Add test for max alarm change below current value

Test for changing alarm treshold to value lower than currently read from
hardware. Attribute should have alarm quality after property change.

Author: mliszcz

cpp_test_suite/new_tests/cxx_attr_misc.cpp

@@ -1078,6 +1078,30 @@ cout << "status = " << status << endl;
 #undef QUOTE
 #undef __QUOTE
 
+/*
+ * Test for changing alarm treshold to value lower than currently read from
+ * hardware. Attribute should have alarm quality after property change.
+ */
+
+    void test_change_max_alarm_threshold_below_current_value()
+    {
+        const char* attr_name = "Short_attr_rw";
+        const DevShort attr_value = 20;
+
+        DeviceAttribute value(attr_name, attr_value);
+        TS_ASSERT_THROWS_NOTHING(device1->write_attribute(value));
+
+        TS_ASSERT_EQUALS(Tango::ON, device1->state());
+        TS_ASSERT_EQUALS(Tango::ATTR_VALID, device1->read_attribute(attr_name).get_quality());
+
+        auto config = device1->get_attribute_config(attr_name);
+        config.alarms.max_alarm = std::to_string(attr_value - 1);
+        AttributeInfoListEx config_in = { config };
+        TS_ASSERT_THROWS_NOTHING(device1->set_attribute_config(config_in));
+
+        TS_ASSERT_EQUALS(Tango::ALARM, device1->state());
+        TS_ASSERT_EQUALS(Tango::ATTR_ALARM, device1->read_attribute(attr_name).get_quality());
+    }
 };
 #undef cout
 #endif // AttrMiscTestSuite_h