Add language_2 tests demonstrating bug #30568

tests/language_2/language_2_analyzer.status

Index: tests/language_2/language_2_analyzer.status
diff --git a/tests/language_2/language_2_analyzer.status b/tests/language_2/language_2_analyzer.status
index 133134b629eb6f26c3ba2241ef6bec789381c830..8d2194fe2a04b2b0a1001b0019c695139ede212d 100644
--- a/tests/language_2/language_2_analyzer.status
+++ b/tests/language_2/language_2_analyzer.status
@@ -181,6 +181,8 @@ getter_override_test/03: MissingCompileTimeError
 getters_setters2_test/02: MissingCompileTimeError
 
 [ $compiler == dart2analyzer ]
+abstract_override_adds_optional_args_concrete_subclass_test: MissingCompileTimeError # Issue #30568
+abstract_override_adds_optional_args_concrete_test: MissingCompileTimeError # Issue #30568
 async_return_types_test/nestedFuture: MissingCompileTimeError
 bad_initializer1_negative_test: CompileTimeError # Issue 14529
 bad_initializer2_negative_test: fail # Issue 14880
@@ -211,6 +213,7 @@ accessor_conflict_import2_test: CompileTimeError # Issue 25626
 accessor_conflict_import_prefixed2_test: CompileTimeError # Issue 25626
 accessor_conflict_import_prefixed_test: CompileTimeError # Issue 25626
 accessor_conflict_import_test: CompileTimeError # Issue 25626
+additional_interface_adds_optional_args_test: CompileTimeError # Issue #30568
 async_return_types_test/nestedFuture: MissingCompileTimeError
 bit_operations_test/01: MissingStaticWarning # Issue 28823
 bit_operations_test/02: MissingStaticWarning # Issue 28823
@@ -283,6 +286,9 @@ accessor_conflict_import2_test: StaticWarning # Issue 25626
 accessor_conflict_import_prefixed2_test: StaticWarning # Issue 25626
 accessor_conflict_import_prefixed_test: StaticWarning # Issue 25626
 accessor_conflict_import_test: StaticWarning # Issue 25626
+additional_interface_adds_optional_args_concrete_subclass_test: MissingCompileTimeError
+additional_interface_adds_optional_args_concrete_test: MissingCompileTimeError
+additional_interface_adds_optional_args_test: StaticWarning
 cast_test/04: MissingCompileTimeError
 cast_test/05: MissingCompileTimeError
 checked_null_test/01: MissingCompileTimeError