diff --git a/src/modules/actions/api/initial.ts b/src/modules/actions/api/initial.ts
index 8ea11d6f9..cb06bf58c 100644
--- a/src/modules/actions/api/initial.ts
+++ b/src/modules/actions/api/initial.ts
@@ -10,6 +10,7 @@ import {
   MEDIA_CACHE_NAME,
   MEDIA_CACHE_NAME_AVATARS,
   MEDIA_PROGRESSIVE_CACHE_NAME,
+  IS_TEST,
 } from '../../../config';
 import { initApi, callApi } from '../../../api/gramjs';
 import { unsubscribe } from '../../../util/notifications';
@@ -22,12 +23,17 @@ import {
   clearStoredSession,
   importLegacySession,
   clearLegacySessions,
+  importTestSession,
 } from './sessions';
 
 addReducer('initApi', (global: GlobalState, actions) => {
   (async () => {
-    await importLegacySession();
-    void clearLegacySessions();
+    if (!IS_TEST) {
+      await importLegacySession();
+      void clearLegacySessions();
+    } else {
+      importTestSession();
+    }
 
     void initApi(actions.apiUpdate, loadStoredSession());
   })();
diff --git a/src/modules/actions/api/sessions.ts b/src/modules/actions/api/sessions.ts
index 06a1b3fb9..4d13605db 100644
--- a/src/modules/actions/api/sessions.ts
+++ b/src/modules/actions/api/sessions.ts
@@ -98,3 +98,17 @@ export async function clearLegacySessions() {
       .map((k) => idb.del(k)),
   ]);
 }
+
+export function importTestSession() {
+  const sessionJson = process.env.TEST_SESSION!;
+  try {
+    const sessionData = JSON.parse(sessionJson) as ApiSessionData;
+    storeSession(sessionData);
+  } catch (err) {
+    if (DEBUG) {
+      // eslint-disable-next-line no-console
+      console.warn('Failed to load test session', err);
+    }
+    // Do nothing.
+  }
+}
diff --git a/src/util/environment.ts b/src/util/environment.ts
index eb9bcb440..6c724f0be 100644
--- a/src/util/environment.ts
+++ b/src/util/environment.ts
@@ -2,6 +2,7 @@ import {
   MOBILE_SCREEN_MAX_WIDTH,
   MOBILE_SCREEN_LANDSCAPE_MAX_HEIGHT,
   MOBILE_SCREEN_LANDSCAPE_MAX_WIDTH,
+  IS_TEST,
 } from '../config';
 
 export function getPlatform() {
@@ -47,7 +48,9 @@ export const IS_SERVICE_WORKER_SUPPORTED = 'serviceWorker' in navigator;
 export const IS_PROGRESSIVE_SUPPORTED = IS_SERVICE_WORKER_SUPPORTED;
 export const IS_STREAMING_SUPPORTED = 'MediaSource' in window;
 export const IS_OPUS_SUPPORTED = Boolean((new Audio()).canPlayType('audio/ogg; codecs=opus'));
-export const IS_CANVAS_FILTER_SUPPORTED = 'filter' in (document.createElement('canvas').getContext('2d') || {});
+export const IS_CANVAS_FILTER_SUPPORTED = (
+  !IS_TEST && 'filter' in (document.createElement('canvas').getContext('2d') || {})
+);
 
 export const DPR = window.devicePixelRatio || 1;