Subworkflow Infrastructure (#662)

* feat(subworkflows): Add align_bowtie2 subworkflow

For testing CI setup

* test(align_bowtie2): Add initial list of changes to test

* test(align_bowtie2): Add initial test

* refactor: Use tags to run subworkflows ci

For every underlying module used by workflow and allow the modules
pytest-modules definition be the source of truth.

* refactor: Use individual directories for subworkflows

* docs(align_bowtie2): Add initial meta.yml

Copied most of it from the bowtie2/align module.

* fix(align_bowtie2): Fix module include paths

* test(bam_sort_samtools): Add initial test

* ci(bam_sort_samtools): Add modules that trigger the tag

* test(bam_stats_samtools): Add initial test

* ci(bam_stats_samtools): Add keys to pick up changes

* docs(bam_samtools): Add initial meta.yml

* test(align_bowtie2): Fix path to subworkflow

* test(align_bowtie2): Update entry point

* fix(bam_sort_samtools): Update include paths

* test(bam_sort_samtools): Fix path

* style: Clean up addParams

* test(samtools_sort): Add suffix for test

* test(align_bowtie2): Add samtools_options for suffix

* test(bam_stats_samtools): Update path

* test(bam_stats_samtools): Use stats input

Otherwise it's just an example of how it's used in the bam_sort_samtools subworkflow

* ci(linting): Skip module linting of subworkflows

* ci(linting): Clean up startsWith statement

* test(bam_stats_samtools): Use single end test data for single end test

* test(bam_stats_samtools): Add expected files

* test(align_bowtie2): Add paired-end test

* test(align_bowtie2): Sort order of output

* test(align_bowtie2): Update hashes

* docs(align_bowtie2): Fix typo

* test(align_bowtie2): Update samtools output names

* test(align_bowtie2): Remove md5sums for bam/bai

* feat(subworkflows): Add nextflow.configs

These can be used for default settings in the future. They can then be
included in the conf/modules.config so that the params don't have to be
duplicated in the root nextflow.config.

* docs(subworkflows): Include modules instead of tools

* fix: Update to versions

* chore(align_bowtie2): Remove duplicate tag

* style: Format yamls

* test(subworkflows): Only check versions for modules

* chore: Update subworkflows to match rnaseq dev

* fix(subworkflows): Update paths

* fix(bam_sort_samtools): Fix sort parameters for testing

* Apply suggestions from code review

Co-authored-by: Harshil Patel <drpatelh@users.noreply.github.com>

* docs: Update TODOs with a message

* ci: Try using a matrix for strategy

* ci: Try passing an array

* Revert "ci: Try passing an array"

This reverts commit d3611fcd8332bbb9a8501e8dd299d0a623aaecaa.

Co-authored-by: Harshil Patel <drpatelh@users.noreply.github.com>

.github/workflows/nf-core-linting.yml

@@ -71,6 +71,8 @@ jobs:
 
       - name: Lint ${{ matrix.tags }}
         run: nf-core modules lint ${{ matrix.tags }}
+        # HACK
+        if: startsWith( matrix.tags, 'subworkflow' ) != true
 
       - uses: actions/cache@v2
         with:

.github/workflows/pytest-workflow.yml

@@ -9,6 +9,11 @@ jobs:
   changes:
     name: Check for changes
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        filter:
+          ["tests/config/pytest_modules.yml", "tests/config/pytest_subworkflows.yml"]
     outputs:
       # Expose matched filters as job 'modules' output variable
       modules: ${{ steps.filter.outputs.changes }}
@@ -18,7 +23,7 @@ jobs:
       - uses: dorny/paths-filter@v2
         id: filter
         with:
-          filters: "tests/config/pytest_modules.yml"
+          filters: ${{ matrix.filter }}
 
