <include name="TEST-*.xml" /> </fileset> <report todir="." /> </junitreport> 

Which then showed me that the failure was java.lang.ClassNotFoundException: SimpleTest , so I just added <classpath location="." /> <classpath location="." /> to the <junit> task, and then it worked.

Answer 3

Add this line for more information:

 <formatter type="brief" usefile="false"/>