Started writing tests for uiWindow.

darwin/window.m

@@ -446,6 +446,7 @@ const char *uiWindowTitle(uiWindow *w)
 	struct windowImplData *wi = (struct windowImplData *) uiControlImplData(uiControl(w));
 
 	if (wi->title == NULL)
+		// TODO replace this with a dedicated UTF-8 empty string object
 		return "";
 	return wi->title;
 }

test/meson.build

@@ -5,6 +5,7 @@ libui_test_sources = files([
 	'controls.c',
 	'initmain.c',
 	'noinitwrongthread.c',
+	'window.c',
 ])
 libui_allcalls_headers = files([
 	'allcalls.h',

test/window.c

@@ -0,0 +1,38 @@
+// 24 may 2020
+#include "test.h"
+
+Test(CannotMakeWindowAChild)
+{
+	uiWindow *a, *b;
+	void *ctx;
+
+	a = uiNewWindow();
+	b = uiNewWindow();
+
+	ctx = beginCheckProgrammerError("cannot set a uiWindow as the child of another uiControl");
+	uiControlSetParent(a, b);
+	// TODO this should not be necessary
+	uiControlSetParent(a, NULL);
+	endCheckProgrammerError(ctx);
+
+	uiControlFree(uiControl(b));
+	uiControlFree(uiControl(a));
+}
+
+Test(InitialWindowTitleIsEmptyString)
+{
+	uiWindow *w;
+	const char *title;
+
+	w = uiNewWindow();
+	title = uiWindowTitle(w);
+	// TODO have a utf8cmp()
+	if (*title != 0)
+		// TODO have a diffUTF8
+		TestErrorf("brand new uiWindow has wrong title:" diff("%s"),
+			title, "(empty string)");
+	uiControlFree(uiControl(w));
+}
+
+// TODO check that SetTitle works, and also that it sanitizes
+// TODO for all the above, check that the underlying title was also set appropriately