From 52e4e0e569f52c4f464adef150986c6c445073a9 Mon Sep 17 00:00:00 2001
From: Dave Conway-Jones <conway@uk.ibm.com>
Date: Tue, 11 Jan 2022 13:56:44 +0000
Subject: [PATCH] Fix for narrrowbandEq mode start condition failure

And add test
As discussed https://discourse.nodered.org/t/the-filter-node-or-the-old-rbe-node/56371
---
 packages/node_modules/@node-red/nodes/core/function/rbe.js | 2 +-
 test/nodes/core/function/rbe_spec.js                       | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/packages/node_modules/@node-red/nodes/core/function/rbe.js b/packages/node_modules/@node-red/nodes/core/function/rbe.js
index 4548a8c6a..eb526a441 100644
--- a/packages/node_modules/@node-red/nodes/core/function/rbe.js
+++ b/packages/node_modules/@node-red/nodes/core/function/rbe.js
@@ -58,7 +58,7 @@ module.exports = function(RED) {
                 else {
                     var n = parseFloat(value);
                     if (!isNaN(n)) {
-                        if ((typeof node.previous[t] === 'undefined') && (this.func === "narrowband")) {
+                        if ((typeof node.previous[t] === 'undefined') && (this.func === "narrowband" || this.func === "narrowbandEq")) {
                             if (node.start === '') { node.previous[t] = n; }
                             else { node.previous[t] = node.start; }
                         }
diff --git a/test/nodes/core/function/rbe_spec.js b/test/nodes/core/function/rbe_spec.js
index 2ef005a27..56a93bdbf 100644
--- a/test/nodes/core/function/rbe_spec.js
+++ b/test/nodes/core/function/rbe_spec.js
@@ -425,7 +425,7 @@ describe('rbe node', function() {
     });
 
     it('should not send output if x away or greater from original value (narrowbandEq)', function(done) {
-        var flow = [{"id":"n1", "type":"rbe", func:"narrowbandEq", gap:"10", inout:"out", wires:[["n2"]] },
+        var flow = [{"id":"n1", "type":"rbe", func:"narrowbandEq", gap:"10", inout:"out", start:"1", wires:[["n2"]] },
             {id:"n2", type:"helper"} ];
         helper.load(testNode, flow, function() {
             var n1 = helper.getNode("n1");
@@ -445,6 +445,7 @@ describe('rbe node', function() {
                     done();
                 }
             });
+            n1.emit("input", {payload:100});
             n1.emit("input", {payload:0});
             n1.emit("input", {payload:10});
             n1.emit("input", {payload:5});