Update test for exception in reading alarmed attr

If attribute was in ALARM state (e.g. due to max_value being exceeded)
and reading started to fail, the attribute should not impact Device
state any more (Device stays ON). If later reading starts to work again,
the Device shall also switch to ALARM state.

Author: mliszcz

cpp_test_suite/new_tests/cxx_attr_misc.cpp

@@ -1030,6 +1030,13 @@ cout << "status = " << status << endl;
 		TS_ASSERT(strcmp(status,"The device is in ON state.") == 0);
 	}
 
+	void set_Long_attr_value(DevLong value)
+	{
+		DeviceData input;
+		input << value;
+		TS_ASSERT_THROWS_NOTHING(device1->command_inout("IOSetAttr", input));
+	}
+
 	void set_attribute_exception_flag(short attribute_disc, bool enabled)
 	{
 		std::vector<short> flags(2);
@@ -1062,14 +1069,16 @@ cout << "status = " << status << endl;
 	{
 		const short EXCEPTION_IN_Long_attr = 5;
 
-		assert_dev_state(Tango::ON);
+		set_Long_attr_value(2000);
+		assert_dev_state(Tango::ALARM);
 
 		set_attribute_exception_flag(EXCEPTION_IN_Long_attr, true);
-
 		assert_dev_state(Tango::ON);
 
 		set_attribute_exception_flag(EXCEPTION_IN_Long_attr, false);
+		assert_dev_state(Tango::ALARM);
 
+		set_Long_attr_value(1200);
 		assert_dev_state(Tango::ON);
 	}