diff --git a/modules/bclconvert/.gitignore b/modules/bclconvert/.gitignore
new file mode 100644
index 00000000..45b0ea3a
--- /dev/null
+++ b/modules/bclconvert/.gitignore
@@ -0,0 +1,2 @@
+bcl-convert
+*.rpm
diff --git a/modules/bclconvert/Dockerfile b/modules/bclconvert/Dockerfile
new file mode 100644
index 00000000..df3e1d0f
--- /dev/null
+++ b/modules/bclconvert/Dockerfile
@@ -0,0 +1,15 @@
+# Dockerfile to create container with bcl-convert
+# Push to nfcore/bclconvert:<VER>
+
+FROM debian:bullseye-slim
+LABEL authors="Matthias De Smet <matthias.desmet@ugent.be>" \
+    description="Docker image containing bcl-convert"
+# Disclaimer: this container is not provided nor supported by Illumina
+# 'ps' command is need by some nextflow executions to collect system stats
+# Install procps and clean apt cache
+RUN apt-get update \
+    && apt-get install -y \
+    procps \
+    && apt-get clean -y && rm -rf /var/lib/apt/lists/*
+COPY bcl-convert /usr/local/bin/bcl-convert
+RUN chmod +x /usr/local/bin/bcl-convert
diff --git a/modules/bclconvert/LICENSE b/modules/bclconvert/LICENSE
new file mode 100644
index 00000000..6f523227
--- /dev/null
+++ b/modules/bclconvert/LICENSE
@@ -0,0 +1,30 @@
+ILLUMINA END-USER SOFTWARE LICENSE AGREEMENT
+
+IMPORTANT-READ CAREFULLY. THIS IS A LICENSE AGREEMENT THAT YOU ARE REQUIRED TO ACCEPT BEFORE, DOWNLOADING, INSTALLING AND USING ANY SOFTWARE MADE AVAILABLE FROM THE ILLUMINA SUPPORT CENTER (https://support.illumina.com).
+
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+
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+Ownership. The Software is protected by United States and international intellectual property laws. All right, title, and interest in and to the Software (including associated intellectual property rights) are and will remain vested in Illumina or Illumina’s affiliated companies or licensors. Licensee acknowledges that no rights, license or interest to any Illumina trademarks are granted hereunder. Licensee acknowledges that unauthorized reproduction or distribution of the Software, or any portion of it, may result in severe civil and criminal penalties.  Illumina reserves all rights in and to the Software not expressly granted to Licensee under this Agreement.
+Upgrades/Updates. Illumina may, at its sole discretion, provide updates or upgrades to the Software. In that case, Licensee WILL have the same rights and obligations under such updates or upgrades as it has for the versions of the Software initially provided to Licensee hereunder.  Licensee recognizes that Illumina is not obligated to provide any upgrades or updates to, or support for, the Software.
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+END OF END-USER SOFTWARE LICENSE AGREEMENT.
diff --git a/modules/bclconvert/README.md b/modules/bclconvert/README.md
new file mode 100644
index 00000000..4f8538d0
--- /dev/null
+++ b/modules/bclconvert/README.md
@@ -0,0 +1,17 @@
+# Updating the docker container and making a new module release
+
+bcl-convert is a commercial tool from Illumina. The container provided for the bcl-convert nf-core module is not provided nor supported by Illumina. Updating the bcl-convert versions in the container and pushing the update to Dockerhub needs to be done manually.
+
+1. Navigate to the appropriate download page. - [BCL Convert](https://support.illumina.com/sequencing/sequencing_software/bcl-convert/downloads.html): download the rpm of the desired bcl-convert version with `curl` or `wget`.
+2. Unpack the RPM package using `rpm2cpio bcl-convert-*.rpm | cpio -i --make-directories`. Place the executable located in `<unpack_dir>/usr/bin/bcl-convert` in the same folder where the Dockerfile lies.
+3. Create and test the container:
+
+   ```bash
+   docker build . -t nfcore/bclconvert:<VERSION>
+   ```
+
+4. Access rights are needed to push the container to the Dockerhub nfcore organization, please ask a core team member to do so.
+
+   ```bash
+   docker push nfcore/bclconvert:<VERSION>
+   ```
diff --git a/modules/bclconvert/main.nf b/modules/bclconvert/main.nf
new file mode 100644
index 00000000..e6925b50
--- /dev/null
+++ b/modules/bclconvert/main.nf
@@ -0,0 +1,81 @@
+process BCLCONVERT {
+    tag '$samplesheet'
+    label 'process_high'
+
+    if (params.enable_conda) {
+        exit 1, "Conda environments cannot be used when using bcl-convert. Please use docker or singularity containers."
+    }
+    container "nfcore/bclconvert:3.9.3"
+
+    input:
+    path samplesheet
+    path run_dir
+
+    output:
+    path "*.fastq.gz"               ,emit: fastq
+    path "Reports/*.{csv,xml,bin}"  ,emit: reports
+    path "Logs/*.{log,txt}"         ,emit: logs
+    path "InterOp/*.bin"            ,emit: interop
+    path "versions.yml"             ,emit: versions
+
+    when:
+    task.ext.when == null || task.ext.when
+
+    script:
+    def args = task.ext.args ?: ''
+
+    """
+    bcl-convert \
+        $args \\
+        --output-directory . \\
+        --bcl-input-directory ${run_dir} \\
+        --sample-sheet ${samplesheet} \\
+        --bcl-num-parallel-tiles ${task.cpus}
+
+    mkdir InterOp
+    cp ${run_dir}/InterOp/*.bin InterOp/
+    mv Reports/*.bin InterOp/
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        bclconvert: \$(bcl-convert -V 2>&1 | head -n 1 | sed 's/^.*Version //')
+    END_VERSIONS
+    """
+
+    stub:
+    """
+    echo "sample1_S1_L001_R1_001" > sample1_S1_L001_R1_001.fastq.gz
+    echo "sample1_S1_L001_R2_001" > sample1_S1_L001_R2_001.fastq.gz
+    echo "sample1_S1_L002_R1_001" > sample1_S1_L002_R1_001.fastq.gz
+    echo "sample1_S1_L002_R2_001" > sample1_S1_L002_R2_001.fastq.gz
+    echo "sample2_S2_L001_R1_001" > sample2_S2_L001_R1_001.fastq.gz
+    echo "sample2_S2_L001_R2_001" > sample2_S2_L001_R2_001.fastq.gz
+    echo "sample2_S2_L002_R1_001" > sample2_S2_L002_R1_001.fastq.gz
+    echo "sample2_S2_L002_R2_001" > sample2_S2_L002_R2_001.fastq.gz
+
+    mkdir Reports
+    echo "Adapter_Metrics" >  Reports/Adapter_Metrics.csv
+    echo "Demultiplex_Stats" >  Reports/Demultiplex_Stats.csv
+    echo "fastq_list" >  Reports/fastq_list.csv
+    echo "Index_Hopping_Counts" >  Reports/Index_Hopping_Counts.csv
+    echo "IndexMetricsOut" >  Reports/IndexMetricsOut.bin
+    echo "Quality_Metrics" >  Reports/Quality_Metrics.csv
+    echo "RunInfo" >  Reports/RunInfo.xml
+    echo "SampleSheet" >  Reports/SampleSheet.csv
+    echo "Top_Unknown_Barcodes" >  Reports/Top_Unknown_Barcodes.csv
+
+    mkdir Logs
+    echo "Errors" > Logs/Errors.log
+    echo "FastqComplete" > Logs/FastqComplete.txt
+    echo "Info" > Logs/Info.log
+    echo "Warnings" > Logs/Warnings.log
+
+    mkdir InterOp/
+    echo "InterOp" > InterOp/InterOp.bin
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        bclconvert: \$(bcl-convert -V 2>&1 | head -n 1 | sed 's/^.*Version //')
+    END_VERSIONS
+    """
+}
diff --git a/modules/bclconvert/meta.yml b/modules/bclconvert/meta.yml
new file mode 100644
index 00000000..5c59a978
--- /dev/null
+++ b/modules/bclconvert/meta.yml
@@ -0,0 +1,45 @@
+name: "bclconvert"
+description: Demultiplex Illumina BCL files
+keywords:
+  - demultiplex
+  - illumina
+  - fastq
+tools:
+  - "bclconvert":
+      description: "Demultiplex Illumina BCL files"
+      homepage: "https://support.illumina.com/sequencing/sequencing_software/bcl-convert.html"
+      documentation: "https://support-docs.illumina.com/SW/BCL_Convert/Content/SW/FrontPages/BCL_Convert.htm"
+      licence: "ILLUMINA"
+
+input:
+  - samplesheet:
+      type: file
+      description: "Input samplesheet"
+      pattern: "*.{csv}"
+  - run_dir:
+      type: directory
+      description: "Input run directory containing RunInfo.xml and BCL data"
+
+output:
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: "versions.yml"
+  - fastq:
+      type: file
+      description: Demultiplexed FASTQ files
+      pattern: "*.{fastq.gz}"
+  - reports:
+      type: file
+      description: Demultiplexing Reports
+      pattern: "Reports/*.{csv,xml}"
+  - logs:
+      type: file
+      description: Log files
+      pattern: "Logs/*.{log,txt}"
+  - interop:
+      type: file
+      description: Interop files
+      pattern: "Interop/*.{bin}"
+authors:
+  - "@matthdsm"
diff --git a/modules/elprep/filter/main.nf b/modules/elprep/filter/main.nf
new file mode 100644
index 00000000..5ca288bc
--- /dev/null
+++ b/modules/elprep/filter/main.nf
@@ -0,0 +1,89 @@
+process ELPREP_FILTER {
+    tag "$meta.id"
+    label 'process_high'
+
+    conda (params.enable_conda ? "bioconda::elprep=5.1.2" : null)
+    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
+        'https://depot.galaxyproject.org/singularity/elprep:5.1.2--he881be0_0':
+        'quay.io/biocontainers/elprep:5.1.2--he881be0_0' }"
+
+    input:
+    tuple val(meta), path(bam)
+    val(run_haplotypecaller)
+    val(run_bqsr)
+    path(reference_sequences)
+    path(filter_regions_bed)
+    path(reference_elfasta)
+    path(known_sites_elsites)
+    path(target_regions_bed)
+    path(intermediate_bqsr_tables)
+    val(bqsr_tables_only)
+    val(get_activity_profile)
+    val(get_assembly_regions)
+
+
+    output:
+    tuple val(meta), path("output/**.{bam,sam}")    ,emit: bam
+    tuple val(meta), path("*.metrics.txt")          ,optional: true, emit: metrics
+    tuple val(meta), path("*.recall")               ,optional: true, emit: recall
+    tuple val(meta), path("*.vcf.gz")               ,optional: true, emit: gvcf
+    tuple val(meta), path("*.table")                ,optional: true, emit: table
+    tuple val(meta), path("*.activity_profile.igv") ,optional: true, emit: activity_profile
+    tuple val(meta), path("*.assembly_regions.igv") ,optional: true, emit: assembly_regions
+    path "versions.yml"                             ,emit: versions
+
+    when:
+    task.ext.when == null || task.ext.when
+
+    script:
+    def args = task.ext.args ?: ''
+    def prefix = task.ext.prefix ?: "${meta.id}"
+    def suffix = args.contains("--output-type sam") ? "sam" : "bam"
+
+    // filter args
+    def reference_sequences_cmd = reference_sequences ? " --replace-reference-sequences ${reference_sequences}" : ""
+    def filter_regions_cmd      = filter_regions_bed  ? " --filter-non-overlapping-reads ${filter_regions_bed}" : ""
+
+    // markdup args
+    def markdup_cmd = args.contains("--mark-duplicates") ? " --mark-optical-duplicates ${prefix}.metrics.txt": ""
+
+    // variant calling args
+    def haplotyper_cmd = run_haplotypecaller ? " --haplotypecaller ${prefix}.g.vcf.gz": ""
+
+    def fasta_cmd           = reference_elfasta   ? " --reference ${reference_elfasta}": ""
