diff --git a/tests/call_js_from_v_test.v b/tests/call_js_from_v_test.v
index afa54be..10c44a3 100644
--- a/tests/call_js_from_v_test.v
+++ b/tests/call_js_from_v_test.v
@@ -19,15 +19,20 @@ fn test_js_fn_call() {
 		await webui.call("close_window")
 	}'
 	// Show window, wait for it to be recognized as shown.
-	w.show(utils.gen_html(@FN, script),
-		await: true
-	) or { assert false, err.str() }
+	w.show(utils.gen_html(@FN, script), await: true) or { assert false, err.str() }
 
 	// We call `w.close()` from the last V function that is called from JS.
 	// Ensure that it closes, otherwise the test can run infinitely. Timeout after 1min.
-	if !utils.timeout(30, fn [w] () bool {
-		return !w.is_shown()
-	}) {
-		assert false, 'Timeout while waiting for JS to call V.'
-	}
+	spawn fn [w] () {
+		if !utils.timeout(30, fn [w] () bool {
+			return !w.is_shown()
+		}) {
+			assert false, 'Timeout while waiting for JS to call V.'
+			exit(1)
+		}
+	}()
+}
+
+fn test_run_wait() {
+	ui.wait() // Call wait once at the end of all tests.
 }
diff --git a/tests/call_v_from_js_test.v b/tests/call_v_from_js_test.v
index e8cf7dd..9aa9e90 100644
--- a/tests/call_v_from_js_test.v
+++ b/tests/call_v_from_js_test.v
@@ -20,16 +20,16 @@ fn test_v_fn_call() {
 	}, 500)'
 
 	// Show window, wait for it to be recognized as shown.
-	w.show(utils.gen_html(@FN, script),
-		await: true
-	) or { assert false, err.str() }
+	w.show(utils.gen_html(@FN, script), await: true) or { assert false, err.str() }
 
 	// Wait for v_fn to be called.
-	if !utils.timeout(30, fn [mut app] () bool {
-		return app.fn_was_called
-	}) {
-		assert false, 'Timeout while waiting for JS to call V.'
-	}
+	spawn fn [mut app] () {
+		if !utils.timeout(30, fn [mut app] () bool {
+			return app.fn_was_called
+		}) {
+			assert false, 'Timeout while waiting for JS to call V.'
+		}
+	}()
 }
 
 struct Person {
@@ -80,11 +80,13 @@ fn test_get_js_arg() {
 
 	// We call `w.close()` from the last V function that is called from JS.
 	// Ensure that it closes, otherwise the test can run infinitely. Timeout after 1min.
-	if !utils.timeout(60, fn [w] () bool {
-		return !w.is_shown()
-	}) {
-		assert false, 'Timeout while waiting JS calling V.'
-	}
+	spawn fn [w] () {
+		if !utils.timeout(60, fn [w] () bool {
+			return !w.is_shown()
+		}) {
+			assert false, 'Timeout while waiting JS calling V.'
+		}
+	}()
 }
 
 // V function bound to JS callback in next tests
@@ -117,11 +119,13 @@ fn test_get_js_arg_at_idx() {
 		await: true
 	) or { assert false, err.str() }
 
-	if !utils.timeout(60, fn [w] () bool {
-		return !w.is_shown()
-	}) {
-		assert false, 'Timeout while waiting JS calling V.'
-	}
+	spawn fn [w] () {
+		if !utils.timeout(60, fn [w] () bool {
+			return !w.is_shown()
+		}) {
+			assert false, 'Timeout while waiting JS calling V.'
+		}
+	}()
 }
 
 fn test_return_value_to_js() {
@@ -160,9 +164,16 @@ fn test_return_value_to_js() {
 		await: true
 	) or { assert false, err.str() }
 
-	if !utils.timeout(60, fn [w] () bool {
-		return !w.is_shown()
-	}) {
-		assert false, 'Timeout while waiting JS calling V.'
-	}
+	spawn fn [w] () {
+		if !utils.timeout(60, fn [w] () bool {
+			return !w.is_shown()
+		}) {
+			assert false, 'Timeout while waiting JS calling V.'
+			exit(1)
+		}
+	}()
+}
+
+fn test_run_wait() {
+	ui.wait() // Call wait once at the end of the test.
 }
diff --git a/tests/thread_gc_test.v b/tests/thread_gc_test.v
index c3db9c2..8f2858c 100644
--- a/tests/thread_gc_test.v
+++ b/tests/thread_gc_test.v
@@ -49,9 +49,16 @@ fn test_thread_gc() {
 	) or { assert false, err.str() }
 
 	log.info('> w.is_shown: ${w.is_shown()}')
-	if !utils.timeout(30, fn [mut app] () bool {
-		return app.fn_was_called
-	}) {
-		assert false, 'Timeout while waiting for the v binded callback to be called'
-	}
+	spawn fn [mut app] () {
+		if !utils.timeout(30, fn [mut app] () bool {
+			return app.fn_was_called
+		}) {
+			assert false, 'Timeout while waiting for the V callback to be called'
+			exit(1)
+		}
+	}()
+}
+
+fn test_run_wait() {
+	ui.wait() // Call wait once at the end of all tests.
 }
diff --git a/tests/window_close_test.v b/tests/window_close_test.v
index 98ad48f..def5570 100644
--- a/tests/window_close_test.v
+++ b/tests/window_close_test.v
@@ -7,12 +7,7 @@ fn test_window_close() {
 
 	// Wait for the window to show
 	ui.set_timeout(30)
-	w.show('<html style="background: #654da9; color: #eee">
-<head><script src="webui.js"></script></head>
-<body><samp>${@FN}</samp></body>
-</html>') or {
-		assert false, err.str()
-	}
+	w.show(utils.gen_html(@FN, '')) or { assert false, err.str() }
 	for i in 0 .. 30 {
 		if w.is_shown() {
 			break
@@ -25,9 +20,15 @@ fn test_window_close() {
 
 	w.close()
 	// Wait for the window to close
-	if !utils.timeout(10, fn [w] () bool {
-		return !w.is_shown()
-	}) {
-		assert false, 'Failed closing window.'
-	}
+	spawn fn [w] () {
+		if !utils.timeout(10, fn [w] () bool {
+			return !w.is_shown()
+		}) {
+			assert false, 'Failed closing window.'
+		}
+	}()
+}
+
+fn test_run_wait() {
+	ui.wait() // Call wait once at the end of all tests.
 }