feat: add nested fractional weight assertion (#352)

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

Author: toddbaert

flags/custom-ops.json

@@ -141,6 +141,31 @@
         ]
       }
     },
+    "fractional-nested-weight-flag": {
+      "state": "ENABLED",
+      "variants": {
+        "red": "red",
+        "blue": "blue",
+        "fallback": "fallback"
+      },
+      "defaultVariant": "fallback",
+      "targeting": {
+        "fractional": [
+          { "var": "targetingKey" },
+          [
+            "red",
+            {
+              "if": [
+                { "==": [{ "var": "tier" }, "premium"] },
+                100,
+                0
+              ]
+            }
+          ],
+          [ "blue", 10 ]
+        ]
+      }
+    },
     "starts-ends-flag": {
       "state": "ENABLED",
       "variants": {

gherkin/targeting.feature

@@ -171,6 +171,21 @@ Feature: Targeting rules
       | jon@company.com | yellow | fallback |
       | jon@company.com |        | fallback |
 
+  @fractional @fractional-nested
+  Scenario Outline: Fractional operator with nested if expression as weight
+    # fractional-nested-weight-flag: seed=targetingKey, bucket0=["red",if(tier=="premium",100,0)], bucket1=["blue",10]
+    Given a String-flag with key "fractional-nested-weight-flag" and a default value "fallback"
+    And a context containing a targeting key with value "<targetingKey>"
+    And a context containing a key "tier", with type "String" and with value "<tier>"
+    When the flag was evaluated with details
+    Then the resolved details value should be "<value>"
+    Examples:
+      | targetingKey    | tier    | value   |
+      | jon@company.com | premium | red     |
+      | jon@company.com | basic   | blue    |
+      | user1           | premium | red     |
+      | user1           | basic   | blue    |
+
   @string
   Scenario Outline: Substring operators
     Given a String-flag with key "starts-ends-flag" and a default value "fallback"