diff --git a/countess/plugins/hgvs_parser.py b/countess/plugins/hgvs_parser.py
index d5a2fa6..4669b78 100644
--- a/countess/plugins/hgvs_parser.py
+++ b/countess/plugins/hgvs_parser.py
@@ -88,6 +88,7 @@ def series_to_dataframe(self, series: pd.Series) -> pd.DataFrame:
         dataframe = super().series_to_dataframe(series)
 
         if self.parameters["multi"].value:
+            
             if self.parameters["split"].value:
                 dataframe = dataframe.explode(["var", "loc"])
             else:
diff --git a/docs/included-plugins/index.md b/docs/included-plugins/index.md
index b7b9f68..c17877d 100644
--- a/docs/included-plugins/index.md
+++ b/docs/included-plugins/index.md
@@ -217,3 +217,22 @@ The reference sequence can either be provided directly as a configuration parame
 
 *See also: [countess-minimap2 plugin](https://github.com/CountESS-Project/countess-minimap2), a variant caller which uses 'minimap2' to find sequences within a genome.*
 
+#### Parameters
+
+Input Column
+: the input column with the variant sequence
+
+Reference
+: (optional) select column which contains the reference sequence ...
+
+Sequence
+: (optional) ... or supply a reference sequence as a value
+
+Output Column
+: Column name for HGVS string
+
+Max Mutations
+: Maximum number of mutations, if no variant with this number or less mutations is found then return a null value for the output
+
+Drop
+: Drop rows which would have null values for output
diff --git a/script/run-tests b/script/run-tests
index 0d538a9..81948de 100755
--- a/script/run-tests
+++ b/script/run-tests
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-coverage run --source=countess -m pytest --doctest-modules countess/ tests/
+xvfb-run coverage run --source=countess -m pytest --doctest-modules countess/ tests/
 
 coverage report --skip-empty --sort=-cover
 
diff --git a/tests/input1.tsv b/tests/input1.tsv
new file mode 100644
index 0000000..1adbea5
--- /dev/null
+++ b/tests/input1.tsv
@@ -0,0 +1,5 @@
+thing	count
+foo	1212
+bar	232
+baz	565
+qux	999
diff --git a/tests/input1.txt b/tests/input1.txt
new file mode 100644
index 0000000..e68a43f
--- /dev/null
+++ b/tests/input1.txt
@@ -0,0 +1,5 @@
+thing count
+foo   1212
+bar   232
+baz   565
+qux   999
diff --git a/tests/input2.csv b/tests/input2.csv
new file mode 100644
index 0000000..a1a1876
--- /dev/null
+++ b/tests/input2.csv
@@ -0,0 +1,4 @@
+x,y
+1,"this line has a comma, and a double "" quote"
+2,"this line has a comma, and an escaped \" quote"
+3,this line has a comment # don't read this
diff --git a/tests/plugins/test_csv.py b/tests/plugins/test_csv.py
index 8eaca3f..0bee0c1 100644
--- a/tests/plugins/test_csv.py
+++ b/tests/plugins/test_csv.py
@@ -1,6 +1,3 @@
-import pandas as pd
-import pytest
-
 from countess.core.logger import MultiprocessLogger
 from countess.plugins.csv import LoadCsvPlugin
 
@@ -9,10 +6,53 @@
 
 def test_load_csv():
     plugin = LoadCsvPlugin()
-
     plugin.set_parameter("files.0.filename", "tests/input1.csv")
+    output_df = next(plugin.load_file(0, logger))
+    assert list(output_df.columns) == ["thing", "count"]
+    assert len(output_df) == 4
 
+def test_load_tsv():
+    plugin = LoadCsvPlugin()
+    plugin.set_parameter("files.0.filename", "tests/input1.tsv")
+    plugin.set_parameter("delimiter", "TAB")
     output_df = next(plugin.load_file(0, logger))
+    assert list(output_df.columns) == ["thing", "count"]
+    assert len(output_df) == 4
 
