1 files changed, 32 insertions, 0 deletions
diff --git a/library/std/src/sys/pal/unix/weak/tests.rs b/library/std/src/sys/pal/unix/weak/tests.rs
new file mode 100644
index 00000000000..d807ba64e35
--- /dev/null
+++ b/library/std/src/sys/pal/unix/weak/tests.rs
@@ -0,0 +1,32 @@
+use super::*;
+
+#[test]
+fn dlsym_existing() {
+    const TEST_STRING: &'static CStr = c"Ferris!";
+
+    // Try to find a symbol that definitely exists.
+    dlsym! {
+        fn strlen(cs: *const c_char) -> usize;
+    }
+
+    dlsym! {
+        #[link_name = "strlen"]
+        fn custom_name(cs: *const c_char) -> usize;
+    }
+
+    let strlen = strlen.get().unwrap();
+    assert_eq!(unsafe { strlen(TEST_STRING.as_ptr()) }, TEST_STRING.count_bytes());
+
+    let custom_name = custom_name.get().unwrap();
+    assert_eq!(unsafe { custom_name(TEST_STRING.as_ptr()) }, TEST_STRING.count_bytes());
+}
+
+#[test]
+fn dlsym_missing() {
+    // Try to find a symbol that definitely does not exist.
+    dlsym! {
+        fn test_symbol_that_does_not_exist() -> i32;
+    }
+
+    assert!(test_symbol_that_does_not_exist.get().is_none());
+}