   test:
     runs-on: ubuntu-20.04

subworkflows/nf-core/align_bowtie2/main.nf

@@ -0,0 +1,47 @@
+//
+// Alignment with Bowtie2
+//
+
+params.align_options          = [:]
+params.samtools_sort_options  = [:]
+params.samtools_index_options = [:]
+params.samtools_stats_options = [:]
+
+include { BOWTIE2_ALIGN     } from '../../../modules/bowtie2/align/main' addParams( options: params.align_options    )
+include { BAM_SORT_SAMTOOLS } from '../bam_sort_samtools/main'           addParams( sort_options: params.samtools_sort_options, index_options: params.samtools_index_options, stats_options: params.samtools_stats_options )
+
+workflow ALIGN_BOWTIE2 {
+    take:
+    reads // channel: [ val(meta), [ reads ] ]
+    index // channel: /path/to/bowtie2/index/
+
+    main:
+
+    ch_versions = Channel.empty()
+
+    //
+    // Map reads with Bowtie2
+    //
+    BOWTIE2_ALIGN ( reads, index )
+    ch_versions = ch_versions.mix(BOWTIE2_ALIGN.out.versions.first())
+
+    //
+    // Sort, index BAM file and run samtools stats, flagstat and idxstats
+    //
+    BAM_SORT_SAMTOOLS ( BOWTIE2_ALIGN.out.bam )
+    ch_versions = ch_versions.mix(BAM_SORT_SAMTOOLS.out.versions)
+
+    emit:
+    bam_orig          = BOWTIE2_ALIGN.out.bam          // channel: [ val(meta), bam   ]
+    log_out           = BOWTIE2_ALIGN.out.log          // channel: [ val(meta), log   ]
+    fastq             = BOWTIE2_ALIGN.out.fastq        // channel: [ val(meta), fastq ]
+
+    bam              = BAM_SORT_SAMTOOLS.out.bam      // channel: [ val(meta), [ bam ] ]
+    bai              = BAM_SORT_SAMTOOLS.out.bai      // channel: [ val(meta), [ bai ] ]
+    csi              = BAM_SORT_SAMTOOLS.out.csi      // channel: [ val(meta), [ csi ] ]
+    stats            = BAM_SORT_SAMTOOLS.out.stats    // channel: [ val(meta), [ stats ] ]
+    flagstat         = BAM_SORT_SAMTOOLS.out.flagstat // channel: [ val(meta), [ flagstat ] ]
+    idxstats         = BAM_SORT_SAMTOOLS.out.idxstats // channel: [ val(meta), [ idxstats ] ]
+
+    versions       = ch_versions                      // channel: [ versions.yml ]
+}

subworkflows/nf-core/align_bowtie2/meta.yml

@@ -0,0 +1,50 @@
+name: align_bowtie2
+description: Align reads to a reference genome using bowtie2 then sort with samtools
+keywords:
+  - align
+  - fasta
+  - genome
+  - reference
+modules:
+  - bowtie2/align
+  - samtools/sort
+  - samtools/index
+  - samtools/stats
+  - samtools/idxstats
+  - samtools/flagstat
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - reads:
+      type: file
+      description: |
+        List of input FastQ files of size 1 and 2 for single-end and paired-end data,
+        respectively.
+  - index:
+      type: file
+      description: Bowtie2 genome index files
+      pattern: '*.ebwt'
+# TODO Update when we decide on a standard for subworkflow docs
+output:
+  - bam:
+      type: file
+      description: Output BAM file containing read alignments
+      pattern: '*.{bam}'
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: 'versions.yml'
+  - fastq:
+      type: file
+      description: Unaligned FastQ files
+      pattern: '*.fastq.gz'
+  - log:
+      type: file
+      description: Alignment log
+      pattern: '*.log'
+  # TODO Add samtools outputs
+authors:
+  - '@drpatelh'

subworkflows/nf-core/align_bowtie2/nextflow.config

@@ -0,0 +1,2 @@
+params.align_options    = [:]
+params.samtools_options = [:]

