[ewoks][test] add missing condition if larch or pymca installed

est/test/test_ewoks.py

@@ -37,6 +37,19 @@ import shutil
 import os
 import xml.etree.ElementTree as ET
 
+try:
+    import PyMca5
+except ImportError:
+    has_pymca = False
+else:
+    has_pymca = True
+try:
+    import larch
+except ImportError:
+    has_larch = False
+else:
+    has_larch = True
+
 
 class TestOrangeGraph(unittest.TestCase):
     def setUp(self) -> None:
@@ -61,6 +74,7 @@ class TestOrangeGraph(unittest.TestCase):
             link_node.get("source_channel_id"),
         )
 
+    @unittest.skipIf(has_pymca is False, "PyMca5 is not installed")
     def test_orange_graph_pymca(self):
         """test conversion of a workflow based on pymca to ewoks graph
         from orange to ewoks and from ewoks to orange"""
@@ -121,6 +135,7 @@ class TestOrangeGraph(unittest.TestCase):
         links_by_id = {link.get("id"): self.get_link_info(link) for link in links}
         self.assertEqual(len(links_by_id), 5)
 
+    @unittest.skipIf(has_larch is False, "xraylarch not installed")
     def test_orange_graph_larch(self):
         """test conversion of a workflow based on larch to ewoks graph
         from orange to ewoks and from ewoks to orange"""