From f1944d89f022f0ed415fee7ac039b6864fd8794c Mon Sep 17 00:00:00 2001
From: "Lukas Klinzing (WS)" <theluk@gmail.com>
Date: Sun, 8 Jul 2018 20:24:23 +0200
Subject: [PATCH] fixes #61

---
 src/rulesRunner.js     |  4 ++--
 test/issues/61.test.js | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)
 create mode 100644 test/issues/61.test.js

diff --git a/src/rulesRunner.js b/src/rulesRunner.js
index 1e82cbdb..85776793 100644
--- a/src/rulesRunner.js
+++ b/src/rulesRunner.js
@@ -35,10 +35,10 @@ export default function rulesRunner(
   schema,
   uiSchema,
   rules,
-  Engine,
+  engine,
   extraActions
 ) {
-  let engine = new Engine([], schema);
+  engine = typeof engine === "function" ? new engine([], schema) : engine;
   normRules(rules).forEach(rule => engine.addRule(rule));
 
   return formData => {
diff --git a/test/issues/61.test.js b/test/issues/61.test.js
new file mode 100644
index 00000000..69cc7c85
--- /dev/null
+++ b/test/issues/61.test.js
@@ -0,0 +1,21 @@
+import rulesRunner from "../../src/rulesRunner";
+import Engine from "json-rules-engine-simplified";
+
+test("rulesRunner with own Engine instantiation", () => {
+  let rules = [
+    {
+      conditions: { name: { not: "empty" } },
+      event: "foo",
+    },
+  ];
+
+  rulesRunner(
+    // schema
+    { properties: { name: { type: "string" } } },
+    // ui
+    {},
+    // rules
+    rules,
+    new Engine(rules)
+  )({}).then(() => {});
+});