And added (in a somewhat dirty for now way) the noinitwrongthread.c case for uiDarwinControlHandle().

test/allcalls_darwin.h

@@ -0,0 +1,5 @@
+// 28 may 2019
+
+// This file should NOT have include guards as it is intended to be included more than once; see noinitwrongthread_darwin.m for details.
+
+allcallsCase(uiDarwinControlHandle, NULL)

test/meson.build

@@ -17,8 +17,12 @@ if libui_OS == 'windows'
 elif libui_OS == 'darwin'
 	libui_test_sources += files([
 		'controls_darwin.m',
+		'noinitwrongthread_darwin.m',
 		'window_darwin.m',
 	])
+	libui_allcalls_headers += files([
+		'allcalls_darwin.h',
+	])
 elif libui_OS == 'haiku'
 	libui_test_sources += files([
 		'controls_haiku.c',

test/noinitwrongthread.c

@@ -2,6 +2,8 @@
 #include "test.h"
 #include "thread.h"
 
+// TODO split the macros in this file into its own file
+
 // TODO rename to FunctionsFailBeforeInit?
 #define allcallsCase(f, ...) \
 	TestNoInit(CallBeforeInitIsProgrammerError_ ## f) \

test/noinitwrongthread_darwin.m

@@ -0,0 +1,38 @@
+// 28 may 2019
+#import "test_darwin.h"
+#import "thread.h"
+
+// TODO rename to FunctionsFailBeforeInit?
+#define allcallsCase(f, ...) \
+	TestNoInit(CallBeforeInitIsProgrammerError_ ## f) \
+	{ \
+		void *ctx; \
+		ctx = beginCheckProgrammerError("attempt to call " #f "() before uiInit()"); \
+		f(__VA_ARGS__); \
+		endCheckProgrammerError(ctx); \
+	}
+#include "allcalls_darwin.h"
+#undef allcallsCase
+
+// TODO rename to FunctionsFailOnWrongThread?
+#define allcallsCase(f, ...) \
+	static void threadTest ## f(void *data) \
+	{ \
+		f(__VA_ARGS__); \
+	} \
+	Test(CallOnWrongThreadIsProgrammerError_ ## f) \
+	{ \
+		threadThread *thread; \
+		threadSysError err; \
+		void *ctx; \
+		ctx = beginCheckProgrammerError("attempt to call " #f "() on a thread other than the GUI thread"); \
+		err = threadNewThread(threadTest ## f, NULL, &thread); \
+		if (err != 0) \
+			TestFatalf("error creating thread: " threadSysErrorFmt, threadSysErrorFmtArg(err)); \
+		err = threadThreadWaitAndFree(thread); \
+		if (err != 0) \
+			TestFatalf("error waiting for thread to finish: " threadSysErrorFmt, threadSysErrorFmtArg(err)); \
+		endCheckProgrammerError(ctx); \
+	}
+#include "allcalls_darwin.h"
+#undef allcallsCase