+    def known_sites_cmd     = known_sites_elsites ? " --known-sites ${known_sites_elsites}": ""
+    def target_regions_cmd  = target_regions_bed  ? " --target-regions ${target_regions_bed}": ""
+
+    // bqsr args
+    def bqsr_cmd = run_bqsr ? " --bqsr ${prefix}.recall": ""
+    def bqsr_tables_only_cmd = bqsr_tables_only ? " --bqsr-tables-only ${prefix}.table": ""
+
+    def intermediate_bqsr_cmd = intermediate_bqsr_tables ? " --bqsr-apply .": ""
+
+    // misc
+    def activity_profile_cmd = get_activity_profile ? " --activity-profile ${prefix}.activity_profile.igv": ""
+    def assembly_regions_cmd = get_assembly_regions ? " --assembly-regions ${prefix}.assembly_regions.igv": ""
+
+    """
+    elprep filter ${bam} output/${prefix}.${suffix} \\
+        ${reference_sequences_cmd} \\
+        ${filter_regions_cmd} \\
+        ${markdup_cmd} \\
+        ${haplotyper_cmd} \\
+        ${fasta_cmd} \\
+        ${known_sites_cmd} \\
+        ${target_regions_cmd} \\
+        ${bqsr_cmd} \\
+        ${bqsr_tables_only_cmd} \\
+        ${intermediate_bqsr_cmd} \\
+        ${activity_profile_cmd} \\
+        ${assembly_regions_cmd} \\
+        --nr-of-threads ${task.cpus} \\
+        $args
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        elprep: \$(elprep 2>&1 | head -n2 | tail -n1 |sed 's/^.*version //;s/ compiled.*\$//')
+    END_VERSIONS
+    """
+}
diff --git a/modules/elprep/filter/meta.yml b/modules/elprep/filter/meta.yml
new file mode 100644
index 00000000..d7d41071
--- /dev/null
+++ b/modules/elprep/filter/meta.yml
@@ -0,0 +1,106 @@
+name: "elprep_filter"
+description: "Filter, sort and markdup sam/bam files, with optional BQSR and variant calling."
+keywords:
+  - sort
+  - bam
+  - sam
+  - filter
+  - variant calling
+tools:
+  - "elprep":
+      description: "elPrep is a high-performance tool for preparing .sam/.bam files for variant calling in sequencing pipelines. It can be used as a drop-in replacement for SAMtools/Picard/GATK4."
+      homepage: "https://github.com/ExaScience/elprep"
+      documentation: "https://github.com/ExaScience/elprep"
+      tool_dev_url: "https://github.com/ExaScience/elprep"
+      doi: "10.1371/journal.pone.0244471"
+      licence: "['AGPL v3']"
+
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - bam:
+      type: file
+      description: Input SAM/BAM file
+      pattern: "*.{bam,sam}"
+  - run_haplotypecaller:
+      type: boolean
+      description: Run variant calling on the input files. Needed to generate gvcf output.
+  - run_bqsr:
+      type: boolean
+      description: Run BQSR on the input files. Needed to generate recall metrics.
+  - reference_sequences:
+      type: file
+      description: Optional SAM header to replace existing header.
+      pattern: "*.sam"
+  - filter_regions_bed:
+      type: file
+      description: Optional BED file containing regions to filter.
+      pattern: "*.bed"
+  - reference_elfasta:
+      type: file
+      description: Elfasta file, required for BQSR and variant calling.
+      pattern: "*.elfasta"
+  - known_sites:
+      type: file
+      description: Optional elsites file containing known SNPs for BQSR.
+      pattern: "*.elsites"
+  - target_regions_bed:
+      type: file
+      description: Optional BED file containing target regions for BQSR and variant calling.
+      pattern: "*.bed"
+  - intermediate_bqsr_tables:
+      type: file
+      description: Optional list of BQSR tables, used when parsing files created by `elprep split`
+      pattern: "*.table"
+  - bqsr_tables_only:
+      type: boolean
+      description: Write intermediate BQSR tables, used when parsing files created by `elprep split`.
+  - get_activity_profile:
+      type: boolean
+      description: Get the activity profile calculated by the haplotypecaller to the given file in IGV format.
+  - get_assembly_regions:
+      type: boolean
+      description: Get the assembly regions calculated by haplotypecaller to the speficied file in IGV format.
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: "versions.yml"
+  - bam:
+      type: file
+      description: Sorted, markdup, optionally BQSR BAM/SAM file
+      pattern: "*.{bam,sam}"
+  - metrics:
+      type: file
+      description: Optional duplicate metrics file generated by elprep
+      pattern: "*.{metrics.txt}"
+  - recall:
+      type: file
+      description: Optional recall metrics file generated by elprep
+      pattern: "*.{recall}"
+  - gvcf:
+      type: file
+      description: Optional GVCF output file
+      pattern: "*.{vcf.gz}"
+  - table:
+      type: file
+      description: Optional intermediate BQSR table output file
+      pattern: "*.{table}"
+  - activity_profile:
+      type: file
+      description: Optional activity profile output file
+      pattern: "*.{activity_profile.igv}"
+  - assembly_regions:
+      type: file
+      description: Optional activity regions output file
+      pattern: "*.{assembly_regions.igv}"
+authors:
+  - "@matthdsm"
diff --git a/modules/elprep/split/main.nf b/modules/elprep/split/main.nf
new file mode 100644
index 00000000..639944ef
--- /dev/null
+++ b/modules/elprep/split/main.nf
@@ -0,0 +1,45 @@
+process ELPREP_SPLIT {
+    tag "$meta.id"
+    label 'process_low'
+
+    conda (params.enable_conda ? "bioconda::elprep=5.1.2" : null)
+    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
+        'https://depot.galaxyproject.org/singularity/elprep:5.1.2--he881be0_0':
+        'quay.io/biocontainers/elprep:5.1.2--he881be0_0' }"
+
+    input:
+    tuple val(meta), path(bam)
+
+    output:
+    tuple val(meta), path("output/**.{bam,sam}"), emit: bam
+    path "versions.yml"           , emit: versions
+
+    when:
+    task.ext.when == null || task.ext.when
+
+    script:
+    def args        = task.ext.args ?: ''
+    def prefix      = task.ext.prefix ?: "${meta.id}"
+    def single_end  = meta.single_end ? " --single-end": ""
+
+    """
+    # create directory and move all input so elprep can find and merge them before splitting
+    mkdir input
+    mv ${bam} input/
+
+    mkdir ${prefix}
+
+    elprep split \\
+        input \\
+        output/ \\
+        $args \\
+        $single_end \\
+        --nr-of-threads $task.cpus \\
+        --output-prefix $prefix
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        elprep: \$(elprep 2>&1 | head -n2 | tail -n1 |sed 's/^.*version //;s/ compiled.*\$//')
+    END_VERSIONS
+    """
+}
diff --git a/modules/elprep/split/meta.yml b/modules/elprep/split/meta.yml
new file mode 100644
index 00000000..b99562fa
--- /dev/null
+++ b/modules/elprep/split/meta.yml
@@ -0,0 +1,43 @@
+name: "elprep_split"
+description: Split bam file into manageable chunks
+keywords:
+  - bam
+  - split by chromosome
+tools:
+  - "elprep":
+      description: "elPrep is a high-performance tool for preparing .sam/.bam files for variant calling in sequencing pipelines. It can be used as a drop-in replacement for SAMtools/Picard/GATK4."
+      homepage: "https://github.com/ExaScience/elprep"
+      documentation: "https://github.com/ExaScience/elprep"
+      tool_dev_url: "https://github.com/ExaScience/elprep"
+      doi: "10.1371"
+      licence: "['AGPL v3']"
+
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - bam:
+      type: file
+      description: List of BAM/SAM files
+      pattern: "*.{bam,sam}"
+
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  #
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: "versions.yml"
+  - bam:
+      type: file
+      description: List of split BAM/SAM files
+      pattern: "*.{bam,sam}"
+
+authors:
+  - "@matthdsm"
diff --git a/modules/kaiju/kaiju2table/main.nf b/modules/kaiju/kaiju2table/main.nf
new file mode 100644
index 00000000..00739d1e
--- /dev/null
+++ b/modules/kaiju/kaiju2table/main.nf
@@ -0,0 +1,40 @@
+process KAIJU_KAIJU2TABLE {
+    tag "$meta.id"
+    label 'process_low'
+
+    conda (params.enable_conda ? "bioconda::kaiju=1.8.2" : null)
+    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
+        'https://depot.galaxyproject.org/singularity/kaiju:1.8.2--h5b5514e_1':
+        'quay.io/biocontainers/kaiju:1.8.2--h2e03b76_0' }"
+
+    input:
+    tuple val(meta), path(results)
+    path db
+    val taxon_rank
+
+    output:
+    tuple val(meta), path('*.txt'), emit: summary
+    path "versions.yml"           , emit: versions
+
+    when:
+    task.ext.when == null || task.ext.when
+
+    script:
+    def args = task.ext.args ?: ''
+    def prefix = task.ext.prefix ?: "${meta.id}"
+    """
+    dbnodes=`find -L ${db} -name "*nodes.dmp"`
+    dbname=`find -L ${db} -name "*.fmi" -not -name "._*"`
+    kaiju2table   $args \\
+        -t \$dbnodes \\
+        -n \$dbname \\
+        -r ${taxon_rank} \\
+        -o ${prefix}.txt \\
+        ${results}
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        kaiju: \$(echo \$( kaiju -h 2>&1 | sed -n 1p | sed 's/^.*Kaiju //' ))
+    END_VERSIONS
+    """
+}
diff --git a/modules/kaiju/kaiju2table/meta.yml b/modules/kaiju/kaiju2table/meta.yml
new file mode 100644
index 00000000..bc3e85d7
--- /dev/null
+++ b/modules/kaiju/kaiju2table/meta.yml
@@ -0,0 +1,50 @@
+name: "kaiju_kaiju2table"
+description: write your description here
+keywords:
+  - classify
+  - metagenomics
+tools:
+  - kaiju:
+      description: Fast and sensitive taxonomic classification for metagenomics
+      homepage: https://kaiju.binf.ku.dk/
+      documentation: https://github.com/bioinformatics-centre/kaiju/blob/master/README.md
+      tool_dev_url: https://github.com/bioinformatics-centre/kaiju
+      doi: "10.1038/ncomms11257"
+      licence: ["GNU GPL v3"]
+
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - results:
+      type: file
+      description: File containing the kaiju classification results
+      pattern: "*.{txt}"
+  - taxon_rank:
+      type: string
+      description: |
+        Taxonomic rank to display in report
+        pattern: "phylum|class|order|family|genus|species"
+
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: "versions.yml"
+  - results:
+      type: file
+      description: |
+        Summary table for a given taxonomic rank
+      pattern: "*.{tsv}"
+
+authors:
+  - "@sofstam"
+  - "@talnor"
+  - "@jfy133"
diff --git a/modules/kraken2/kraken2/main.nf b/modules/kraken2/kraken2/main.nf
index 3ec5df52..d4000233 100644
--- a/modules/kraken2/kraken2/main.nf
+++ b/modules/kraken2/kraken2/main.nf
@@ -10,12 +10,15 @@ process KRAKEN2_KRAKEN2 {
     input:
     tuple val(meta), path(reads)
     path  db
+    val save_output_fastqs
+    val save_reads_assignment
 
