Add testing code

src/patterns.py

@@ -225,3 +225,13 @@ class Patterns(PatternsBase):
 
                 self.last_update = current_time
             yield
+
+if __name__ == "__main__":
+    from time import sleep_ms
+    p = Patterns(10, 200)
+    p.set_delay(100)
+    p.set_color(0, (16,0,0))
+    p.select("blink")
+    for i in range(2000):
+        p.tick()
+        sleep_ms(1)