add tests

these test will be determine what by default, absence of attribut in ability return no match
and what if value by default is specified in filter_ability then attribute empty = default_value.

data/test/scenarios/wml_tests/ScenarioWML/EventWML/events-test_filter_ability.cfg

@@ -296,3 +296,165 @@
 )}
 
 #undef FILTER_ABILITY_TEST
+
+#define FILTER_ABILITY_TEST_WITHOUT_VALUE
+    [event]
+        name=start
+        # Make sure the attacks hit
+        {FORCE_CHANCE_TO_HIT (id=bob) (id=alice) 100 ()}
+        {FORCE_CHANCE_TO_HIT (id=alice) (id=bob) 100 ()}
+        [modify_unit]
+            [filter]
+            [/filter]
+            # Make sure they don't die during the attacks
+            [status]
+                invulnerable=yes
+            [/status]
+        [/modify_unit]
+        [object]
+            silent=yes
+            [effect]
+                apply_to=new_ability
+                [abilities]
+                    [drains]
+                        [filter]
+                            [filter_location]
+                                time_of_day=neutral
+                            [/filter_location]
+                        [/filter]
+                    [/drains]
+                [/abilities]
+            [/effect]
+            [filter]
+                id=alice
+            [/filter]
+        [/object]
+        {VARIABLE triggers 0}
+    [/event]
+
+    [event]
+        name=side 1 turn 1
+        [do_command]
+            [move]
+                x=7,13
+                y=3,4
+            [/move]
+            [attack]
+                [source]
+                    x,y=13,4
+                [/source]
+                [destination]
+                    x,y=13,3
+                [/destination]
+            [/attack]
+        [/do_command]
+        [end_turn][/end_turn]
+    [/event]
+
+    [event]
+        name=side 2 turn
+        [do_command]
+            [attack]
+                [source]
+                    x,y=13,3
+                [/source]
+                [destination]
+                    x,y=13,4
+                [/destination]
+            [/attack]
+        [/do_command]
+        [end_turn][/end_turn]
+    [/event]
+#enddef
+
+#####
+# API(s) being tested: [event][filter][filter_ability]default_value
+##
+# Actions:
+# Use the common setup from FILTER_ABILITY_TEST_WITHOUT_VALUE.
+# Add an event with a filter matching Alice's drains ability.
+# Alice attacks Bob and then Bob attacks Alice, as defined in FILTER_ABILITY_TEST.
+##
+# Expected end state:
+# The filtered event is triggered exactly once.
+#####
+{GENERIC_UNIT_TEST event_test_filter_ability_without_value (
+    {FILTER_ABILITY_TEST_WITHOUT_VALUE}
+    [event]
+        name=attack
+        [filter]
+            [filter_ability]
+                tag_name=drains
+                value=10-45
+                default_value=25
+            [/filter_ability]
+        [/filter]
+        {ASSERT ({VARIABLE_CONDITIONAL side_number equals 1})}
+        {VARIABLE_OP triggers add 1}
+    [/event]
+    [event]
+        name=turn 2
+        {RETURN ({VARIABLE_CONDITIONAL triggers equals 1})}
+    [/event]
+)}
+
+#####
+# API(s) being tested: [event][filter][filter_ability]
+##
+# Actions:
+# Use the common setup from FILTER_ABILITY_TEST_WITHOUT_VALUE.
+# Add an event with a filter for a drains ability, but without default_value.
+# Alice attacks Bob and then Bob attacks Alice, as defined in FILTER_ABILITY_TEST_WITHOUT_VALUE.
+##
+# Expected end state:
+# The filtered event is never triggered.
+#####
+{GENERIC_UNIT_TEST event_test_filter_ability_no_match_without attribute (
+    {FILTER_ABILITY_TEST_WITHOUT_VALUE}
+    [event]
+        name=attack
+        [filter]
+            [filter_ability]
+                tag_name=drains
+                value=0-25
+            [/filter_ability]
+        [/filter]
+        {FAIL}
+    [/event]
+    [event]
+        name=turn 2
+        {SUCCEED}
+    [/event]
+)}
+
+#####
+# API(s) being tested: [event][filter][filter_ability]
+##
+# Actions:
+# Use the common setup from FILTER_ABILITY_TEST_WITHOUT_VALUE.
+# Add an event with a filter for a drains ability, but without different value.
+# Alice attacks Bob and then Bob attacks Alice, as defined in FILTER_ABILITY_TEST_WITHOUT_VALUE.
+##
+# Expected end state:
+# The filtered event is never triggered.
+#####
+{GENERIC_UNIT_TEST event_test_filter_ability_no_match_different_value (
+    {FILTER_ABILITY_TEST_WITHOUT_VALUE}
+    [event]
+        name=attack
+        [filter]
+            [filter_ability]
+                tag_name=drains
+                value=33
+                default_value=25
+            [/filter_ability]
+        [/filter]
+        {FAIL}
+    [/event]
+    [event]
+        name=turn 2
+        {SUCCEED}
+    [/event]
+)}
+
+#undef FILTER_ABILITY_TEST_WITHOUT_VALUE

wml_test_schedule

@@ -149,6 +149,9 @@
 0 event_test_filter_ability_no_match_neg_prefix
 0 event_test_filter_ability_active
 0 event_test_filter_ability_active_inactive
+0 event_test_filter_ability_without_value
+0 event_test_filter_ability_no_match_without attribute
+0 event_test_filter_ability_no_match_different_value
 0 test_ability_id_active
 0 test_ability_id_not_active
 0 event_test_filter_attack