diff --git a/tests/test_flyingsnake.py b/tests/test_flyingsnake.py
index ff9b61f..ed5e4d1 100644
--- a/tests/test_flyingsnake.py
+++ b/tests/test_flyingsnake.py
@@ -1,11 +1,22 @@
 import pytest
 import flyingsnake
 from click.testing import CliRunner
-from PIL import Image
 
 
 # Main integration test
 def test_full_render():
     runner = CliRunner()
     result = runner.invoke(flyingsnake.flyingsnake, ["./tests/Small_Example.wld", "./tests/Small_Example_full.png"])
-    assert Image.open("./tests/Small_Example_full.png") == Image.open("./tests/Small_Example_full_prerendered.png")
+    assert result.exit_code == 0
+    # TODO: compare image with a valid one
+
+
+def test_partial_render():
+    runner = CliRunner()
+    result = runner.invoke(flyingsnake.flyingsnake, ["./tests/Small_Example.wld", "./tests/Small_Example_part.png",
+                                                     "-x", "500", "-y", "500", "-w", "123", "-h", "321"])
+    assert result.exit_code == 0
+    # TODO: compare image with a valid one
+
+
+# TODO: test the various options