fix(tests): add serial_test to fix race conditions in integration tests

Integration tests were failing due to mutex poisoning when tests ran
in parallel. Added serial_test crate to ensure tests that use shared
ScreenCaptureKit resources run sequentially.

- Add serial_test dev-dependency
- Add #[serial] attribute to all integration tests
- All tests now pass

Author: 1313

Cargo.toml

@@ -42,3 +42,4 @@ macos_15_0 = ["macos_14_4"]
 [dev-dependencies]
 png = "0.17"
 tokio = { version = "1.40", features = ["sync", "rt", "rt-multi-thread", "macros", "test-util"] }
+serial_test = "3"

tests/integration_tests.rs

@@ -1,4 +1,6 @@
 #![allow(clippy::pedantic, clippy::nursery)]
+// Integration tests must run serially due to shared ScreenCaptureKit resources
+
 use screencapturekit::{
     shareable_content::SCShareableContent,
     stream::{
@@ -10,6 +12,7 @@ use screencapturekit::{
     },
     CMSampleBuffer,
 };
+use serial_test::serial;
 use std::sync::{Arc, Mutex};
 use std::time::Duration;
 
@@ -44,6 +47,7 @@ impl SCStreamOutputTrait for AudioTestOutput {
 }
 
 #[test]
+#[serial]
 fn test_video_capture() {
     // Get shareable content
     let content = match SCShareableContent::get() {
@@ -121,6 +125,7 @@ fn test_video_capture() {
 }
 
 #[test]
+#[serial]
 fn test_audio_capture() {
     // Get shareable content
     let content = match SCShareableContent::get() {
@@ -200,6 +205,7 @@ fn test_audio_capture() {
 }
 
 #[test]
+#[serial]
 fn test_video_and_audio_capture() {
     // Get shareable content
     let content = match SCShareableContent::get() {
@@ -276,6 +282,7 @@ fn test_video_and_audio_capture() {
 }
 
 #[test]
+#[serial]
 fn test_pixel_buffer_locking() {
     // Get shareable content
     let content = match SCShareableContent::get() {
@@ -362,6 +369,7 @@ fn test_pixel_buffer_locking() {
 }
 
 #[test]
+#[serial]
 fn test_iosurface_backed_buffer() {
     // Get shareable content
     let content = match SCShareableContent::get() {