1 files changed, 141 insertions, 0 deletions
diff --git a/t/roles/role_composition_errors.t b/t/roles/role_composition_errors.t
new file mode 100644
index 0000000..8fe9178
--- /dev/null
+++ b/t/roles/role_composition_errors.t
@@ -0,0 +1,141 @@
+use strict;
+use warnings;
+
+use Test::More;
+use Test::Fatal;
+
+
+{
+
+    package Foo::Role;
+    use Moose::Role;
+
+    requires 'foo';
+}
+
+is_deeply(
+    [ sort Foo::Role->meta->get_required_method_list ],
+    ['foo'],
+    '... the Foo::Role has a required method (foo)'
+);
+
+# classes which does not implement required method
+{
+
+    package Foo::Class;
+    use Moose;
+
+    ::isnt( ::exception { with('Foo::Role') }, undef, '... no foo method implemented by Foo::Class' );
+}
+
+# class which does implement required method
+{
+
+    package Bar::Class;
+    use Moose;
+
+    ::isnt( ::exception { with('Foo::Class') }, undef, '... cannot consume a class, it must be a role' );
+    ::is( ::exception { with('Foo::Role') }, undef, '... has a foo method implemented by Bar::Class' );
+
+    sub foo {'Bar::Class::foo'}
+}
+
+# role which does implement required method
+{
+
+    package Bar::Role;
+    use Moose::Role;
+
+    ::is( ::exception { with('Foo::Role') }, undef, '... has a foo method implemented by Bar::Role' );
+
+    sub foo {'Bar::Role::foo'}
+}
+
+is_deeply(
+    [ sort Bar::Role->meta->get_required_method_list ],
+    [],
+    '... the Bar::Role has not inherited the required method from Foo::Role'
+);
+
+# role which does not implement required method
+{
+
+    package Baz::Role;
+    use Moose::Role;
+
+    ::is( ::exception { with('Foo::Role') }, undef, '... no foo method implemented by Baz::Role' );
+}
+
+is_deeply(
+    [ sort Baz::Role->meta->get_required_method_list ],
+    ['foo'],
+    '... the Baz::Role has inherited the required method from Foo::Role'
+);
+
+# classes which does not implement required method
+{
+
+    package Baz::Class;
+    use Moose;
+
+    ::isnt( ::exception { with('Baz::Role') }, undef, '... no foo method implemented by Baz::Class2' );
+}
+
+# class which does implement required method
+{
+
+    package Baz::Class2;
+    use Moose;
+
+    ::is( ::exception { with('Baz::Role') }, undef, '... has a foo method implemented by Baz::Class2' );
+
+    sub foo {'Baz::Class2::foo'}
+}
+
+
+{
+    package Quux::Role;
+    use Moose::Role;
+
+    requires qw( meth1 meth2 meth3 meth4 );
+}
+
+# RT #41119
+{
+
+    package Quux::Class;
+    use Moose;
+
+    ::like( ::exception { with('Quux::Role') }, qr/\Q'Quux::Role' requires the methods 'meth1', 'meth2', 'meth3', and 'meth4' to be implemented by 'Quux::Class'/, 'exception mentions all the missing required methods at once' );
+}
+
+{
+    package Quux::Class2;
+    use Moose;
+
+    sub meth1 { }
+
+    ::like( ::exception { with('Quux::Role') }, qr/'Quux::Role' requires the methods 'meth2', 'meth3', and 'meth4' to be implemented by 'Quux::Class2'/, 'exception mentions all the missing required methods at once, but not the one that exists' );
+}
+
+{
+    package Quux::Class3;
+    use Moose;
+
+    has 'meth1' => ( is => 'ro' );
+    has 'meth2' => ( is => 'ro' );
+
+    ::like( ::exception { with('Quux::Role') }, qr/'Quux::Role' requires the methods 'meth3' and 'meth4' to be implemented by 'Quux::Class3'/, 'exception mentions all the missing methods at once, but not the accessors' );
+}
+
+{
+    package Quux::Class4;
+    use Moose;
+
+    sub meth1 { }
+    has 'meth2' => ( is => 'ro' );
+
+    ::like( ::exception { with('Quux::Role') }, qr/'Quux::Role' requires the methods 'meth3' and 'meth4' to be implemented by 'Quux::Class4'/, 'exception mentions all the require methods that are accessors at once, as well as missing methods, but not the one that exists' );
+}
+
+done_testing;