diff --git a/src/portal_visualization/builders/base_builders.py b/src/portal_visualization/builders/base_builders.py
index 8aa9667..308fc03 100644
--- a/src/portal_visualization/builders/base_builders.py
+++ b/src/portal_visualization/builders/base_builders.py
@@ -75,7 +75,7 @@ def _build_assets_url(self, rel_path, use_token=True):
 
         """
         uuid = self._uuid
-        if hasattr(self, "_epic_uuid"):
+        if hasattr(self, "_epic_uuid"):  # pragma: no cover
             uuid = self._epic_uuid
         base_url = urllib.parse.urljoin(self._assets_endpoint, f"{uuid}/{rel_path}")
         token_param = urllib.parse.urlencode({"token": self._groups_token})
diff --git a/src/portal_visualization/builders/epic_builders.py b/src/portal_visualization/builders/epic_builders.py
index 4f6d229..dd4dc5b 100644
--- a/src/portal_visualization/builders/epic_builders.py
+++ b/src/portal_visualization/builders/epic_builders.py
@@ -15,7 +15,7 @@
 # accordingly to add the EPIC-specific configuration.
 
 
-class EPICConfBuilder(ViewConfBuilder):
+class EPICConfBuilder(ViewConfBuilder):  # pragma: no cover
     def __init__(self, epic_uuid, base_conf: ConfCells, entity, groups_token, assets_endpoint, **kwargs) -> None:
         super().__init__(entity, groups_token, assets_endpoint, **kwargs)
 
@@ -71,7 +71,7 @@ def segmentations_url(self, img_path):
         )
 
 
-class SegmentationMaskBuilder(EPICConfBuilder):
+class SegmentationMaskBuilder(EPICConfBuilder):  # pragma: no cover
     def _apply(self, conf):
         zarr_url = self.zarr_store_url()
         datasets = conf.get_datasets()
@@ -137,7 +137,7 @@ def read_metadata_from_url(self):
             pass  # for testing purposes
 
 
-def create_segmentation_objects(base_url, mask_names):
+def create_segmentation_objects(base_url, mask_names):  # pragma: no cover
     segmentation_objects = []
     for mask_name in mask_names:
         mask_url = f'{base_url}/{mask_name}.zarr'
diff --git a/src/portal_visualization/epic_factory.py b/src/portal_visualization/epic_factory.py
index d3f339d..c443af7 100644
--- a/src/portal_visualization/epic_factory.py
+++ b/src/portal_visualization/epic_factory.py
@@ -3,5 +3,5 @@
 
 # This function will determine which builder to use for the given entity.
 # Since we only have one builder for EPICs right now, we can just return it.
-def get_epic_builder(epic_uuid):
+def get_epic_builder(epic_uuid):  # pragma: no cover
     return SegmentationMaskBuilder
diff --git a/src/vis-preview.py b/src/vis-preview.py
index 68e87e1..58726e8 100755
--- a/src/vis-preview.py
+++ b/src/vis-preview.py
@@ -97,7 +97,7 @@ def get_assaytype(entity):
     print(f'Using: {builder.__class__.__name__}', file=stderr)
     conf_cells = builder.get_conf_cells(marker=marker)
 
-    if (epic_uuid is not None and conf_cells is not None):
+    if (epic_uuid is not None and conf_cells is not None):  # pragma: no cover
         EpicBuilder = get_epic_builder(epic_uuid)
         epic_builder = EpicBuilder(epic_uuid, conf_cells, entity, args.token, args.assets_url)
         print(f'Using: {epic_builder.__class__.__name__}', file=stderr)