     output:
-    tuple val(meta), path('*classified*')  , emit: classified
-    tuple val(meta), path('*unclassified*'), emit: unclassified
-    tuple val(meta), path('*report.txt')   , emit: txt
-    path "versions.yml"                    , emit: versions
+    tuple val(meta), path('*classified*')     , optional:true, emit: classified_reads_fastq
+    tuple val(meta), path('*unclassified*')   , optional:true, emit: unclassified_reads_fastq
+    tuple val(meta), path('*classifiedreads*'), optional:true, emit: classified_reads_assignment
+    tuple val(meta), path('*report.txt')                     , emit: report
+    path "versions.yml"                                      , emit: versions
 
     when:
     task.ext.when == null || task.ext.when
@@ -26,19 +29,25 @@ process KRAKEN2_KRAKEN2 {
     def paired       = meta.single_end ? "" : "--paired"
     def classified   = meta.single_end ? "${prefix}.classified.fastq"   : "${prefix}.classified#.fastq"
     def unclassified = meta.single_end ? "${prefix}.unclassified.fastq" : "${prefix}.unclassified#.fastq"
+    def classified_command = save_output_fastqs ? "--classified-out ${classified}" : ""
+    def unclassified_command = save_output_fastqs ? "--unclassified-out ${unclassified}" : ""
+    def readclassification_command = save_reads_assignment ? "--output ${prefix}.kraken2.classifiedreads.txt" : ""
+    def compress_reads_command = save_output_fastqs ? "pigz -p $task.cpus *.fastq" : ""
+
     """
     kraken2 \\
         --db $db \\
         --threads $task.cpus \\
-        --unclassified-out $unclassified \\
-        --classified-out $classified \\
         --report ${prefix}.kraken2.report.txt \\
         --gzip-compressed \\
+        $unclassified_command \\
+        $classified_command \\
+        $readclassification_command \\
         $paired \\
         $args \\
         $reads
 
