3 files changed, 6 insertions, 6 deletions
diff --git a/gerbonara/gerber/tests/test_cairo_backend.py b/gerbonara/gerber/tests/test_cairo_backend.py
index 51007a9..3dc783d 100644
--- a/gerbonara/gerber/tests/test_cairo_backend.py
+++ b/gerbonara/gerber/tests/test_cairo_backend.py
@@ -221,7 +221,7 @@ def _test_render(gerber_path, png_expected_path, create_output_path=None):
     ctx = GerberCairoContext()
     gerber.render(ctx)
 
-    actual_bytes = ctx.dump(None)
+    actual_bytes = ctx.dump_str()
 
     # If we want to write the file bytes, do it now. This happens
     if create_output_path:
diff --git a/gerbonara/gerber/tests/test_common.py b/gerbonara/gerber/tests/test_common.py
index a6b1264..e4c023c 100644
--- a/gerbonara/gerber/tests/test_common.py
+++ b/gerbonara/gerber/tests/test_common.py
@@ -24,9 +24,9 @@ def test_file_type_detection():
 
 
 def test_load_from_string():
-    with open(NCDRILL_FILE, "rU") as f:
+    with open(NCDRILL_FILE, "r") as f:
         ncdrill = loads(f.read())
-    with open(TOP_COPPER_FILE, "rU") as f:
+    with open(TOP_COPPER_FILE, "r") as f:
         top_copper = loads(f.read())
     assert isinstance(ncdrill, ExcellonFile)
     assert isinstance(top_copper, GerberFile)
diff --git a/gerbonara/gerber/tests/test_excellon.py b/gerbonara/gerber/tests/test_excellon.py
index d6e83cc..ef34f67 100644
--- a/gerbonara/gerber/tests/test_excellon.py
+++ b/gerbonara/gerber/tests/test_excellon.py
@@ -17,7 +17,7 @@ NCDRILL_FILE = os.path.join(os.path.dirname(__file__), "resources/ncdrill.DRD")
 def test_format_detection():
     """ Test file type detection
     """
-    with open(NCDRILL_FILE, "rU") as f:
+    with open(NCDRILL_FILE, "r") as f:
         data = f.read()
     settings = detect_excellon_format(data)
     assert settings["format"] == (2, 4)
@@ -36,9 +36,9 @@ def test_read():
 def test_write():
     ncdrill = read(NCDRILL_FILE)
     ncdrill.write("test.ncd")
-    with open(NCDRILL_FILE, "rU") as src:
+    with open(NCDRILL_FILE, "r") as src:
         srclines = src.readlines()
-    with open("test.ncd", "rU") as res:
+    with open("test.ncd", "r") as res:
         for idx, line in enumerate(res):
             assert line.strip() == srclines[idx].strip()
     os.remove("test.ncd")