1 files changed, 64 insertions, 0 deletions
diff --git a/third_party/rust/libloading/tests/windows.rs b/third_party/rust/libloading/tests/windows.rs
new file mode 100644
index 0000000000..b4aad4a698
--- /dev/null
+++ b/third_party/rust/libloading/tests/windows.rs
@@ -0,0 +1,64 @@
+#![cfg(windows)]
+extern crate libloading;
+use libloading::os::windows::*;
+use std::ffi::CStr;
+
+// The ordinal DLL contains exactly one function (other than DllMain, that is) with ordinal number
+// 1. This function has the sugnature `fn() -> *const c_char` and returns a string "bunny\0" (in
+// reference to WindowsBunny).
+//
+// Both x86_64 and x86 versions of the .dll are functionally the same. Ideally we would compile the
+// dlls with well known ordinals from our own testing helpers library, but rustc does not allow
+// specifying a custom .def file (https://github.com/rust-lang/rust/issues/35089)
+//
+// The DLLs were kindly compiled by WindowsBunny (aka. @retep998).
+
+#[cfg(target_arch="x86")]
+fn load_ordinal_lib() -> Library {
+    unsafe {
+        Library::new("tests/nagisa32.dll").expect("nagisa32.dll")
+    }
+}
+
+#[cfg(target_arch="x86_64")]
+fn load_ordinal_lib() -> Library {
+    unsafe {
+        Library::new("tests/nagisa64.dll").expect("nagisa64.dll")
+    }
+}
+
+#[cfg(any(target_arch="x86", target_arch="x86_64"))]
+#[test]
+fn test_ordinal() {
+    let lib = load_ordinal_lib();
+    unsafe {
+        let windows: Symbol<unsafe fn() -> *const i8> = lib.get_ordinal(1).expect("function");
+        assert_eq!(CStr::from_ptr(windows()).to_bytes(), b"bunny");
+    }
+}
+
+#[cfg(any(target_arch="x86", target_arch="x86_64"))]
+#[test]
+fn test_ordinal_missing_fails() {
+    let lib = load_ordinal_lib();
+    unsafe {
+        let r: Result<Symbol<unsafe fn() -> *const i8>, _> = lib.get_ordinal(2);
+        r.err().unwrap();
+        let r: Result<Symbol<unsafe fn() -> *const i8>, _> = lib.get_ordinal(!0);
+        r.err().unwrap();
+    }
+}
+
+#[test]
+fn test_new_kernel23() {
+    unsafe {
+        Library::new("kernel23").err().unwrap();
+    }
+}
+
+#[test]
+fn test_new_kernel32_no_ext() {
+    unsafe {
+        Library::new("kernel32").unwrap();
+    }
+}