subworkflows/nf-core/bam_sort_samtools/main.nf

@@ -0,0 +1,53 @@
+//
+// Sort, index BAM file and run samtools stats, flagstat and idxstats
+//
+
+params.sort_options  = [:]
+params.index_options = [:]
+params.stats_options = [:]
+
+include { SAMTOOLS_SORT      } from '../../../modules/samtools/sort/main'  addParams( options: params.sort_options  )
+include { SAMTOOLS_INDEX     } from '../../../modules/samtools/index/main' addParams( options: params.index_options )
+include { BAM_STATS_SAMTOOLS } from '../bam_stats_samtools/main'           addParams( options: params.stats_options )
+
+workflow BAM_SORT_SAMTOOLS {
+    take:
+    ch_bam // channel: [ val(meta), [ bam ] ]
+
+    main:
+
+    ch_versions = Channel.empty()
+
+    SAMTOOLS_SORT ( ch_bam )
+    ch_versions = ch_versions.mix(SAMTOOLS_SORT.out.versions.first())
+
+    SAMTOOLS_INDEX ( SAMTOOLS_SORT.out.bam )
+    ch_versions = ch_versions.mix(SAMTOOLS_INDEX.out.versions.first())
+
+    SAMTOOLS_SORT.out.bam
+        .join(SAMTOOLS_INDEX.out.bai, by: [0], remainder: true)
+        .join(SAMTOOLS_INDEX.out.csi, by: [0], remainder: true)
+        .map {
+            meta, bam, bai, csi ->
+                if (bai) {
+                    [ meta, bam, bai ]
+                } else {
+                    [ meta, bam, csi ]
+                }
+        }
+        .set { ch_bam_bai }
+
+    BAM_STATS_SAMTOOLS ( ch_bam_bai )
+    ch_versions = ch_versions.mix(BAM_STATS_SAMTOOLS.out.versions)
+
+    emit:
+    bam      = SAMTOOLS_SORT.out.bam           // channel: [ val(meta), [ bam ] ]
+    bai      = SAMTOOLS_INDEX.out.bai          // channel: [ val(meta), [ bai ] ]
+    csi      = SAMTOOLS_INDEX.out.csi          // channel: [ val(meta), [ csi ] ]
+
+    stats    = BAM_STATS_SAMTOOLS.out.stats    // channel: [ val(meta), [ stats ] ]
+    flagstat = BAM_STATS_SAMTOOLS.out.flagstat // channel: [ val(meta), [ flagstat ] ]
+    idxstats = BAM_STATS_SAMTOOLS.out.idxstats // channel: [ val(meta), [ idxstats ] ]
+
+    versions = ch_versions                     // channel: [ versions.yml ]
+}

subworkflows/nf-core/bam_sort_samtools/meta.yml

@@ -0,0 +1,41 @@
+name: bam_sort_samtools
+description: Sort SAM/BAM/CRAM file
+keywords:
+  - sort
+  - bam
+  - sam
+  - cram
+modules:
+  - samtools/sort
+  - samtools/index
+  - samtools/stats
+  - samtools/idxstats
+  - samtools/flagstat
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - bam:
+      type: file
+      description: BAM/CRAM/SAM file
+      pattern: '*.{bam,cram,sam}'
+# TODO Update when we decide on a standard for subworkflow docs
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - bam:
+      type: file
+      description: Sorted BAM/CRAM/SAM file
+      pattern: '*.{bam,cram,sam}'
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: 'versions.yml'
+authors:
+  - '@drpatelh'
+  - '@ewels'

subworkflows/nf-core/bam_sort_samtools/nextflow.config

@@ -0,0 +1 @@
+params.options = [:]

