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diff --git a/subprojects/nk_pugl/pugl/test/test_update.c b/subprojects/nk_pugl/pugl/test/test_update.c
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+/*
+ Copyright 2020 David Robillard <http://drobilla.net>
+
+ Permission to use, copy, modify, and/or distribute this software for any
+ purpose with or without fee is hereby granted, provided that the above
+ copyright notice and this permission notice appear in all copies.
+
+ THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/*
+ Tests that update events are received and that the redisplays they trigger
+ happen immediately in the same event loop iteration.
+*/
+
+#undef NDEBUG
+
+#include "test_utils.h"
+
+#include "pugl/pugl.h"
+#include "pugl/pugl_stub.h"
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+#ifdef __APPLE__
+static const double timeout = 1 / 60.0;
+#else
+static const double timeout = -1.0;
+#endif
+
+typedef enum {
+ START,
+ EXPOSED1,
+ UPDATED,
+ EXPOSED2,
+} State;
+
+typedef struct {
+ PuglTestOptions opts;
+ PuglWorld* world;
+ PuglView* view;
+ State state;
+} PuglTest;
+
+static PuglStatus
+onEvent(PuglView* view, const PuglEvent* event)
+{
+ PuglTest* test = (PuglTest*)puglGetHandle(view);
+
+ if (test->opts.verbose) {
+ printEvent(event, "Event: ", true);
+ }
+
+ switch (event->type) {
+ case PUGL_EXPOSE:
+ switch (test->state) {
+ case START:
+ test->state = EXPOSED1;
+ break;
+ case UPDATED:
+ test->state = EXPOSED2;
+ break;
+ default:
+ break;
+ }
+ break;
+
+ case PUGL_UPDATE:
+ if (test->state == EXPOSED1) {
+ puglPostRedisplay(view);
+ test->state = UPDATED;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return PUGL_SUCCESS;
+}
+
+int
+main(int argc, char** argv)
+{
+ PuglTest app = {puglParseTestOptions(&argc, &argv),
+ puglNewWorld(PUGL_PROGRAM, 0),
+ NULL,
+ START};
+
+ // Set up view
+ app.view = puglNewView(app.world);
+ puglSetClassName(app.world, "Pugl Test");
+ puglSetBackend(app.view, puglStubBackend());
+ puglSetHandle(app.view, &app);
+ puglSetEventFunc(app.view, onEvent);
+
+ // Create and show window
+ assert(!puglCreateWindow(app.view, "Pugl Test"));
+ assert(!puglShowWindow(app.view));
+
+ // Tick until an expose happens
+ while (app.state < EXPOSED1) {
+ assert(!puglUpdate(app.world, timeout));
+ assert(app.state != UPDATED);
+ }
+
+ // Tick once and ensure the update and the expose it posted both happened
+ assert(!puglUpdate(app.world, 0.0));
+ assert(app.state == EXPOSED2);
+
+ // Tear down
+ puglFreeView(app.view);
+ puglFreeWorld(app.world);
+
+ return 0;
+}