-    pigz -p $task.cpus *.fastq
+    $compress_reads_command
 
     cat <<-END_VERSIONS > versions.yml
     "${task.process}":
diff --git a/modules/kraken2/kraken2/meta.yml b/modules/kraken2/kraken2/meta.yml
index 9d6a3855..7129fe3a 100644
--- a/modules/kraken2/kraken2/meta.yml
+++ b/modules/kraken2/kraken2/meta.yml
@@ -27,25 +27,40 @@ input:
   - db:
       type: directory
       description: Kraken2 database
+  - save_output_fastqs:
+      type: boolean
+      description: |
+        If true, optional commands are added to save classified and unclassified reads
+        as fastq files
+  - save_reads_assignment:
+      type: boolean
+      description: |
+        If true, an optional command is added to save a file reporting the taxonomic
+        classification of each input read
 output:
   - meta:
       type: map
       description: |
         Groovy Map containing sample information
         e.g. [ id:'test', single_end:false ]
-  - classified:
+  - classified_reads_fastq:
       type: file
       description: |
-        Reads classified to belong to any of the taxa
+        Reads classified as belonging to any of the taxa
         on the Kraken2 database.
       pattern: "*{fastq.gz}"
-  - unclassified:
+  - unclassified_reads_fastq:
       type: file
       description: |
-        Reads not classified to belong to any of the taxa
+        Reads not classified to any of the taxa
         on the Kraken2 database.
       pattern: "*{fastq.gz}"
-  - txt:
+  - classified_reads_assignment:
+      type: file
+      description: |
+        Kraken2 output file indicating the taxonomic assignment of
+        each input read
+  - report:
       type: file
       description: |
         Kraken2 report containing stats about classified
diff --git a/modules/picard/collecthsmetrics/main.nf b/modules/picard/collecthsmetrics/main.nf
index 3acf8bb8..ef7a9b9f 100644
--- a/modules/picard/collecthsmetrics/main.nf
+++ b/modules/picard/collecthsmetrics/main.nf
@@ -15,8 +15,8 @@ process PICARD_COLLECTHSMETRICS {
     path target_intervals
 
     output:
-    tuple val(meta), path("*collecthsmetrics.txt"), emit: hs_metrics
-    path "versions.yml"                           , emit: versions
+    tuple val(meta), path("*_metrics")  , emit: metrics
+    path "versions.yml"                 , emit: versions
 
     when:
     task.ext.when == null || task.ext.when
@@ -41,7 +41,8 @@ process PICARD_COLLECTHSMETRICS {
         -BAIT_INTERVALS $bait_intervals \\
         -TARGET_INTERVALS $target_intervals \\
         -INPUT $bam \\
-        -OUTPUT ${prefix}_collecthsmetrics.txt
+        -OUTPUT ${prefix}.CollectHsMetrics.coverage_metrics
+
 
     cat <<-END_VERSIONS > versions.yml
     "${task.process}":
@@ -52,7 +53,7 @@ process PICARD_COLLECTHSMETRICS {
     stub:
     def prefix = task.ext.prefix ?: "${meta.id}"
     """
-    touch ${prefix}_collecthsmetrics.txt
+    touch ${prefix}.CollectHsMetrics.coverage_metrics
 
