[vala/staging] tests: Add "unique namespace" test

[Rico Tzschichholz <ricotz src gnome org>]

commit 14cf269d58915c9f3c26155729807e241656790c
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Jul 8 22:57:56 2020 +0200

    tests: Add "unique namespace" test
    
    A namespace symbol is unique for a given name in its CodeContext. This
    means attributes are inherited accross all occurances.

 tests/Makefile.am           |  1 +
 tests/namespace/unique.vala | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 7d604cfbe..3867108ca 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -77,6 +77,7 @@ TESTS = \
        basic-types/bug788775.vala \
        constants/array-type-invalid.test \
        constants/glog.vala \
+       namespace/unique.vala \
        arrays/cast-silent-invalid.test \
        arrays/class-field-length-cname.vala \
        arrays/constant-element-access.vala \
diff --git a/tests/namespace/unique.vala b/tests/namespace/unique.vala
new file mode 100644
index 000000000..3ae410873
--- /dev/null
+++ b/tests/namespace/unique.vala
@@ -0,0 +1,16 @@
+namespace GLib {
+       public class ValaFoo {
+       }
+
+       public int vala_foo () {
+               return 42;
+       }
+}
+
+[CCode (cname = "g_vala_foo", cheader_filename = "glib.h")]
+extern int vala_foo ();
+
+void main () {
+       assert (vala_foo () == 42);
+       assert (typeof (ValaFoo).name () == "GValaFoo");
+}