diff --git a/assets/samplesheet_with_control.csv b/assets/samplesheet_with_control.csv
new file mode 100644
index 00000000..0e0e1944
--- /dev/null
+++ b/assets/samplesheet_with_control.csv
@@ -0,0 +1,7 @@
+sample,fastq_1,fastq_2,replicate,control,control_replicate
+SPT5_T0,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822153_1.fastq.gz,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822153_2.fastq.gz,1,SPT5_INPUT,1
+SPT5_T0,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822154_1.fastq.gz,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822154_2.fastq.gz,2,SPT5_INPUT,2
+SPT5_T15,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822157_1.fastq.gz,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822157_2.fastq.gz,1,SPT5_INPUT,1
+SPT5_T15,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822158_1.fastq.gz,https://raw.githubusercontent.com/nf-core/test-datasets/atacseq/testdata/SRR1822158_2.fastq.gz,2,SPT5_INPUT,2
+SPT5_INPUT,https://raw.githubusercontent.com/nf-core/test-datasets/chipseq/testdata/SRR5204809_Spt5-ChIP_Input1_SacCer_ChIP-Seq_ss100k_R1.fastq.gz,https://raw.githubusercontent.com/nf-core/test-datasets/chipseq/testdata/SRR5204809_Spt5-ChIP_Input1_SacCer_ChIP-Seq_ss100k_R2.fastq.gz,1,,
+SPT5_INPUT,https://raw.githubusercontent.com/nf-core/test-datasets/chipseq/testdata/SRR5204810_Spt5-ChIP_Input2_SacCer_ChIP-Seq_ss100k_R1.fastq.gz,https://raw.githubusercontent.com/nf-core/test-datasets/chipseq/testdata/SRR5204810_Spt5-ChIP_Input2_SacCer_ChIP-Seq_ss100k_R2.fastq.gz,2,,