add a small working test

Author: nvnieuwk

settings.gradle

@@ -1 +1 @@
-rootProject.name = 'nf-cmgg'
+rootProject.name = 'nf-cmgg'

src/main/groovy/nfcmgg/plugin/DoneObserver.groovy

@@ -25,7 +25,6 @@ import groovy.util.logging.Slf4j
 import nextflow.Session
 import nextflow.trace.TraceObserverV2
 
-
 /**
  * Implements an observer that allows implementing custom
  * logic on nextflow execution events.

src/test/groovy/nfcmgg/plugin/CmggObserverTest.groovy

@@ -12,14 +12,11 @@ import spock.lang.Specification
 @CompileDynamic
 class CmggObserverTest extends Specification {
 
-    // void 'should create the observer instance'() {
-    //     given:
-    //     CmggFactory factory = new CmggFactory()
-    //     when:
-    //     Object result = factory.create(Mock(Session))
-    //     then:
-    //     result.size() == 1
-    //     result.first() instanceof CmggObserver
-    // }
+    void 'should create the observer instance'() {
+        given:
+        CmggFactory factory = new CmggFactory()
+        expect:
+        factory.create(Mock(Session)).size() == 0
+    }
 
 }