Add trace succeeded size to default tests

Author: JoseEspinosa

tests/default.nf.test

@@ -20,6 +20,8 @@ nextflow_pipeline {
             assertAll(
                 { assert workflow.success},
                 { assert snapshot(
+  		    // Number of successful tasks
+                    workflow.trace.succeeded().size(),
                     // pipeline versions.yml file for multiqc from which Nextflow version is removed because we test pipelines on multiple Nextflow versions
                     removeNextflowVersion("$outputDir/pipeline_info/nf_core_chipseq_software_mqc_versions.yml"),
                     // All stable path name, with a relative path