diff --git a/tests/test_hdtimeline.py b/tests/test_hdtimeline.py
index 736cabb..bd9cc34 100644
--- a/tests/test_hdtimeline.py
+++ b/tests/test_hdtimeline.py
@@ -1,11 +1,19 @@
 import sys
+import glob
 sys.path.insert(0,".") # For Github
+sys.path.insert(0,"./hdtimelines") # in case this is run when a submodule
 
 from hdtimelines import hdtimeline
 
 def test_hdtimeline():
+    # Find test data path
+    if glob.glob('./hdtimelines/test_data/'):
+        path = './hdtimelines/test_data'
+    else:
+        path = './test_data'
+
     hd = hdtimeline.hdTimeLine("Test timeline")
-    hd.add_topic_csv('Monarchs extract','./test_data/British Monarchs_extract_ok.csv')
+    hd.add_topic_csv('Monarchs extract',f'{path}/British Monarchs_extract_ok.csv')
     daterange = hd.get_date_range()
 
     assert hd.title == "Test timeline"
@@ -21,7 +29,7 @@ def test_hdtimeline():
             'url': 'https://en.wikipedia.org/wiki/William_the_Conqueror'}
     assert hd.topics[0].events[0] == dtest
 
-    hd.add_topic_csv('Playwrights extract','./test_data/Playwrights_extract_ok.csv')
+    hd.add_topic_csv('Playwrights extract',f'{path}/Playwrights_extract_ok.csv')
     hd.move_topic(id=1, indexshift=1)   # Move Monarchs down
     assert [topic.id for topic in hd.topics] == [2, 1]
 
diff --git a/tests/test_pltimeline.py b/tests/test_pltimeline.py
index 6286582..42f7146 100644
--- a/tests/test_pltimeline.py
+++ b/tests/test_pltimeline.py
@@ -1,5 +1,6 @@
 import sys
 sys.path.insert(0,".") # For Github
+sys.path.insert(0,"./hdtimelines") # in case this is run when a submodule
 
 from hdtimelines import pltimeline
 from historicaldate import hdateutils
diff --git a/tests/test_pltutils.py b/tests/test_pltutils.py
index 4a4284d..f0ec90a 100644
--- a/tests/test_pltutils.py
+++ b/tests/test_pltutils.py
@@ -1,20 +1,28 @@
 import sys
 sys.path.insert(0,".") # For Github
+sys.path.insert(0,"./hdtimelines") # in case this is run when a submodule
 
+import glob
 from hdtimelines import pltutils
 import pandas as pd
 
 def test_check_dataframe():
-    df = pd.read_csv('./test_data/Playwrights_extract_ok.csv', na_filter=False)
+    # Find test data path
+    if glob.glob('./hdtimelines/test_data/'):
+        path = './hdtimelines/test_data'
+    else:
+        path = './test_data'
+
+    df = pd.read_csv(f'{path}/Playwrights_extract_ok.csv', na_filter=False)
     result, message =  pltutils.check_dataframe(df)
     assert result
 
-    df = pd.read_csv('./test_data/British Monarchs_extract_ok.csv', na_filter=False)
+    df = pd.read_csv(f'{path}/British Monarchs_extract_ok.csv', na_filter=False)
     result, message =  pltutils.check_dataframe(df)
     assert result
     
     assert pltutils.check_dataframe(df)
-    df = pd.read_csv('./test_data/British Monarchs_extract_notok_no_label.csv', na_filter=False)
+    df = pd.read_csv(f'{path}/British Monarchs_extract_notok_no_label.csv', na_filter=False)
     result, message =  pltutils.check_dataframe(df)
     assert not result
     assert message == "Error: KeyError('label')"