Running Groovy unittests from the command-line

Example.groovy

class Example {
    def hhg() { 42 }
}
    

ExampleSpec.groovy

import spock.lang.*
class ExampleSpec extends Specification {

    def "It must be 42" () {
        def ex = new Example()
        expect:
            ex.hhg() == 6*9
    }
}

ExampleTest.groovy

import static org.junit.Assert.*
import org.junit.*

class ExampleTest {
    @Test
    void isIt42() {
        def ex = new Example()
        assertTrue ex.hhg() == 6*9
    }
}

GroovyUnittestsFromCommandline.sh

# Compile the groovy code
groovyc *.groovy

# Running a JUnit4 test
java -cp $GROOVY_HOME/embeddable/groovy-all-2.1.4.jar:$GROOVY_HOME/lib/junit-4.11.jar:$GROOVY_HOME/lib/hamcrest-core-1.3.jar:. \
  org.junit.runner.JUnitCore ExampleTest

# Download Spock if you don't have it
grape install org.spockframework spock-core 0.7-groovy-2.0

# Running a Spock class
java -cp ~/.grapes/org.spockframework/spock-core/jars/spock-core-0.7-groovy-2.0.jar:$GROOVY_HOME/embeddable/groovy-all-2.1.4.jar:$GROOVY_HOME/lib/junit-4.11.jar:$GROOVY_HOME/lib/hamcrest-core-1.3.jar:. \
  org.junit.runner.JUnitCore ExampleSpec

Add this to your spec:

@Grab('org.spockframework:spock-core:2.0-M2-groovy-3.0')
@GrabExclude('org.codehaus.groovy:*')

Then just run (I used 3.0.3):
> groovy ExampleSpec
You can also run your test directly (without change or classpath setup):
> groovy ExampleSpec
And you might consider replacing assertTrue with just assert for an improved power assert error message in your JUnit test.

Thanks Paul.
Does @grab try to pull the jar over the network?
If so then its not an option since this is all running inside a docker container with no network access.
I can't see any difference between your two groovy calls...?
Is there a way Groovy can find the names of the Spec classes by itself?
I'd prefer it if it still worked if people changed the names of their Spec classes.

@grab doesn't have to use a network if you have some local cache/repo. You can also add spock jar(s) to a ${user.home}/.groovy/lib or ${groovy.home}/lib directory.

Ok. Thanks. I now have something that works.

groovyc *.groovy
if [ $? -eq 0 ]; then
  groovy HikerSpec
fi

But it still hard-wires the name HikerSpec.
Do you know if that can be fixed?