subworkflows/nf-core/bam_stats_samtools/main.nf

@@ -0,0 +1,33 @@
+//
+// Run SAMtools stats, flagstat and idxstats
+//
+
+params.options = [:]
+
+include { SAMTOOLS_STATS    } from '../../../modules/samtools/stats/main'    addParams( options: params.options )
+include { SAMTOOLS_IDXSTATS } from '../../../modules/samtools/idxstats/main' addParams( options: params.options )
+include { SAMTOOLS_FLAGSTAT } from '../../../modules/samtools/flagstat/main' addParams( options: params.options )
+
+workflow BAM_STATS_SAMTOOLS {
+    take:
+    ch_bam_bai // channel: [ val(meta), [ bam ], [bai/csi] ]
+
+    main:
+    ch_versions = Channel.empty()
+
+    SAMTOOLS_STATS ( ch_bam_bai )
+    ch_versions = ch_versions.mix(SAMTOOLS_STATS.out.versions.first())
+
+    SAMTOOLS_FLAGSTAT ( ch_bam_bai )
+    ch_versions = ch_versions.mix(SAMTOOLS_FLAGSTAT.out.versions.first())
+
+    SAMTOOLS_IDXSTATS ( ch_bam_bai )
+    ch_versions = ch_versions.mix(SAMTOOLS_IDXSTATS.out.versions.first())
+
+    emit:
+    stats    = SAMTOOLS_STATS.out.stats       // channel: [ val(meta), [ stats ] ]
+    flagstat = SAMTOOLS_FLAGSTAT.out.flagstat // channel: [ val(meta), [ flagstat ] ]
+    idxstats = SAMTOOLS_IDXSTATS.out.idxstats // channel: [ val(meta), [ idxstats ] ]
+
+    versions = ch_versions                    // channel: [ versions.yml ]
+}

subworkflows/nf-core/bam_stats_samtools/meta.yml

@@ -0,0 +1,43 @@
+name: samtools_stats
+description: Produces comprehensive statistics from SAM/BAM/CRAM file
+keywords:
+  - statistics
+  - counts
+  - bam
+  - sam
+  - cram
+modules:
+  - samtools/stats
+  - samtools/idxstats
+  - samtools/flagstat
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - bam:
+      type: file
+      description: BAM/CRAM/SAM file
+      pattern: '*.{bam,cram,sam}'
+  - bai:
+      type: file
+      description: Index for BAM/CRAM/SAM file
+      pattern: '*.{bai,crai,sai}'
+# TODO Update when we decide on a standard for subworkflow docs
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - stats:
+      type: file
+      description: File containing samtools stats output
+      pattern: '*.{stats}'
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: 'versions.yml'
+authors:
+  - '@drpatelh'

subworkflows/nf-core/bam_stats_samtools/nextflow.config

@@ -0,0 +1 @@
+params.options = [:]

tests/config/pytest_subworkflows.yml

@@ -0,0 +1,11 @@
+subworkflows/align_bowtie2:
+  - subworkflows/nf-core/align_bowtie2/**
+  - tests/subworkflows/nf-core/align_bowtie2/**
+
+subworkflows/bam_stats_samtools:
+  - subworkflows/nf-core/bam_stats_samtools/**
+  - tests/subworkflows/nf-core/bam_stats_samtools/**
+
+subworkflows/bam_sort_samtools:
+  - subworkflows/nf-core/bam_sort_samtools/**
+  - tests/subworkflows/nf-core/bam_sort_samtools/**

tests/modules/samtools/sort/main.nf

@@ -2,7 +2,7 @@
 
 nextflow.enable.dsl = 2
 
-include { SAMTOOLS_SORT } from '../../../../modules/samtools/sort/main.nf' addParams( options: [:] )
+include { SAMTOOLS_SORT } from '../../../../modules/samtools/sort/main.nf' addParams( options: ['suffix': '.sorted'] )
 
 workflow test_samtools_sort  {
     input = [ [ id:'test', single_end:false ], // meta map

tests/modules/samtools/sort/test.yml

@@ -4,5 +4,5 @@
     - samtools
     - samtools/sort
   files:
-    - path: output/samtools/test.bam
+    - path: output/samtools/test.sorted.bam
-      md5sum: bdc2d9e3f579f84df1e242207b627f89
+      md5sum: bbb2db225f140e69a4ac577f74ccc90f

