diff --git a/test/cross.auto_refresh.test.js b/test/cross.auto_refresh.test.js
index 65001c8d..95433d0b 100644
--- a/test/cross.auto_refresh.test.js
+++ b/test/cross.auto_refresh.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/cross.basic_jwt.test.js b/test/cross.basic_jwt.test.js
index 49224513..9b984cb2 100644
--- a/test/cross.basic_jwt.test.js
+++ b/test/cross.basic_jwt.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/cross.cross_domain.test.js b/test/cross.cross_domain.test.js
index 59b26787..558e1b39 100644
--- a/test/cross.cross_domain.test.js
+++ b/test/cross.cross_domain.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/cross.disable_interception.test.js b/test/cross.disable_interception.test.js
index 9cbb8b33..85ff9220 100644
--- a/test/cross.disable_interception.test.js
+++ b/test/cross.disable_interception.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/cross.resp_error.test.js b/test/cross.resp_error.test.js
index a32355c5..afb0d662 100644
--- a/test/cross.resp_error.test.js
+++ b/test/cross.resp_error.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/cross.token_migration.test.js b/test/cross.token_migration.test.js
index 14f24772..cb5f0af8 100644
--- a/test/cross.token_migration.test.js
+++ b/test/cross.token_migration.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/cross.unauthorised_event.test.js b/test/cross.unauthorised_event.test.js
index f04a6ce4..b52e6ec2 100644
--- a/test/cross.unauthorised_event.test.js
+++ b/test/cross.unauthorised_event.test.js
@@ -107,6 +107,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
diff --git a/test/interception.basic1.test.js b/test/interception.basic1.test.js
index 587d122a..4ec4a1ce 100644
--- a/test/interception.basic1.test.js
+++ b/test/interception.basic1.test.js
@@ -123,6 +123,7 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
                     await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
                     await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
                     await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
+                    await page.waitForFunction(() => window.supertokens !== undefined);
                     await new Promise(r => setTimeout(r, 100));
                 } catch {}
             }
@@ -218,7 +219,8 @@ addTestCases((name, transferMethod, setupFunc, setupArgs = []) => {
             await page.goto(BASE_URL + "/index.html", { waitUntil: "load" });
             await page.addScriptTag({ path: `./bundle/bundle.js`, type: "text/javascript" });
             await page.evaluate(BASE_URL => (window.BASE_URL = BASE_URL), BASE_URL);
-            await new Promise(r => setTimeout(r, 100));
+            await page.waitForFunction(() => window.supertokens !== undefined);
+            await new Promise(r => setTimeout(r, 250));
 
             await setup({
                 isInIframe: true