tests: add qPrefAnimations qml testcases

add test of qml C++ interface

Signed-off-by: Jan Iversen <jani@apache.org>

tests/testqml.cpp

@@ -8,7 +8,6 @@
 
 #include "core/settings/qPref.h"
 #include "core/qt-gui.h"
-#include "core/settings/qPrefDisplay.h"
 
 // this is the content of QUICK_TEST_MAIN amended with
 // registration of ssrf classes

tests/tst_qPrefAnimations.qml

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+import QtQuick 2.6
+import QtTest 1.2
+import org.subsurfacedivelog.mobile 1.0
+
+TestCase {
+	name: "qPrefAnimations"
+
+	SsrfAnimationsPrefs {
+		id: tst
+	}
+
+	function test_variables() {
+		var x1 = tst.animation_speed;
+		tst.animation_speed = 37
+		compare(tst.animation_speed, 37)
+	}
+
+}