feat: add test

Author: cdhawke

tests/CTS/requests/abtesting/estimateABTest.json

@@ -0,0 +1,23 @@
+[
+  {
+    "configuration": {
+      "emptySearch": {
+        "exclude": true
+      },
+      "minimumDetectableEffect": {
+        "size": 0.03,
+        "metric": "conversionrate"
+      }
+    },
+    "variants": [
+      {
+        "index": "AB_TEST_1",
+        "trafficPercentage": 50
+      },
+      {
+        "index": "AB_TEST_2",
+        "trafficPercentage": 50
+      }
+    ]
+  }
+]