From 96b59dd5b2bd99cb1fe05463ec17c46492e7c5e6 Mon Sep 17 00:00:00 2001
From: "Dustin J. Mitchell" <dustin@v.igoro.us>
Date: Wed, 26 Jan 2022 01:38:25 +0000
Subject: [PATCH] serialize C integration tests

---
 Cargo.lock                          |  1 +
 integration-tests/Cargo.toml        |  1 +
 integration-tests/tests/bindings.rs | 10 ++++++++++
 3 files changed, 12 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index b2b905807..094b83445 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1529,6 +1529,7 @@ dependencies = [
  "anyhow",
  "cc",
  "env_logger 0.8.4",
+ "lazy_static",
  "log",
  "pretty_assertions",
  "taskchampion",
diff --git a/integration-tests/Cargo.toml b/integration-tests/Cargo.toml
index 71f39b6e6..2b4a3bd8a 100644
--- a/integration-tests/Cargo.toml
+++ b/integration-tests/Cargo.toml
@@ -18,6 +18,7 @@ tempfile = "3"
 pretty_assertions = "1"
 log = "^0.4.14"
 env_logger = "^0.8.3"
+lazy_static = "1"
 
 [build-dependencies]
 cc = "1.0"
diff --git a/integration-tests/tests/bindings.rs b/integration-tests/tests/bindings.rs
index d4574c92f..9f14ec47f 100644
--- a/integration-tests/tests/bindings.rs
+++ b/integration-tests/tests/bindings.rs
@@ -1,7 +1,17 @@
+use lazy_static::lazy_static;
+use std::sync::Mutex;
+
+lazy_static! {
+    // the C library running the tests is not reentrant, so we use a mutex to ensure that only one
+    // test runs at a time.
+    static ref MUTEX: Mutex<()> = Mutex::new(());
+}
+
 macro_rules! suite(
     { $s:ident } => {
     #[test]
     fn $s() {
+        let _guard = MUTEX.lock().unwrap();
         assert_eq!(integration_tests::bindings_tests::$s(), 0);
     }
     };