[vala/0.42] tests: Add "null-terminated array" delegate test to increase coverage

[Rico Tzschichholz <ricotz src gnome org>]

commit 0a3ae3c434d1a89315be1dac2c10c134629ccf8b
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Feb 23 20:19:31 2019 +0100

    tests: Add "null-terminated array" delegate test to increase coverage

 tests/Makefile.am                                 |  1 +
 tests/delegates/return-array-null-terminated.vala | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 51e71d2fd..b5fe150f8 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -235,6 +235,7 @@ TESTS = \
        delegates/fields-no-target.vala \
        delegates/instance-method-to-no-target.test \
        delegates/reference_transfer.vala \
+       delegates/return-array-null-terminated.vala \
        delegates/wrapper.vala \
        delegates/bug519949.test \
        delegates/bug539166.vala \
diff --git a/tests/delegates/return-array-null-terminated.vala 
b/tests/delegates/return-array-null-terminated.vala
new file mode 100644
index 000000000..8918b3e55
--- /dev/null
+++ b/tests/delegates/return-array-null-terminated.vala
@@ -0,0 +1,17 @@
+[CCode (has_target = false, array_length = false, array_null_terminated = true)]
+delegate string[] FooFunc ();
+
+[CCode (array_length = false, array_null_terminated = true)]
+string[] foo () {
+       return {"foo", "bar"};
+}
+
+void main () {
+       FooFunc f = foo;
+
+       {
+               var s = f ();
+               assert (s.length == 2);
+               assert (s[1] == "bar");
+       }
+}