     cat <<-END_VERSIONS > versions.yml
     "${task.process}":
diff --git a/modules/picard/collecthsmetrics/meta.yml b/modules/picard/collecthsmetrics/meta.yml
index 4b94909f..dc9d647a 100644
--- a/modules/picard/collecthsmetrics/meta.yml
+++ b/modules/picard/collecthsmetrics/meta.yml
@@ -57,10 +57,11 @@ output:
       type: file
       description: File containing software versions
       pattern: "versions.yml"
-  - hs_metrics:
+  - metrics:
       type: file
-      description: The metrics file.
-      pattern: "*_collecthsmetrics.txt"
+      description: Alignment metrics files generated by picard
+      pattern: "*_{metrics}"
 
 authors:
   - "@projectoriented"
+  - "@matthdsm"
diff --git a/modules/samtools/view/main.nf b/modules/samtools/view/main.nf
index 5f14fbbf..11cfb74b 100644
--- a/modules/samtools/view/main.nf
+++ b/modules/samtools/view/main.nf
@@ -8,7 +8,7 @@ process SAMTOOLS_VIEW {
         'quay.io/biocontainers/samtools:1.15.1--h1170115_0' }"
 
     input:
-    tuple val(meta), path(input)
+    tuple val(meta), path(input), path(index)
     path fasta
 
     output:
diff --git a/modules/samtools/view/meta.yml b/modules/samtools/view/meta.yml
index 5604bfa7..a8b43ecc 100644
--- a/modules/samtools/view/meta.yml
+++ b/modules/samtools/view/meta.yml
@@ -25,6 +25,10 @@ input:
       type: file
       description: BAM/CRAM/SAM file
       pattern: "*.{bam,cram,sam}"
+  - index:
+      type: optional file
+      description: BAM.BAI/CRAM.CRAI file
+      pattern: "*.{.bai,.crai}"
   - fasta:
       type: optional file
       description: Reference file the CRAM was created with
diff --git a/modules/stranger/main.nf b/modules/stranger/main.nf
index 55678bd3..ddfa0070 100644
--- a/modules/stranger/main.nf
+++ b/modules/stranger/main.nf
@@ -33,4 +33,15 @@ process STRANGER {
         stranger: \$( stranger --version )
     END_VERSIONS
     """
+
+    stub:
+    def prefix = task.ext.prefix ?: "${meta.id}"
+    """
+    touch ${prefix}.vcf.gz
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        stranger: \$( stranger --version )
+    END_VERSIONS
+    """
 }
diff --git a/tests/config/pytest_modules.yml b/tests/config/pytest_modules.yml
index 9a128bd4..a1a969e7 100644
--- a/tests/config/pytest_modules.yml
+++ b/tests/config/pytest_modules.yml
@@ -174,6 +174,10 @@ bcftools/view:
   - modules/bcftools/view/**
   - tests/modules/bcftools/view/**
 
+bclconvert:
+  - modules/bclconvert/**
+  - tests/modules/bclconvert/**
+
 bedtools/bamtobed:
   - modules/bedtools/bamtobed/**
   - tests/modules/bedtools/bamtobed/**
@@ -595,6 +599,14 @@ ectyper:
   - modules/ectyper/**
   - tests/modules/ectyper/**
 
+elprep/filter:
+  - modules/elprep/filter/**
+  - tests/modules/elprep/filter/**
+
+elprep/split:
+  - modules/elprep/split/**
+  - tests/modules/elprep/split/**
+
 emmtyper:
   - modules/emmtyper/**
   - tests/modules/emmtyper/**
@@ -997,6 +1009,10 @@ kaiju/kaiju:
   - modules/kaiju/kaiju/**
   - tests/modules/kaiju/kaiju/**
 
+kaiju/kaiju2table:
+  - modules/kaiju/kaiju2table/**
+  - tests/modules/kaiju/kaiju2table/**
+
 kallisto/index:
   - modules/kallisto/index/**
   - tests/modules/kallisto/index/**
diff --git a/tests/config/test_data.config b/tests/config/test_data.config
index ea123732..559c0d6f 100644
--- a/tests/config/test_data.config
+++ b/tests/config/test_data.config
@@ -112,6 +112,7 @@ params {
         }
         'homo_sapiens' {
             'genome' {
+                genome_elfasta                                 = "${test_data_dir}/genomics/homo_sapiens/genome/genome.elfasta"
                 genome_fasta                                   = "${test_data_dir}/genomics/homo_sapiens/genome/genome.fasta"
                 genome_fasta_fai                               = "${test_data_dir}/genomics/homo_sapiens/genome/genome.fasta.fai"
                 genome_dict                                    = "${test_data_dir}/genomics/homo_sapiens/genome/genome.dict"
@@ -123,6 +124,7 @@ params {
                 genome_header                                  = "${test_data_dir}/genomics/homo_sapiens/genome/genome.header"
                 genome_bed_gz                                  = "${test_data_dir}/genomics/homo_sapiens/genome/genome.bed.gz"
                 genome_bed_gz_tbi                              = "${test_data_dir}/genomics/homo_sapiens/genome/genome.bed.gz.tbi"
+                genome_elsites                                 = "${test_data_dir}/genomics/homo_sapiens/genome/genome.elsites"
                 transcriptome_fasta                            = "${test_data_dir}/genomics/homo_sapiens/genome/transcriptome.fasta"
                 genome2_fasta                                  = "${test_data_dir}/genomics/homo_sapiens/genome/genome2.fasta"
                 genome_chain_gz                                = "${test_data_dir}/genomics/homo_sapiens/genome/genome.chain.gz"
@@ -136,6 +138,7 @@ params {
                 genome_21_multi_interval_bed_gz_tbi            = "${test_data_dir}/genomics/homo_sapiens/genome/chr21/sequence/multi_intervals.bed.gz.tbi"
                 genome_21_chromosomes_dir                      = "${test_data_dir}/genomics/homo_sapiens/genome/chr21/sequence/chromosomes.tar.gz"
 
