diff --git a/src/engine.py b/src/engine.py
new file mode 100644
index 0000000..929ac9f
--- /dev/null
+++ b/src/engine.py
@@ -0,0 +1,4 @@
+class Engine:
+    """Calculates a sequence."""
+
+    
diff --git a/src/models.py b/src/models.py
index 5d8a321..eebbbe6 100644
--- a/src/models.py
+++ b/src/models.py
@@ -153,43 +153,44 @@ class Flickr:
         return Flickr.schema().loads(json)
 
 
-f = Flickr(
-    [
-        Space(
-            "iosf",
-            "Living Room",
-            [
-                Fixture(
-                    "98iwd",
-                    "Cool Light",
-                    Capabilities.BRIGHTNESS,
-                    SpaceVector(),
-                    SpaceVector(),
-                    SpaceVector(),
-                    0.5,
-                )
-            ],
-            SpaceVector(),
-        )
-    ],
-    [
-        Sequence(
-            "094rj",
-            "Thunder",
-            [
-                Track(
-                    "89idf",
-                    "Ceiling flicker",
-                    ["98iwd"],
-                    [Keyframe(Decimal.from_float(0), "bri", 1)],
-                )
-            ],
-        )
-    ],
-)
+if __name__ == "__main__":
+    # Small test
+    f = Flickr(
+        [
+            Space(
+                "iosf",
+                "Living Room",
+                [
+                    Fixture(
+                        "98iwd",
+                        "Cool Light",
+                        Capabilities.BRIGHTNESS,
+                        SpaceVector(),
+                        SpaceVector(),
+                        SpaceVector(),
+                        0.5,
+                    )
+                ],
+                SpaceVector(),
+            )
+        ],
+        [
+            Sequence(
+                "094rj",
+                "Thunder",
+                [
+                    Track(
+                        "89idf",
+                        "Ceiling flicker",
+                        ["98iwd"],
+                        [Keyframe(Decimal.from_float(0), "bri", 1)],
+                    )
+                ],
+            )
+        ],
+    )
 
+    f.save("test.json")
+    a = Flickr.load("test.json")
 
-f.save("test.json")
-a = Flickr.load("test.json")
-
-print(f.to_json())
+    print(f.to_json())