Make puglRealize() always gracefully fail with a bad configuration

2 files changed, 10 insertions, 1 deletions

diff --git a/src/mac.m b/src/mac.m
index 2a54134..4f5c08f 100644
--- a/src/mac.m
+++ b/src/mac.m
@@ -1007,10 +1007,15 @@ PuglStatus
 puglRealize(PuglView* view)
 {
   PuglInternals* impl = view->impl;
+
   if (impl->wrapperView) {
     return PUGL_FAILURE;
   }
 
+  if (!view->backend || !view->backend->configure) {
+    return PUGL_BAD_BACKEND;
+  }
+
   const NSScreen* const screen      = [NSScreen mainScreen];
   const double          scaleFactor = [screen backingScaleFactor];
 
diff --git a/test/test_realize.c b/test/test_realize.c
index 50eba46..cf2cde6 100644
--- a/test/test_realize.c
+++ b/test/test_realize.c
@@ -65,9 +65,13 @@ main(int argc, char** argv)
   test.view = puglNewView(test.world);
   puglSetClassName(test.world, "PuglTest");
   puglSetWindowTitle(test.view, "Pugl Realize Test");
-  puglSetBackend(test.view, puglStubBackend());
   puglSetHandle(test.view, &test);
   puglSetEventFunc(test.view, onEvent);
+  assert(puglRealize(test.view) == PUGL_BAD_BACKEND);
+
+  puglSetBackend(test.view, puglStubBackend());
+  assert(puglRealize(test.view) == PUGL_BAD_CONFIGURATION);
+
   puglSetSizeHint(test.view, PUGL_DEFAULT_SIZE, 512, 512);
 
   // Create initially invisible window