Vendor dependencies for 0.3.0 release

vendor/jni/tests/threads_detach.rs

@@ -0,0 +1,19 @@
+#![cfg(feature = "invocation")]
+
+use std::thread::spawn;
+
+mod util;
+use util::{attach_current_thread_permanently, call_java_abs, jvm};
+
+#[test]
+fn thread_detaches_when_finished() {
+    let thread = spawn(|| {
+        let mut env = attach_current_thread_permanently();
+        let val = call_java_abs(&mut env, -2);
+        assert_eq!(val, 2);
+        assert_eq!(jvm().threads_attached(), 1);
+    });
+
+    thread.join().unwrap();
+    assert_eq!(jvm().threads_attached(), 0);
+}