1 files changed, 47 insertions, 0 deletions
diff --git a/extra/git2/tests/global_state.rs b/extra/git2/tests/global_state.rs
new file mode 100644
index 000000000..192acdbd3
--- /dev/null
+++ b/extra/git2/tests/global_state.rs
@@ -0,0 +1,47 @@
+//! Test for some global state set up by libgit2's `git_libgit2_init` function
+//! that need to be synchronized within a single process.
+
+use git2::opts;
+use git2::{ConfigLevel, IntoCString};
+
+// Test for mutating configuration file search path which is set during
+// initialization in libgit2's `git_sysdir_global_init` function.
+#[test]
+fn search_path() -> Result<(), Box<dyn std::error::Error>> {
+    use std::env::join_paths;
+
+    let path = "fake_path";
+    let original = unsafe { opts::get_search_path(ConfigLevel::Global) };
+    assert_ne!(original, Ok(path.into_c_string()?));
+
+    // Set
+    unsafe {
+        opts::set_search_path(ConfigLevel::Global, &path)?;
+    }
+    assert_eq!(
+        unsafe { opts::get_search_path(ConfigLevel::Global) },
+        Ok(path.into_c_string()?)
+    );
+
+    // Append
+    let paths = join_paths(["$PATH", path].iter())?;
+    let expected_paths = join_paths([path, path].iter())?.into_c_string()?;
+    unsafe {
+        opts::set_search_path(ConfigLevel::Global, paths)?;
+    }
+    assert_eq!(
+        unsafe { opts::get_search_path(ConfigLevel::Global) },
+        Ok(expected_paths)
+    );
+
+    // Reset
+    unsafe {
+        opts::reset_search_path(ConfigLevel::Global)?;
+    }
+    assert_eq!(
+        unsafe { opts::get_search_path(ConfigLevel::Global) },
+        original
+    );
+
+    Ok(())
+}