Add a test for an issue which I believe is caused by failure to identify

an asynchronous method.

Unfortunately I am unable to actually produce a failing test; instead an
exception message is generated during test execution. This seems to be an
issue with the test runner mechanism.

tests/src/test/java/org/teavm/vm/VMTest.java

@@ -167,6 +167,13 @@ public class VMTest {
         assertEquals("ok", acl.instanceState);
     }
 
+    @Test
+    public void asyncWait() {
+        AsyncClinitClass acl = new AsyncClinitClass();
+        acl.doWait();
+        assertEquals("ok", acl.instanceState);
+    }
+
     @Test
     @SkipJVM
     public void loopAndExceptionPhi() {
@@ -249,8 +256,23 @@ public class VMTest {
             instanceState += "ok";
             try {
                 Thread.sleep(1);
+            } catch (InterruptedException ie) {
+                throw new RuntimeException(ie);
             }
-            catch (InterruptedException ie) {
+        }
+
+        public synchronized void doWait() {
+            new Thread(() -> {
+                synchronized (AsyncClinitClass.this) {
+                    notify();
+                }
+            }).start();
+
+            try {
+                Thread.sleep(1);
+                wait();
+            } catch (InterruptedException ie) {
+                instanceState = "error";
                 throw new RuntimeException(ie);
             }
         }