[rules-users] JUnit testing

[Edson Tirelli]

   All,

   I see that the code in that spot is weak and could be improved. Although,
using drools 4.0.7, I successfully created a junit 4 test that I paste
bellow. Also, the whole drools code is tested with junit 3 and we have no
problems. For instance, look at our integration tests here:

http://anonsvn.labs.jboss.com/labs/jbossrules/branches/4.0.x/drools-compiler/src/test/java/org/drools/integrationtests/

   The code I used to create the junit 4 test is based on the default
example create by the drools plugin + the snippet you showed bellow:

    @Test
    public void testRuleBase() {
        try {

            //load up the rulebase
            RuleBase ruleBase = readRule();
            StatefulSession workingMemory = ruleBase.newStatefulSession();

            //go !
            Message message = new Message();
            message.setMessage(  "Hello World" );
            message.setStatus( Message.HELLO );
            workingMemory.insert( message );
            workingMemory.fireAllRules();
            workingMemory.dispose();

        } catch (Throwable t) {
            t.printStackTrace();
            Assert.fail("Something is wrong: "+t.getMessage());
        }
    }

    /**
     * Please note that this is the "low level" rule assembly API.
     */
    private RuleBase readRule() throws Exception {
        //read in the source
        Reader source = new InputStreamReader(
DroolsTest.class.getResourceAsStream( "/Sample.drl" ) );

        PackageBuilderConfiguration conf = new
PackageBuilderConfiguration();
        JavaDialectConfiguration javaConf = (JavaDialectConfiguration)
conf.getDialectConfiguration("java");
        javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
        javaConf.setJavaLanguageLevel("1.5");

        PackageBuilder builder = new PackageBuilder( conf );
        builder.addPackageFromDrl( source );

        RuleBase ruleBase = RuleBaseFactory.newRuleBase();
        ruleBase.addPackage( builder.getPackage() );
        return ruleBase;
    }

    Hope it helps,
      Edson


2008/5/19 Marcus Ilgner <marcus.ilgner at gmail.com>:

> Hi list,
>
> I'm reviving this thread because I happen to have the same problem.
>
> On Sun, Mar 23, 2008 at 7:34 PM, Mike Dean <mdean77 at comcast.net> wrote:
> >
> > Thanks (months later!).  I have cut down my code example below to show
> this
> > issue more clearly:
> >
> >
> > John J. Franey wrote:
> >>
> >> NullPointerException on line 146 means classLoader is null.   That is
> odd.
> >> I have no idea why the code that gets classLoader won't work in
> eclipse's
> >> junit runtime, but does when run in your eclipse plugin.
>
>  It seems indeed like during JUnit tests, the context classloader of
> the thread gets not set (null).
>
> The code leading up to the problem is as follows:
> PackageBuilderConfiguration conf = new PackageBuilderConfiguration();
> JavaDialectConfiguration javaConf = (JavaDialectConfiguration)
> conf.getDialectConfiguration("java");
> javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);
> javaConf.setJavaLanguageLevel("1.5");
> RuleBase ruleBase = RuleBaseFactory.newRuleBase();
>
> The resulting stacktrace is:
> java.lang.NullPointerException
>        at
> org.drools.RuleBaseConfiguration.instantiateClass(RuleBaseConfiguration.java:569)
>        at
> org.drools.RuleBaseConfiguration.determineConsequenceExceptionHandler(RuleBaseConfiguration.java:561)
>        at
> org.drools.RuleBaseConfiguration.init(RuleBaseConfiguration.java:220)
>        at
> org.drools.RuleBaseConfiguration.<init>(RuleBaseConfiguration.java:133)
>        at
> org.drools.common.AbstractRuleBase.<init>(AbstractRuleBase.java:147)
>        at org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase.java:124)
>        at org.drools.reteoo.ReteooRuleBase.<init>(ReteooRuleBase.java:101)
>        at org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:57)
>        at org.drools.RuleBaseFactory.newRuleBase(RuleBaseFactory.java:38)
>
> Has anyone set up Drools and JUnit successfully? Maybe we forgot to
> set up the environment properly?
>
> Best regards
> Marcus
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>



-- 
Edson Tirelli
JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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