From 67a249f52866aa463330352e7def8e3367ac53fe Mon Sep 17 00:00:00 2001
From: kovacsv <viktorkovacs@gmail.com>
Date: Mon, 14 Jun 2021 14:25:23 +0200
Subject: [PATCH] Fix batch task running in case of zero count.

---
 source/core/taskrunner.js     |  5 ++++-
 test/tests/taskrunner_test.js | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/source/core/taskrunner.js b/source/core/taskrunner.js
index fcf6c39..1e19c99 100644
--- a/source/core/taskrunner.js
+++ b/source/core/taskrunner.js
@@ -21,7 +21,10 @@ OV.TaskRunner = class
 
     RunBatch (count, batchCount, callbacks)
     {
-        const stepCount = parseInt ((count - 1) / batchCount, 10) + 1;
+        let stepCount = 0;
+        if (count > 0) {
+            stepCount = parseInt ((count - 1) / batchCount, 10) + 1;
+        }
         this.Run (stepCount, {
             runTask : function (index, ready) {
                 const firstIndex = index * batchCount;
diff --git a/test/tests/taskrunner_test.js b/test/tests/taskrunner_test.js
index d43cb9b..492a05f 100644
--- a/test/tests/taskrunner_test.js
+++ b/test/tests/taskrunner_test.js
@@ -44,5 +44,20 @@ describe ('Task Runner', function () {
                 done ();
             }
         });
+    });
+
+    it ('Run task batched zero times', function (done) {
+        var tr = new OV.TaskRunner ();
+        var indices = [];
+        tr.RunBatch (0, 3, {
+            runTask : function (firstIndex, lastIndex, ready) {
+                indices.push ([firstIndex, lastIndex]);
+                ready ();
+            },
+            onReady : function () {
+                assert.deepStrictEqual (indices, []);
+                done ();
+            }
+        });
     });     
 });