[vala] tests: Add async constructor test

[Rico Tzschichholz <ricotz src gnome org>]

commit f8fba4c0f2aec7a4fa01993f94be0f797adfe0b5
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Sep 24 13:02:48 2016 +0200

    tests: Add async constructor test
    
    https://bugzilla.gnome.org/show_bug.cgi?id=659886

 tests/Makefile.am                 |    1 +
 tests/asynchronous/bug659886.vala |   14 ++++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index b2caa77..e5c2301 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -199,6 +199,7 @@ TESTS = \
        asynchronous/bug653861.vala \
        asynchronous/bug654336.vala \
        asynchronous/bug654337.vala \
+       asynchronous/bug659886.vala \
        asynchronous/bug661961.vala \
        asynchronous/bug742621.vala \
        asynchronous/closures.vala \
diff --git a/tests/asynchronous/bug659886.vala b/tests/asynchronous/bug659886.vala
new file mode 100644
index 0000000..39f48e5
--- /dev/null
+++ b/tests/asynchronous/bug659886.vala
@@ -0,0 +1,14 @@
+class Foo : Object {
+       public async Foo () {
+               Object ();
+       }
+}
+
+Foo f;
+
+public async void bar () {
+       f = yield new Foo ();
+}
+
+void main () {
+}