+                dbsnp_146_hg38_elsites                         = "${test_data_dir}/genomics/homo_sapiens/genome/vcf/dbsnp_146.hg38.elsites"
                 dbsnp_146_hg38_vcf_gz                          = "${test_data_dir}/genomics/homo_sapiens/genome/vcf/dbsnp_146.hg38.vcf.gz"
                 dbsnp_146_hg38_vcf_gz_tbi                      = "${test_data_dir}/genomics/homo_sapiens/genome/vcf/dbsnp_146.hg38.vcf.gz.tbi"
                 gnomad_r2_1_1_vcf_gz                           = "${test_data_dir}/genomics/homo_sapiens/genome/vcf/gnomAD.r2.1.1.vcf.gz"
diff --git a/tests/modules/bclconvert/main.nf b/tests/modules/bclconvert/main.nf
new file mode 100644
index 00000000..e8a78e4f
--- /dev/null
+++ b/tests/modules/bclconvert/main.nf
@@ -0,0 +1,22 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { BCLCONVERT } from '../../../modules/bclconvert/main.nf'
+
+process STUB_BCLCONVERT_INPUT {
+    output:
+    path "SampleSheet.csv"          ,emit: samplesheet
+    path "DDMMYY_SERIAL_FLOWCELL"   ,emit: run_dir
+
+    stub:
+    """
+    mkdir DDMMYY_SERIAL_FLOWCELL
+    echo "SampleSheet" > SampleSheet.csv
+    """
+}
+
+workflow test_bclconvert {
+    STUB_BCLCONVERT_INPUT ()
+    BCLCONVERT (STUB_BCLCONVERT_INPUT.out.samplesheet, STUB_BCLCONVERT_INPUT.out.run_dir)
+}
diff --git a/tests/modules/bclconvert/nextflow.config b/tests/modules/bclconvert/nextflow.config
new file mode 100644
index 00000000..50f50a7a
--- /dev/null
+++ b/tests/modules/bclconvert/nextflow.config
@@ -0,0 +1,5 @@
+process {
+
+    publishDir = { "${params.outdir}/${task.process.tokenize(':')[-1].tokenize('_')[0].toLowerCase()}" }
+    
+}
\ No newline at end of file
diff --git a/tests/modules/bclconvert/test.yml b/tests/modules/bclconvert/test.yml
new file mode 100644
index 00000000..65e71a59
--- /dev/null
+++ b/tests/modules/bclconvert/test.yml
@@ -0,0 +1,52 @@
+- name: bclconvert test_bclconvert
+  command: nextflow run tests/modules/bclconvert -entry test_bclconvert -c tests/config/nextflow.config -stub-run
+  tags:
+    - bclconvert
+  files:
+    - path: output/bclconvert/InterOp/InterOp.bin
+      md5sum: d3dea0bb4ab1c8754af324f40b001481
+    - path: output/bclconvert/Logs/Errors.log
+      md5sum: 334645f09074b2597a692e395b716a9c
+    - path: output/bclconvert/Logs/FastqComplete.txt
+      md5sum: a4c4c6ce2d0de67d3b7ac7d1fcb512e4
+    - path: output/bclconvert/Logs/Info.log
+      md5sum: d238822d379f2277cac950ca986cb660
+    - path: output/bclconvert/Logs/Warnings.log
+      md5sum: aeefd2d631817e170f88f25ecaaf4664
+    - path: output/bclconvert/Reports/Adapter_Metrics.csv
+      md5sum: af62e9c7b44940cfd8ea11064a1f42ae
+    - path: output/bclconvert/Reports/Demultiplex_Stats.csv
+      md5sum: d11313931fcaabb5ce159462ad3dd1da
+    - path: output/bclconvert/Reports/IndexMetricsOut.bin
+      md5sum: 6bcee11c8145e3b1059ceaa91d2f5be7
+    - path: output/bclconvert/Reports/Index_Hopping_Counts.csv
+      md5sum: 697e40e0c0d48b4bd25f138ef60b0bde
+    - path: output/bclconvert/Reports/Quality_Metrics.csv
+      md5sum: 3902fd38f6b01f1ce0f0e8724238f8f2
+    - path: output/bclconvert/Reports/RunInfo.xml
+      md5sum: 5bef7c7e76360231b0c4afdfc915fd44
+    - path: output/bclconvert/Reports/SampleSheet.csv
+      md5sum: c579e7d2c9c917c4cfb875a0373c0936
+    - path: output/bclconvert/Reports/Top_Unknown_Barcodes.csv
+      md5sum: 39a5e7f6d21c12d6051afdc8261b6330
+    - path: output/bclconvert/Reports/fastq_list.csv
+      md5sum: 32c51ab10e013fd547928de57361ffcb
+    - path: output/bclconvert/sample1_S1_L001_R1_001.fastq.gz
+      md5sum: 9b831a39755935333f86f167527a094d
+    - path: output/bclconvert/sample1_S1_L001_R2_001.fastq.gz
+      md5sum: 082f4f767b7619f409ca7e752ef482bf
+    - path: output/bclconvert/sample1_S1_L002_R1_001.fastq.gz
+      md5sum: 837764c89db93dfb53cd663c4f26f3d7
+    - path: output/bclconvert/sample1_S1_L002_R2_001.fastq.gz
+      md5sum: 1a42cf6ba0bb8fc7770f278e6d1ab676
+    - path: output/bclconvert/sample2_S2_L001_R1_001.fastq.gz
+      md5sum: 475bc426b7cc48d0551d40e31457dc78
+    - path: output/bclconvert/sample2_S2_L001_R2_001.fastq.gz
+      md5sum: f670ccd7d9352e0e67fe1c1232429d94
+    - path: output/bclconvert/sample2_S2_L002_R1_001.fastq.gz
+      md5sum: ebd5ff6fa5603e7d704b5a10598de58c
+    - path: output/bclconvert/sample2_S2_L002_R2_001.fastq.gz
+      md5sum: 2f83b460f52620d2548c7ef8845b31d7
+    - path: output/stub/SampleSheet.csv
+      md5sum: c579e7d2c9c917c4cfb875a0373c0936
+    - path: output/bclconvert/versions.yml
diff --git a/tests/modules/elprep/filter/main.nf b/tests/modules/elprep/filter/main.nf
new file mode 100644
index 00000000..0a8d43ca
--- /dev/null
+++ b/tests/modules/elprep/filter/main.nf
@@ -0,0 +1,18 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { ELPREP_FILTER } from '../../../../modules/elprep/filter/main.nf'
+
+workflow test_elprep_filter {
+
+    input = [
+        [ id:'test', single_end:false ], // meta map
+        file(params.test_data['homo_sapiens']['illumina']['test_paired_end_sorted_bam'], checkIfExists: true)
+    ]
+    reference_elfasta = file(params.test_data['homo_sapiens']['genome']['genome_elfasta'], checkIfExists: true)
+    known_sites_elsites = file(params.test_data['homo_sapiens']['genome']['dbsnp_146_hg38_elsites'], checkIfExists: true)
+    target_regions_bed = file(params.test_data['homo_sapiens']['genome']['genome_bed'], checkIfExists: true)
+
+    ELPREP_FILTER ( input, true, true, [],  [], reference_elfasta, known_sites_elsites, target_regions_bed, [], [], true, true)
+}
diff --git a/tests/modules/elprep/filter/nextflow.config b/tests/modules/elprep/filter/nextflow.config
new file mode 100644
index 00000000..d53a3d2d
--- /dev/null
+++ b/tests/modules/elprep/filter/nextflow.config
@@ -0,0 +1,7 @@
+process {
+
+    publishDir = { "${params.outdir}/${task.process.tokenize(':')[-1].tokenize('_')[0].toLowerCase()}" }
+    withName: ELPREP_FILTER {
+        ext.args = "--mark-duplicates "
+    }
+}
diff --git a/tests/modules/elprep/filter/test.yml b/tests/modules/elprep/filter/test.yml
new file mode 100644
index 00000000..922d7a9b
--- /dev/null
+++ b/tests/modules/elprep/filter/test.yml
@@ -0,0 +1,13 @@
+- name: elprep filter test_elprep_filter
+  command: nextflow run tests/modules/elprep/filter -entry test_elprep_filter -c tests/config/nextflow.config
+  tags:
+    - elprep
+    - elprep/filter
+  files:
+    - path: output/elprep/test.activity_profile.igv
+    - path: output/elprep/test.assembly_regions.igv
+    - path: output/elprep/output/test.bam
+    - path: output/elprep/test.g.vcf.gz
+    - path: output/elprep/test.metrics.txt
+    - path: output/elprep/test.recall
+    - path: output/elprep/versions.yml
diff --git a/tests/modules/elprep/split/main.nf b/tests/modules/elprep/split/main.nf
new file mode 100644
index 00000000..d5a111de
--- /dev/null
+++ b/tests/modules/elprep/split/main.nf
@@ -0,0 +1,15 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { ELPREP_SPLIT } from '../../../../modules/elprep/split/main.nf'
+
+workflow test_elprep_split {
+
+    input = [
+        [ id:'test', single_end:false ], // meta map
+        file(params.test_data['homo_sapiens']['illumina']['test_paired_end_sorted_bam'], checkIfExists: true)
+    ]
+
+    ELPREP_SPLIT ( input )
+}
diff --git a/tests/modules/elprep/split/nextflow.config b/tests/modules/elprep/split/nextflow.config
new file mode 100644
index 00000000..a3ae0169
--- /dev/null
+++ b/tests/modules/elprep/split/nextflow.config
@@ -0,0 +1,9 @@
+process {
+
+    publishDir = { "${params.outdir}/${task.process.tokenize(':')[-1].tokenize('_')[0].toLowerCase()}" }
+
+    withName : ELPREP_SPLIT {
+        ext.args = "--contig-group-size 1 --output-type bam"
+    }
+
+}
diff --git a/tests/modules/elprep/split/test.yml b/tests/modules/elprep/split/test.yml
new file mode 100644
index 00000000..2de3f99b
--- /dev/null
+++ b/tests/modules/elprep/split/test.yml
@@ -0,0 +1,10 @@
+- name: elprep split test_elprep_split
+  command: nextflow run tests/modules/elprep/split -entry test_elprep_split -c tests/config/nextflow.config
+  tags:
+    - elprep
+    - elprep/split
+  files:
+    - path: output/elprep/output/splits/test-group00001.bam
+    - path: output/elprep/output/splits/test-unmapped.bam
+    - path: output/elprep/output/test-spread.bam
+    - path: output/elprep/versions.yml
diff --git a/tests/modules/kaiju/kaiju2table/main.nf b/tests/modules/kaiju/kaiju2table/main.nf
new file mode 100644
index 00000000..b7169ba5
--- /dev/null
+++ b/tests/modules/kaiju/kaiju2table/main.nf
@@ -0,0 +1,21 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { UNTAR             } from '../../../../modules/untar/main.nf'
+include { KAIJU_KAIJU       } from '../../../../modules/kaiju/kaiju/main.nf'
+include { KAIJU_KAIJU2TABLE } from '../../../../modules/kaiju/kaiju2table/main.nf'
+
+workflow test_kaiju_kaiju_single_end {
+
+    input = [
+        [ id:'test', single_end:true ], // meta map
+        file(params.test_data['sarscov2']['illumina']['test_1_fastq_gz'], checkIfExists: true)
+    ]
+    db    = [ [], file(params.test_data['sarscov2']['genome']['kaiju_tar_gz'], checkIfExists: true) ]
+    taxon_rank = "species"
+
+    ch_db = UNTAR ( db )
+    KAIJU_KAIJU ( input, ch_db.untar.map{ it[1] } )
+    KAIJU_KAIJU2TABLE ( KAIJU_KAIJU.out.results, ch_db.untar.map{ it[1] }, taxon_rank )
+}
diff --git a/tests/modules/kaiju/kaiju2table/nextflow.config b/tests/modules/kaiju/kaiju2table/nextflow.config
new file mode 100644
index 00000000..50f50a7a
--- /dev/null
+++ b/tests/modules/kaiju/kaiju2table/nextflow.config
@@ -0,0 +1,5 @@
+process {
+
+    publishDir = { "${params.outdir}/${task.process.tokenize(':')[-1].tokenize('_')[0].toLowerCase()}" }
+    
+}
\ No newline at end of file
diff --git a/tests/modules/kaiju/kaiju2table/test.yml b/tests/modules/kaiju/kaiju2table/test.yml
new file mode 100644
index 00000000..47d99c89
--- /dev/null
+++ b/tests/modules/kaiju/kaiju2table/test.yml
@@ -0,0 +1,9 @@
+- name: kaiju kaiju2table test_kaiju_kaiju_single_end
+  command: nextflow run tests/modules/kaiju/kaiju2table -entry test_kaiju_kaiju_single_end -c tests/config/nextflow.config
+  tags:
+    - kaiju
+    - kaiju/kaiju2table
+  files:
+    - path: output/kaiju/test.txt
+      md5sum: 0d9f8fd36fcf2888296ae12632c5f0a8
+    - path: output/kaiju/versions.yml
diff --git a/tests/modules/kraken2/kraken2/main.nf b/tests/modules/kraken2/kraken2/main.nf
index 94f4db95..4a3593e4 100644
--- a/tests/modules/kraken2/kraken2/main.nf
+++ b/tests/modules/kraken2/kraken2/main.nf
@@ -12,7 +12,7 @@ workflow test_kraken2_kraken2_single_end {
     db    = [ [], file(params.test_data['sarscov2']['genome']['kraken2_tar_gz'], checkIfExists: true) ]
 