tests/subworkflows/nf-core/align_bowtie2/main.nf

@@ -0,0 +1,27 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { BOWTIE2_BUILD } from '../../../../modules/bowtie2/build/main.nf' addParams( options: [:] )
+include { ALIGN_BOWTIE2 } from '../../../../subworkflows/nf-core/align_bowtie2/main.nf' addParams( 'samtools_sort_options': ['suffix': '.sorted'] )
+
+workflow test_align_bowtie2_single_end {
+    input = [ [ id:'test', single_end:true ], // meta map
+              [ file(params.test_data['sarscov2']['illumina']['test_1_fastq_gz'], checkIfExists: true) ]
+            ]
+    fasta = file(params.test_data['sarscov2']['genome']['genome_fasta'], checkIfExists: true)
+
+    BOWTIE2_BUILD ( fasta )
+    ALIGN_BOWTIE2 ( input, BOWTIE2_BUILD.out.index )
+}
+
+workflow test_align_bowtie2_paired_end {
+    input = [ [ id:'test', single_end:false ], // meta map
+              [ file(params.test_data['sarscov2']['illumina']['test_1_fastq_gz'], checkIfExists: true),
+                file(params.test_data['sarscov2']['illumina']['test_2_fastq_gz'], checkIfExists: true) ]
+            ]
+    fasta = file(params.test_data['sarscov2']['genome']['genome_fasta'], checkIfExists: true)
+
+    BOWTIE2_BUILD ( fasta )
+    ALIGN_BOWTIE2 ( input, BOWTIE2_BUILD.out.index )
+}

tests/subworkflows/nf-core/align_bowtie2/test.yml

@@ -0,0 +1,81 @@
+- name: align bowtie2 single-end
+  command: nextflow run ./tests/subworkflows/nf-core/align_bowtie2 -entry test_align_bowtie2_single_end -c tests/config/nextflow.config
+  tags:
+    - subworkflows/align_bowtie2
+    - subworkflows/bam_sort_samtools
+    - subworkflows/bam_stats_samtools
+    # Modules
+    - bowtie2
+    - bowtie2/align
+    - samtools
+    - samtools/index
+    - samtools/sort
+    - samtools/stats
+    - samtools/idxstats
+    - samtools/flagstat
+  files:
+    - path: ./output/bowtie2/test.bam
+    - path: ./output/bowtie2/test.bowtie2.log
+    - path: ./output/index/bowtie2/genome.1.bt2
+      md5sum: cbe3d0bbea55bc57c99b4bfa25b5fbdf
+    - path: ./output/index/bowtie2/genome.2.bt2
+      md5sum: 47b153cd1319abc88dda532462651fcf
+    - path: ./output/index/bowtie2/genome.3.bt2
+      md5sum: 4ed93abba181d8dfab2e303e33114777
+    - path: ./output/index/bowtie2/genome.4.bt2
+      md5sum: c25be5f8b0378abf7a58c8a880b87626
+    - path: ./output/index/bowtie2/genome.rev.1.bt2
+      md5sum: 52be6950579598a990570fbcf5372184
+    - path: ./output/index/bowtie2/genome.rev.2.bt2
+      md5sum: e3b4ef343dea4dd571642010a7d09597
+      # samtools sort
+    - path: ./output/samtools/test.sorted.bam
+    - path: ./output/samtools/test.sorted.bam.bai
+      # samtools stats
+    - path: ./output/samtools/test.sorted.bam.flagstat
+      md5sum: e9ce9093133116bc54fd335cfe698372
+    - path: ./output/samtools/test.sorted.bam.idxstats
+      md5sum: e16eb632f7f462514b0873c7ac8ac905
+    - path: ./output/samtools/test.sorted.bam.stats
+      md5sum: 2d837cd72432cd856fca70d33f02ffb5
+
+- name: align bowtie2 paired-end
+  command: nextflow run ./tests/subworkflows/nf-core/align_bowtie2 -entry test_align_bowtie2_paired_end -c tests/config/nextflow.config
+  tags:
+    - subworkflows/align_bowtie2
+    - subworkflows/bam_sort_samtools
+    - subworkflows/bam_stats_samtools
+    # Modules
+    - bowtie2
+    - bowtie2/align
+    - samtools
+    - samtools/index
+    - samtools/sort
+    - samtools/stats
+    - samtools/idxstats
+    - samtools/flagstat
+  files:
+    - path: ./output/bowtie2/test.bam
+    - path: ./output/bowtie2/test.bowtie2.log
+    - path: ./output/index/bowtie2/genome.1.bt2
+      md5sum: cbe3d0bbea55bc57c99b4bfa25b5fbdf
+    - path: ./output/index/bowtie2/genome.2.bt2
+      md5sum: 47b153cd1319abc88dda532462651fcf
+    - path: ./output/index/bowtie2/genome.3.bt2
+      md5sum: 4ed93abba181d8dfab2e303e33114777
+    - path: ./output/index/bowtie2/genome.4.bt2
+      md5sum: c25be5f8b0378abf7a58c8a880b87626
+    - path: ./output/index/bowtie2/genome.rev.1.bt2
+      md5sum: 52be6950579598a990570fbcf5372184
+    - path: ./output/index/bowtie2/genome.rev.2.bt2
+      md5sum: e3b4ef343dea4dd571642010a7d09597
+      # samtools sort
+    - path: ./output/samtools/test.sorted.bam
+    - path: ./output/samtools/test.sorted.bam.bai
+      # samtools stats
+    - path: ./output/samtools/test.sorted.bam.flagstat
+      md5sum: 49f3d51a8804ce58fe9cecd2549d279b
+    - path: ./output/samtools/test.sorted.bam.idxstats
+      md5sum: 29ff2fa56d35b2a47625b8f517f1a947
+    - path: ./output/samtools/test.sorted.bam.stats
+      md5sum: 98aa88a39d26244c89bd4e577953fb48

