add states tests

tests/states.py

@@ -0,0 +1,41 @@
+#!/usr/bin/python3
+# 
+
+def waitMouseClick():
+    print("wait mouse click")
+    mouse = open( "/dev/input/mice", "rb" )
+    down = False;
+    while True:
+        buf = mouse.read(3)
+        if ((buf[0] & 0x1)==1):
+            down = True
+        if (((buf[0] & 0x1)==0) and down):        
+            break;
+    mouse.close()
+
+def loop(state):
+    print('loop ' +state)
+    match state:
+        case "START":
+            waitMouseClick()
+            return "STEP1"
+        case "STEP1":
+            waitMouseClick()
+            return "STEP2"
+        case "STEP2":
+            waitMouseClick()
+            return "STOP"
+        case _:
+            print("Unknwn state "+state)
+            return "STOP"
+    print("end loop")
+
+
+if __name__ == "__main__":
+    # The client code.
+
+    state="START"
+    while (state!="STOP"):
+        state = loop(state)
+
+