Add tests for ASYNC deferral.

Author: python-processing-unit

tests/cases/passing/pause-async-deferred-arg.pre

@@ -0,0 +1,16 @@
+BOOL: released = FALSE
+
+THR: paused = PAUSE(ASYNC{
+    WHILE(NOT(released)){}
+}, seconds = 0d0.05)
+
+ASSERT(EQ(TYPE(paused), "THR"))
+ASSERT(BOOL(paused))
+ASSERT(PAUSED(paused))
+
+released = TRUE
+
+AWAIT(paused)
+
+ASSERT(NOT(BOOL(paused)))
+ASSERT(NOT(PAUSED(paused)))

tests/cases/passing/stop-async-deferred-arg.pre

@@ -0,0 +1,10 @@
+BOOL: reached_end = FALSE
+
+THR: stopped = STOP(ASYNC{
+    FOR(i, 0d100000){}
+    reached_end = TRUE
+})
+
+ASSERT(EQ(TYPE(stopped), "THR"))
+ASSERT(NOT(BOOL(stopped)))
+ASSERT(EQ(reached_end, FALSE))