+def test_load_txt():
+    plugin = LoadCsvPlugin()
+    plugin.set_parameter("files.0.filename", "tests/input1.txt")
+    plugin.set_parameter("delimiter", "WHITESPACE")
+    output_df = next(plugin.load_file(0, logger))
     assert list(output_df.columns) == ["thing", "count"]
     assert len(output_df) == 4
+
+def test_load_quoting_double():
+    plugin = LoadCsvPlugin()
+    plugin.set_parameter("files.0.filename", "tests/input2.csv")
+    plugin.set_parameter("quoting", "Double-Quote")
+    output_df = next(plugin.load_file(0, logger))
+    assert output_df['y'].iloc[0] == 'this line has a comma, and a double " quote'
+
+def test_load_quoting_escaped():
+    plugin = LoadCsvPlugin()
+    plugin.set_parameter("files.0.filename", "tests/input2.csv")
+    plugin.set_parameter("quoting", "Quote with Escape")
+    output_df = next(plugin.load_file(0, logger))
+    assert output_df['y'].iloc[1] == 'this line has a comma, and an escaped " quote'
+
+def test_load_comment():
+    plugin = LoadCsvPlugin()
+    plugin.set_parameter("files.0.filename", "tests/input2.csv")
+    plugin.set_parameter("quoting", "Double-Quote")
+    plugin.set_parameter("comment", "#")
+    output_df = next(plugin.load_file(0, logger))
+    assert output_df['y'].iloc[2] == "this line has a comment "
+
+def test_filename_column():
+    plugin = LoadCsvPlugin()
+    plugin.set_parameter("files.0.filename", "tests/input1.csv")
+    plugin.set_parameter("filename_column", 'filename')
+    output_df = next(plugin.load_file(0, logger))
+    assert 'filename' in output_df.columns
+    assert output_df['filename'].iloc[1] == "./tests/input1.csv"
diff --git a/tests/plugins/test_hgvs_parser.py b/tests/plugins/test_hgvs_parser.py
new file mode 100644
index 0000000..5e902ea
--- /dev/null
+++ b/tests/plugins/test_hgvs_parser.py
@@ -0,0 +1,78 @@
+
+import pandas as pd
+
+from countess.plugins.hgvs_parser import HgvsParserPlugin
+from countess.core.logger import MultiprocessLogger
+
+logger = MultiprocessLogger()
+
+df1 = pd.DataFrame([
+    {'hgvs': 'NC_000017.11:g.[43124022G>C;43124175C>T;43124111A>G]',
+     'guides': '43124022G>C;43124111A>G' }
+])
+
+def test_hgvs_parser():
+
+    plugin = HgvsParserPlugin()
+    plugin.set_parameter('column', 'hgvs')
+    plugin.set_parameter('guides_col', 'guides')
+    
+    df = plugin.process_dataframe(df1, logger)
+
+    assert df['var_1'].iloc[0] == '43124175C>T'
+    assert df['guide_1'].iloc[0] == True
+    assert df['guide_2'].iloc[0] == True
+
+def test_hgvs_parser_guides_str():
+
+    plugin = HgvsParserPlugin()
+    plugin.set_parameter('column', 'hgvs')
+    plugin.set_parameter('guides_str', '43124022G>C;43124111A>G')
+    
+    df = plugin.process_dataframe(df1, logger)
+
+    assert df['var_1'].iloc[0] == '43124175C>T'
+    assert df['guide_1'].iloc[0] == True
+    assert df['guide_2'].iloc[0] == True
+
+def test_hgvs_parser_split():
+    plugin = HgvsParserPlugin()
+    plugin.set_parameter('column', 'hgvs')
+    plugin.set_parameter('guides_col', 'guides')
+    plugin.set_parameter('split', True)
+
+    df = plugin.process_dataframe(df1, logger)
+ 
+    assert df['loc_1'].iloc[0] == '43124175'
+    assert df['var_1'].iloc[0] == 'C>T'
+    assert df['guide_1'].iloc[0] == True
+    assert df['guide_2'].iloc[0] == True
+
+def test_hgvs_parser_multi():
+
+    plugin = HgvsParserPlugin()
+    plugin.set_parameter('column', 'hgvs')
+    plugin.set_parameter('guides_str', '43124022G>C')
+    plugin.set_parameter('multi', True)
+    plugin.set_parameter('max_var', 2)
+
+    df = plugin.process_dataframe(df1, logger)
+
+    assert df['var'].iloc[0] == '43124175C>T'
+    assert df['var'].iloc[1] == '43124111A>G'
+
+def test_hgvs_parser_split_and_multi():
+
+    plugin = HgvsParserPlugin()
+    plugin.set_parameter('column', 'hgvs')
+    plugin.set_parameter('guides_str', '43124022G>C')
+    plugin.set_parameter('split', True)
+    plugin.set_parameter('multi', True)
+    plugin.set_parameter('max_var', 2)
+
+    df = plugin.process_dataframe(df1, logger)
+
+    assert df['var'].iloc[0] == 'C>T'
+    assert df['var'].iloc[1] == 'A>G'
+    assert df['loc'].iloc[0] == '43124175'
+    assert df['loc'].iloc[1] == '43124111'