[test][prefix] Update loop following output update

beat/core/test/prefix/algorithms/schema/invalid_loop_output/1.json

@@ -11,9 +11,6 @@
                 }
             },
             "outputs": {
-                "out": {
-                    "type": "user/single_integer/1"
-                }
             },
             "loop": {
                 "request": {

beat/core/test/prefix/algorithms/user/db_input_loop/1.json

@@ -10,6 +10,11 @@
                     "type": "user/single_integer/1"
                 }
             },
+            "outputs": {
+                "out": {
+                    "type": "user/single_integer/1"
+                }
+            },
             "loop": {
                 "request": {
                     "type": "user/1d_array_of_integers/1"

beat/core/test/prefix/algorithms/user/db_input_loop/1.py

@@ -41,6 +41,7 @@ class Algorithm:
     def __init__(self):
         self.threshold = None
         self.max = 0
+        self.output = None
 
     def setup(self, parameters):
         self.threshold = parameters["threshold"]
@@ -61,4 +62,8 @@ class Algorithm:
         value = result.value[0]
         result = value > self.threshold and value < self.max
         delta = self.max - value
+        self.output = delta
         return (result, {"value": np.float32(delta)})
+
+    def write(self, outputs):
+        outputs["out"].write({"value": np.int32(self.output)})