test: updated resetForTests function

Author: jaissica12

src/mp-instance.ts

@@ -222,6 +222,48 @@ export default function mParticleInstance(this: IMParticleWebSDKInstance, instan
     };
 
     this._resetForTests = function(config, keepPersistence, instance) {
+        if (typeof window !== 'undefined') {
+            type TestWindow = Window & { mParticle?: { _isTestEnv?: boolean } };
+            const sdkWindow = window as TestWindow;
+            if (sdkWindow.mParticle?._isTestEnv && config) {
+                type TestFlags = {
+                    eventBatchingIntervalMillis?: number | string;
+                    astBackgroundEvents?: string;
+                    offlineStorage?: string;
+                };
+                const configWithFlags = config as { flags?: TestFlags };
+                const flags = (configWithFlags.flags ??= {});
+                if (flags.eventBatchingIntervalMillis == null) {
+                    flags.eventBatchingIntervalMillis = 0;
+                }
+                if (flags.astBackgroundEvents == null) {
+                    flags.astBackgroundEvents = 'False';
+                }
+                if (flags.offlineStorage == null) {
+                    flags.offlineStorage = '0';
+                }
+                window.onbeforeunload = null;
+            }
+        }
+        
+        if (
+            instance?._Store?.globalTimer &&
+            instance._Store.globalTimer > 0
+        ) {
+            clearTimeout(instance._Store.globalTimer);
+            instance._Store.globalTimer = 0;
+        }
+
+        if (typeof window !== 'undefined') {
+            type MParticleSDK = { _forwardingStatsTimer?: number | null };
+            const mParticleSDK = (window as Window & { mParticle?: MParticleSDK }).mParticle;
+            const forwardingStatsTimer = mParticleSDK?._forwardingStatsTimer;
+            if (typeof forwardingStatsTimer === 'number' && mParticleSDK) {
+                clearInterval(forwardingStatsTimer);
+                mParticleSDK._forwardingStatsTimer = null;
+            }
+        }
+
         if (instance._Store) {
             delete instance._Store;
         }