tests/subworkflows/nf-core/bam_sort_samtools/main.nf

@@ -0,0 +1,21 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { BAM_SORT_SAMTOOLS } from '../../../../subworkflows/nf-core/bam_sort_samtools/main' addParams( sort_options: ['suffix': '.sorted']  )
+
+workflow test_bam_sort_samtools_single_end {
+    input = [ [ id:'test', single_end:false ], // meta map
+                file(params.test_data['sarscov2']['illumina']['test_single_end_bam'], checkIfExists: true)
+            ]
+
+     BAM_SORT_SAMTOOLS ( input )
+}
+
+workflow test_bam_sort_samtools_paired_end {
+    input = [ [ id:'test', single_end:false ], // meta map
+                file(params.test_data['sarscov2']['illumina']['test_paired_end_bam'], checkIfExists: true)
+            ]
+
+     BAM_SORT_SAMTOOLS ( input )
+}

tests/subworkflows/nf-core/bam_sort_samtools/test.yml

@@ -0,0 +1,47 @@
+- name: bam sort samtools single-end
+  command: nextflow run ./tests/subworkflows/nf-core/bam_sort_samtools -entry test_bam_sort_samtools_single_end -c tests/config/nextflow.config
+  tags:
+    - subworkflows/bam_sort_samtools
+    - subworkflows/bam_stats_samtools
+    # Modules
+    - samtools
+    - samtools/index
+    - samtools/sort
+    - samtools/stats
+    - samtools/idxstats
+    - samtools/flagstat
+  files:
+    - path: ./output/samtools/test.sorted.bam
+      md5sum: e4c77897d6824ce4df486d1b100618af
+    - path: ./output/samtools/test.sorted.bam.bai
+      md5sum: a70940ce9ba2e700ec2984e0a6526099
+      # samtools stats
+    - path: ./output/samtools/test.sorted.bam.flagstat
+      md5sum: 2191911d72575a2358b08b1df64ccb53
+    - path: ./output/samtools/test.sorted.bam.idxstats
+      md5sum: 613e048487662c694aa4a2f73ca96a20
+    - path: ./output/samtools/test.sorted.bam.stats
+
+- name: bam sort samtools paired-end
+  command: nextflow run ./tests/subworkflows/nf-core/bam_sort_samtools -entry test_bam_sort_samtools_paired_end -c tests/config/nextflow.config
+  tags:
+    - subworkflows/bam_sort_samtools
+    - subworkflows/bam_stats_samtools
+    # Modules
+    - samtools
+    - samtools/index
+    - samtools/sort
+    - samtools/stats
+    - samtools/idxstats
+    - samtools/flagstat
+  files:
+    - path: ./output/samtools/test.sorted.bam
+      md5sum: bbb2db225f140e69a4ac577f74ccc90f
+    - path: ./output/samtools/test.sorted.bam.bai
+      md5sum: 20c91e3a0fd4661d7cb967f40d2486ba
+      # samtools stats
+    - path: ./output/samtools/test.sorted.bam.flagstat
+      md5sum: 4f7ffd1e6a5e85524d443209ac97d783
+    - path: ./output/samtools/test.sorted.bam.idxstats
+      md5sum: df60a8c8d6621100d05178c93fb053a2
+    - path: ./output/samtools/test.sorted.bam.stats