     UNTAR ( db )
-    KRAKEN2_KRAKEN2 ( input, UNTAR.out.untar.map{ it[1] } )
+    KRAKEN2_KRAKEN2 ( input, UNTAR.out.untar.map{ it[1] }, true, false )
 }
 
 workflow test_kraken2_kraken2_paired_end {
@@ -23,5 +23,15 @@ workflow test_kraken2_kraken2_paired_end {
     db    = [ [], file(params.test_data['sarscov2']['genome']['kraken2_tar_gz'], checkIfExists: true) ]
 
     UNTAR ( db )
-    KRAKEN2_KRAKEN2 ( input, UNTAR.out.untar.map{ it[1] } )
+    KRAKEN2_KRAKEN2 ( input, UNTAR.out.untar.map{ it[1] }, true, false )
+}
+
+workflow test_kraken2_kraken2_classifyreads {
+    input = [ [ id:'test', single_end:true ], // meta map
+              [ file(params.test_data['sarscov2']['illumina']['test_1_fastq_gz'], checkIfExists: true) ]
+            ]
+    db    = [ [], file(params.test_data['sarscov2']['genome']['kraken2_tar_gz'], checkIfExists: true) ]
+
+    UNTAR ( db )
+    KRAKEN2_KRAKEN2 ( input, UNTAR.out.untar.map{ it[1] }, false, true )
 }
diff --git a/tests/modules/kraken2/kraken2/test.yml b/tests/modules/kraken2/kraken2/test.yml
index 1ec413bf..af1e6e0d 100644
--- a/tests/modules/kraken2/kraken2/test.yml
+++ b/tests/modules/kraken2/kraken2/test.yml
@@ -1,29 +1,43 @@
-- name: kraken2 kraken2 single-end
-  command: nextflow run ./tests/modules/kraken2/kraken2 -entry test_kraken2_kraken2_single_end -c ./tests/config/nextflow.config -c ./tests/modules/kraken2/kraken2/nextflow.config
+- name: kraken2 kraken2 test_kraken2_kraken2_single_end
+  command: nextflow run tests/modules/kraken2/kraken2 -entry test_kraken2_kraken2_single_end -c tests/config/nextflow.config
   tags:
     - kraken2
     - kraken2/kraken2
   files:
     - path: output/kraken2/test.classified.fastq.gz
-      should_exist: true
-    - path: output/kraken2/test.unclassified.fastq.gz
-      should_exist: true
     - path: output/kraken2/test.kraken2.report.txt
       md5sum: 4227755fe40478b8d7dc8634b489761e
+    - path: output/kraken2/test.unclassified.fastq.gz
+    - path: output/kraken2/versions.yml
+      md5sum: 6e3ad947ac8dee841a89216071c181cc
+    - path: output/untar/versions.yml
 
