fix: send proper retry count to retry's interaval func (#1621)

Closes #1578

2 files changed, 7 insertions, 2 deletions

diff --git a/lib/retry.js b/lib/retry.js
index 5ef6971..55dce0a 100644
--- a/lib/retry.js
+++ b/lib/retry.js
@@ -122,7 +122,7 @@ export default function retry(opts, task, callback) {
             if (err && attempt++ < options.times &&
                 (typeof options.errorFilter != 'function' ||
                     options.errorFilter(err))) {
-                setTimeout(retryAttempt, options.intervalFunc(attempt));
+                setTimeout(retryAttempt, options.intervalFunc(attempt - 1));
             } else {
                 callback(err, ...args);
             }
diff --git a/test/retry.js b/test/retry.js
index e7bc36a..d6cc06d 100644
--- a/test/retry.js
+++ b/test/retry.js
@@ -79,7 +79,11 @@ describe("retry", () => {
 
     it('retry with custom interval when all attempts fail',(done) => {
         var times = 3;
-        var intervalFunc = function(retryCount) { return retryCount * 100; };
+        var retryCounts = []
+        var intervalFunc = function(retryCount) {
+            retryCounts.push(retryCount)
+            return retryCount * 100;
+        };
         var callCount = 0;
         var error = 'ERROR';
         var erroredResult = 'RESULT';
@@ -94,6 +98,7 @@ describe("retry", () => {
             assert.equal(callCount, 3, "did not retry the correct number of times");
             assert.equal(err, error + times, "Incorrect error was returned");
             assert.equal(result, erroredResult + times, "Incorrect result was returned");
+            assert.deepEqual(retryCounts, [1, 2])
             done();
         });
     });