tests/subworkflows/nf-core/bam_stats_samtools/main.nf

@@ -0,0 +1,23 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { BAM_STATS_SAMTOOLS } from '../../../../subworkflows/nf-core/bam_stats_samtools/main' addParams( options: [:] )
+
+workflow test_bam_stats_samtools_single_end {
+    input = [ [ id:'test', single_end:false ], // meta map
+             file(params.test_data['sarscov2']['illumina']['test_single_end_sorted_bam'], checkIfExists: true),
+             file(params.test_data['sarscov2']['illumina']['test_single_end_sorted_bam_bai'], checkIfExists: true)
+    ]
+
+    BAM_STATS_SAMTOOLS ( input )
+}
+
+workflow test_bam_stats_samtools_paired_end {
+    input = [ [ id:'test', single_end:false ], // meta map
+             file(params.test_data['sarscov2']['illumina']['test_paired_end_sorted_bam'], checkIfExists: true),
+             file(params.test_data['sarscov2']['illumina']['test_paired_end_sorted_bam_bai'], checkIfExists: true)
+    ]
+
+    BAM_STATS_SAMTOOLS ( input )
+}

tests/subworkflows/nf-core/bam_stats_samtools/test.yml

@@ -0,0 +1,31 @@
+- name: bam stats samtools single-end
+  command: nextflow run ./tests/subworkflows/nf-core/bam_stats_samtools -entry test_bam_stats_samtools_single_end -c tests/config/nextflow.config
+  tags:
+    - subworkflows/bam_stats_samtools
+    # Modules
+    - samtools
+    - samtools/stats
+    - samtools/idxstats
+    - samtools/flagstat
+  files:
+    - path: ./output/samtools/test.single_end.sorted.bam.flagstat
+      md5sum: 2191911d72575a2358b08b1df64ccb53
+    - path: ./output/samtools/test.single_end.sorted.bam.idxstats
+      md5sum: 613e048487662c694aa4a2f73ca96a20
+    - path: ./output/samtools/test.single_end.sorted.bam.stats
+
+- name: bam stats samtools paired-end
+  command: nextflow run ./tests/subworkflows/nf-core/bam_stats_samtools -entry test_bam_stats_samtools_paired_end -c tests/config/nextflow.config
+  tags:
+    - subworkflows/bam_stats_samtools
+    # Modules
+    - samtools
+    - samtools/stats
+    - samtools/idxstats
+    - samtools/flagstat
+  files:
+    - path: ./output/samtools/test.paired_end.sorted.bam.flagstat
+      md5sum: 4f7ffd1e6a5e85524d443209ac97d783
+    - path: ./output/samtools/test.paired_end.sorted.bam.idxstats
+      md5sum: df60a8c8d6621100d05178c93fb053a2
+    - path: ./output/samtools/test.paired_end.sorted.bam.stats

tests/test_versions_yml.py

@@ -11,7 +11,7 @@ def _get_workflow_names():
     To do so, recursively finds all test.yml files and parses their content.
     """
     here = Path(__file__).parent.resolve()
-    pytest_workflow_files = here.glob("**/test.yml")
+    pytest_workflow_files = here.glob("modules/**/test.yml")
     for f in pytest_workflow_files:
         # test_config = yaml.safe_load(f.read_text())
         test_config = yaml.load(f.read_text(), Loader=yaml.BaseLoader)