-- name: kraken2 kraken2 paired-end
-  command: nextflow run ./tests/modules/kraken2/kraken2 -entry test_kraken2_kraken2_paired_end -c ./tests/config/nextflow.config -c ./tests/modules/kraken2/kraken2/nextflow.config
+- name: kraken2 kraken2 test_kraken2_kraken2_paired_end
+  command: nextflow run tests/modules/kraken2/kraken2 -entry test_kraken2_kraken2_paired_end -c tests/config/nextflow.config
   tags:
     - kraken2
     - kraken2/kraken2
   files:
     - path: output/kraken2/test.classified_1.fastq.gz
-      should_exist: true
     - path: output/kraken2/test.classified_2.fastq.gz
-      should_exist: true
-    - path: output/kraken2/test.unclassified_1.fastq.gz
-      should_exist: true
-    - path: output/kraken2/test.unclassified_2.fastq.gz
-      should_exist: true
     - path: output/kraken2/test.kraken2.report.txt
       md5sum: 4227755fe40478b8d7dc8634b489761e
+    - path: output/kraken2/test.unclassified_1.fastq.gz
+    - path: output/kraken2/test.unclassified_2.fastq.gz
+    - path: output/kraken2/versions.yml
+      md5sum: 604482fe7a4519f890fae9c8beb1bd6e
+    - path: output/untar/versions.yml
+
+- name: kraken2 kraken2 test_kraken2_kraken2_classifyreads
+  command: nextflow run tests/modules/kraken2/kraken2 -entry test_kraken2_kraken2_classifyreads -c tests/config/nextflow.config
+  tags:
+    - kraken2
+    - kraken2/kraken2
+  files:
+    - path: output/kraken2/test.kraken2.classifiedreads.txt
+      md5sum: e7a90531f0d8d777316515c36fe4cae0
+    - path: output/kraken2/test.kraken2.report.txt
+      md5sum: 4227755fe40478b8d7dc8634b489761e
+    - path: output/kraken2/versions.yml
+      md5sum: 3488c304259e83c5bea573403293fce9
+    - path: output/untar/versions.yml
diff --git a/tests/modules/picard/collecthsmetrics/main.nf b/tests/modules/picard/collecthsmetrics/main.nf
index 2e8727b5..a28eb174 100644
--- a/tests/modules/picard/collecthsmetrics/main.nf
+++ b/tests/modules/picard/collecthsmetrics/main.nf
@@ -7,7 +7,7 @@ include { PICARD_COLLECTHSMETRICS } from '../../../../modules/picard/collecthsme
 workflow test_picard_collecthsmetrics {
 
     input = [ [ id:'test', single_end:false ], // meta map
-              file(params.test_data['sarscov2']['illumina']['test_paired_end_bam'], checkIfExists: true) ]
+            file(params.test_data['sarscov2']['illumina']['test_paired_end_bam'], checkIfExists: true) ]
 
     fasta = file(params.test_data['sarscov2']['genome']['genome_fasta'], checkIfExists: true)
     fai = file(params.test_data['sarscov2']['genome']['genome_fasta_fai'], checkIfExists: true)
diff --git a/tests/modules/picard/collecthsmetrics/test.yml b/tests/modules/picard/collecthsmetrics/test.yml
index 9232d508..9aa14f15 100644
--- a/tests/modules/picard/collecthsmetrics/test.yml
+++ b/tests/modules/picard/collecthsmetrics/test.yml
@@ -5,4 +5,4 @@
     - picard/collecthsmetrics
   files:
     # The file can't be md5'd consistently
-    - path: output/picard/test_collecthsmetrics.txt
+    - path: output/picard/test.CollectHsMetrics.coverage_metrics
diff --git a/tests/modules/samtools/view/main.nf b/tests/modules/samtools/view/main.nf
index 8ee27ef8..9c239066 100644
--- a/tests/modules/samtools/view/main.nf
+++ b/tests/modules/samtools/view/main.nf
@@ -6,7 +6,8 @@ include { SAMTOOLS_VIEW } from '../../../../modules/samtools/view/main.nf'
 
 workflow test_samtools_view {
     input = [ [ id:'test', single_end:false ], // meta map
-                file(params.test_data['sarscov2']['illumina']['test_paired_end_bam'], checkIfExists: true)
+                file(params.test_data['sarscov2']['illumina']['test_paired_end_bam'], checkIfExists: true),
+                []
             ]
 
     SAMTOOLS_VIEW ( input, [] )
@@ -14,8 +15,8 @@ workflow test_samtools_view {
 
 workflow test_samtools_view_cram {
    input = [ [ id: 'test' ], // meta map
-               file(params.test_data['homo_sapiens']['illumina']['test_paired_end_recalibrated_sorted_cram'], checkIfExists: true),
-               file(params.test_data['homo_sapiens']['illumina']['test_paired_end_recalibrated_sorted_cram_crai'], checkIfExists: true)
+                file(params.test_data['homo_sapiens']['illumina']['test_paired_end_recalibrated_sorted_cram'], checkIfExists: true),
+                file(params.test_data['homo_sapiens']['illumina']['test_paired_end_recalibrated_sorted_cram_crai'], checkIfExists: true)
             ]
     fasta   = file(params.test_data['homo_sapiens']['genome']['genome_fasta'], checkIfExists: true)
 
diff --git a/tests/modules/stranger/main.nf b/tests/modules/stranger/main.nf
index 5bd6766b..4a930c19 100644
--- a/tests/modules/stranger/main.nf
+++ b/tests/modules/stranger/main.nf
@@ -23,3 +23,8 @@ workflow test_stranger_without_optional_variant_catalog {
     EXPANSIONHUNTER ( input, fasta, variant_catalog )
     STRANGER ( EXPANSIONHUNTER.out.vcf, [] )
 }
+
+workflow test_stranger_without_optional_variant_catalog_stubs {
+    EXPANSIONHUNTER ( input, fasta, variant_catalog )
+    STRANGER ( EXPANSIONHUNTER.out.vcf, [] )
+}
diff --git a/tests/modules/stranger/test.yml b/tests/modules/stranger/test.yml
index c7a6972e..bf922c86 100644
--- a/tests/modules/stranger/test.yml
+++ b/tests/modules/stranger/test.yml
@@ -25,3 +25,13 @@
       md5sum: bbe15159195681d5c18596d3ad85c78f
     - path: output/stranger/versions.yml
       md5sum: 8558542a007e90ea5dcdceed3f12585d
+
+- name: stranger test_stranger_without_optional_variant_catalog_stubs
+  command: nextflow run tests/modules/stranger -entry test_stranger_without_optional_variant_catalog -c tests/config/nextflow.config -stub-run
+  tags:
+    - stranger
+  files:
+    - path: output/expansionhunter/test.vcf
+    - path: output/expansionhunter/versions.yml
+    - path: output/stranger/test.vcf.gz
+    - path: output/stranger/versions.yml