Sketch test for kraken subworkflow

tests/pipeline/kraken.nf.test

@@ -0,0 +1,39 @@
+nextflow_workflow {
+
+    name "Test Workflow "
+    script "workflows/demultiplex.nf"
+    workflow "DEMULTIPLEX"
+    tag "kraken"
+    tag "pipeline"
+
+    test("KRAKEN") {
+
+        setup {
+            run("UNTAR") {
+                script "modules/nf-core/untar/main.nf"
+                process {
+                    """
+                    input[0] = Channel.of([ [], file("https://raw.githubusercontent.com/nf-core/test-datasets/modules/data/genomics/sarscov2/genome/db/kraken2.tar.gz", checkIfExists: true) ])
+                    """
+                }
+            }
+        }
+
+        when {
+            params {
+                input         = 'https://raw.githubusercontent.com/nf-core/test-datasets/demultiplex/samplesheet/1.3.0/flowcell_input.csv'
+                demultiplexer = 'bclconvert'
+                outdir        = "$outputDir"
+                //kraken_db     = UNTAR.out.untar.map{ it[1] }
+            }
+        }
+
+        then {
+            assertAll(
+                { assert workflow.success },
+            )
+        }
+
+    }
+
+}