Add Testing.individual_test_case_health API

This will be used to render individual test case health widget

tcms/telemetry/api.py

@@ -226,6 +226,44 @@ def test_case_health(query=None):
     return data
 
 
+@http_basic_auth_login_required
+@rpc_method(name="Testing.individual_test_case_health")
+def individual_test_case_health(query=None):
+
+    if query is None:
+        query = {}
+
+    res = {}
+    plan_id = 0
+    positive, negative, all_count = 0, 0, 0
+    for test_execution in (
+        TestExecution.objects.filter(**query)
+        .values("run__plan", "case_id", "status__name", "status__weight")
+        .order_by("case", "run__plan", "status__weight")
+    ):
+        if test_execution["status__weight"] > 0:
+            positive += 1
+        elif test_execution["status__weight"] < 0:
+            negative += 1
+        all_count += 1
+
+        if test_execution["run__plan"] != plan_id:
+            plan_id = test_execution["run__plan"]
+            res[plan_id] = {
+                "completion_rate": (positive + negative) / all_count,
+                "failure_rate": negative / all_count,
+            }
+            positive, negative, all_count = 0, 0, 0
+
+    # append the last result
+    res[plan_id] = {
+        "completion_rate": (positive + negative) / all_count,
+        "failure_rate": negative / all_count,
+    }
+
+    return res
+
+
 def _remove_all_excellent_executions(data):
     for key in dict.fromkeys(data):
         if data[key]["count"]["fail"] == 0: