tests: add LocationService qml test cases

Add tst_qPrefLocationService qml file to test C++ qml connection

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

tests/tst_qPrefLocationService.qml

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+import QtQuick 2.6
+import QtTest 1.2
+import org.subsurfacedivelog.mobile 1.0
+
+TestCase {
+	name: "qPrefLocationService"
+
+	SsrfLocationServicePrefs {
+		id: tst
+	}
+
+	SsrfPrefs {
+		id: prefs
+	}
+
+	function test_variables() {
+		var x1 = tst.distance_threshold
+		tst.distance_threshold = 123
+		compare(tst.distance_threshold , 123)
+
+		var x2 = tst.time_threshold
+		tst.time_threshold = 12
+		compare(tst.time_threshold , 12)
+	}
+}