tests: add UpdateManager qml test cases

Add tst_qPrefUpdateManager qml file to test C++ qml connection

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

tests/tst_qPrefUpdateManager.qml

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+import QtQuick 2.6
+import QtTest 1.2
+import org.subsurfacedivelog.mobile 1.0
+
+TestCase {
+	name: "qPrefUpdateManager"
+
+	SsrfUpdateManagerPrefs {
+		id: tst
+	}
+
+	SsrfPrefs {
+		id: prefs
+	}
+
+	function test_variables() {
+		var x1 = tst.dont_check_for_updates
+		tst.dont_check_for_updates = true;
+		compare(tst.dont_check_for_updates, true)
+
+		var x2 = tst.dont_check_exists
+		tst.dont_check_exists = true
+		compare(tst.dont_check_exists, true)
+
+		var x3 = tst.last_version_used
+		tst.last_version_used = "jan again"
+		compare(tst.last_version_used, "jan again")
+
+		var x4 = tst.next_check
+		var x4_date = Date.fromLocaleString(Qt.locale(), "01-01-2001", "dd-MM-yyyy")
+		tst.next_check = x4_date
+		compare(tst.next_check,  x4_date)
+	}
+}