[glib/wip/otte/interface-types: 443/448] Add more test for g_type_interface_instantiable_prerequisite

[Matthias Clasen <matthiasc src gnome org>]

commit a65d8d729795f8dde896d54a558295e44f7de092
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 12 15:27:37 2020 -0400

    Add more test for g_type_interface_instantiable_prerequisite
    
    Test that we return G_TYPE_INVALID if there's no instantiable
    prerequisite.

 gobject/tests/type.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
---
diff --git a/gobject/tests/type.c b/gobject/tests/type.c
index 9ed1806e9..ba4b70a23 100644
--- a/gobject/tests/type.c
+++ b/gobject/tests/type.c
@@ -40,6 +40,34 @@ foo_default_init (FooInterface *iface)
 {
 }
 
+typedef struct {
+  GTypeInterface g_iface;
+} BaaInterface;
+
+GType baa_get_type (void);
+
+G_DEFINE_INTERFACE (Baa, baa, G_TYPE_INVALID)
+
+static void
+baa_default_init (BaaInterface *iface)
+{
+}
+
+typedef struct {
+  GTypeInterface g_iface;
+} BooInterface;
+
+GType boo_get_type (void);
+
+G_DEFINE_INTERFACE_WITH_CODE (Boo, boo, G_TYPE_INVALID,
+                              g_type_interface_add_prerequisite (g_define_type_id, baa_get_type ()))
+
+static void
+boo_default_init (BooInterface *iface)
+{
+}
+
+
 static void
 test_interface_prerequisite (void)
 {
@@ -60,6 +88,9 @@ test_interface_prerequisite (void)
   g_type_default_interface_unref (iface);
 
   g_free (prereqs);
+
+  g_assert (g_type_interface_instantiable_prerequisite (baa_get_type ()) == G_TYPE_INVALID);
+  g_assert (g_type_interface_instantiable_prerequisite (boo_get_type ()) == G_TYPE_INVALID);
 }
 
 typedef struct {