diff --git a/tests/language_2/language_2_analyzer.status b/tests/language_2/language_2_analyzer.status
index 851c4d47a17..c15bd6e030a 100644
--- a/tests/language_2/language_2_analyzer.status
+++ b/tests/language_2/language_2_analyzer.status
@@ -74,11 +74,9 @@ issue31596_super_test/none: CompileTimeError
 issue31596_tearoff_test: CompileTimeError
 issue31596_test: CompileTimeError
 malformed2_test: Pass, MissingCompileTimeError # Issue 31056.
-mixin_declaration/mixin_declaration_invalid_application_supertype_test/none: CompileTimeError # test issue: Expect.isNotType is not defined
-mixin_declaration/mixin_declaration_invalid_override_test/none: CompileTimeError # test issue: A5Foo is abstract
 mixin_declaration/mixin_declaration_invalid_superinvocation_test/none: CompileTimeError # bug in analyzer? Exchange UnaryNum, UnaryOptionalNum, and it works.
-mixin_declaration/mixin_declaration_subtype_test: CompileTimeError # test issue: missing formal parameters
-mixin_declaration/mixin_declaration_superinvocation_application_test/none: CompileTimeError # test issue: class missing
+mixin_declaration/mixin_declaration_subtype_test: CompileTimeError
+mixin_declaration/mixin_declaration_superinvocation_application_test/05: MissingCompileTimeError
 mixin_declaration/mixin_declaration_supertype_compatible_test/04: MissingCompileTimeError # no most specific signature
 mixin_declaration/mixin_declaration_syntax_test: CompileTimeError # test issue: many of them
 mixin_forwarding_constructor4_test/01: CompileTimeError # See issue 15101
diff --git a/tests/language_2/mixin_declaration/mixin_declaration_invalid_application_supertype_test.dart b/tests/language_2/mixin_declaration/mixin_declaration_invalid_application_supertype_test.dart
index ae44baad1bd..584003c6293 100644
--- a/tests/language_2/mixin_declaration/mixin_declaration_invalid_application_supertype_test.dart
+++ b/tests/language_2/mixin_declaration/mixin_declaration_invalid_application_supertype_test.dart
@@ -28,6 +28,6 @@ class _ = UnaryNum with M2;  //# 05: compile-time error
 
 main() {
   // M1 and M2 are valid types.
-  Expect.isNotType<M1>(null);
-  Expect.isNotType<M2>(null);
+  Expect.notType<M1>(null);
+  Expect.notType<M2>(null);
 }
diff --git a/tests/language_2/mixin_declaration/mixin_declaration_invalid_override_test.dart b/tests/language_2/mixin_declaration/mixin_declaration_invalid_override_test.dart
index 3b992310259..be0ace3bb72 100644
--- a/tests/language_2/mixin_declaration/mixin_declaration_invalid_override_test.dart
+++ b/tests/language_2/mixin_declaration/mixin_declaration_invalid_override_test.dart
@@ -59,6 +59,8 @@ abstract class A5Foo = C5Foo with M5;
 // Invalid since super-invocaton of foo does not hit concrete implementation.
 abstract class _ = C5Bar with M5;  //# 08: compile-time error
 
+class A5FooConcrete = A5Foo with C5Bar;
+
 main() {
-  Expect.equals(42, A5Foo().baz(42));
+  Expect.equals(42, A5FooConcrete().baz(42));
 }
\ No newline at end of file
diff --git a/tests/language_2/mixin_declaration/mixin_declaration_invalid_type_test.dart b/tests/language_2/mixin_declaration/mixin_declaration_invalid_type_test.dart
index 712538a7c6b..0fad558482d 100644
--- a/tests/language_2/mixin_declaration/mixin_declaration_invalid_type_test.dart
+++ b/tests/language_2/mixin_declaration/mixin_declaration_invalid_type_test.dart
@@ -46,4 +46,4 @@ main() {}
 // Just to have some types.
 class A {}
 class B {}
-typedef FuntType = int Function(int);
\ No newline at end of file
+typedef FuntType = int Function(int);
diff --git a/tests/language_2/mixin_declaration/mixin_declaration_subtype_test.dart b/tests/language_2/mixin_declaration/mixin_declaration_subtype_test.dart
index 7322dabc0a9..ecc9347b7e4 100644
--- a/tests/language_2/mixin_declaration/mixin_declaration_subtype_test.dart
+++ b/tests/language_2/mixin_declaration/mixin_declaration_subtype_test.dart
@@ -30,13 +30,13 @@ class GC<T> implements GA<T>, GB<List<T>> {}
 
 class GD<T> = GC<T> with GM<T>;
 
-bool expectSubtype<Sub, Super> {
+bool expectSubtype<Sub, Super>() {
   if (<Sub>[] is! List<Super>) {
     Expect.fail("$Sub is not a subtype of $Super");
   }
 }
 
-bool expectNotSubtype<Sub, Super> {
+bool expectNotSubtype<Sub, Super>() {
   if (<Sub>[] is List<Super>) {
     Expect.fail("$Sub is a subtype of $Super");
   }
diff --git a/tests/language_2/mixin_declaration/mixin_declaration_superinvocation_application_test.dart b/tests/language_2/mixin_declaration/mixin_declaration_superinvocation_application_test.dart
index 52c67bbca18..1a0775961c7 100644
--- a/tests/language_2/mixin_declaration/mixin_declaration_superinvocation_application_test.dart
+++ b/tests/language_2/mixin_declaration/mixin_declaration_superinvocation_application_test.dart
@@ -37,7 +37,7 @@ class C1 {
   num foo(num x) => x;
 }
 
-abstract C2 extends C1 implements UnaryOptionalNum {
+abstract class C2 extends C1 implements UnaryOptionalNum {
   num foo([num x]);
 }
 
@@ -57,6 +57,6 @@ class A2 extends C2 //
 }
 
 main() {
-  A1().bar();
-  A2().bar();
+  A1().bar(); //# 04: continued
+  A2().bar(); //# 05: continued
 }
\ No newline at end of file