diff --git a/tests/Small_Example_partial_prerendered.png b/tests/Small_Example_partial_prerendered.png
new file mode 100644
index 0000000..a6b3a51
--- /dev/null
+++ b/tests/Small_Example_partial_prerendered.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:28fbe2b613ddb49e9bf63dc055a63a7f91323ff26fb74b3c810bf7166541f660
+size 17709
diff --git a/tests/test_flyingsnake.py b/tests/test_flyingsnake.py
index ff9b61f..93f10c2 100644
--- a/tests/test_flyingsnake.py
+++ b/tests/test_flyingsnake.py
@@ -2,10 +2,34 @@ import pytest
 import flyingsnake
 from click.testing import CliRunner
 from PIL import Image
+import hashlib
 
 
 # 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
+
+    with open("Small_Example_full_prerendered.png") as prerendered:
+        prerendered_hash = hashlib.sha1(prerendered)
+    with open("Small_Example_full.png") as created:
+        created_hash = hashlib.sha1(created)
+    assert prerendered_hash.hexdigest() == created_hash.hexdigest()
+
+
+def test_partial_render():
+    runner = CliRunner()
+    result = runner.invoke(flyingsnake.flyingsnake,
+                           ["./tests/Small_Example.wld", "./tests/Small_Example_partial.png",
+                            "-x", "100",
+                            "-y", "600",
+                            "-w", "321",
+                            "-h", "123"])
+    assert result.exit_code == 0
+
+    with open("Small_Example_partial_prerendered.png") as prerendered:
+        prerendered_hash = hashlib.sha1(prerendered)
+    with open("Small_Example_partial.png") as created:
+        created_hash = hashlib.sha1(created)
+    assert prerendered_hash.hexdigest() == created_hash.hexdigest()