Add test cases for cousin imports that break due to aliases starting with two underscores

betterproto/tests/inputs/config.py

@@ -16,6 +16,9 @@ tests = {
 packages = {
     "import_root_package_from_child": ".child",
     "import_parent_package_from_child": ".parent.child",
+    "import_root_package_from_nested_child": ".nested.child",
+    "import_cousin_package": ".test.subpackage",
+    "import_cousin_package_same_name": ".test.subpackage",
     "repeatedmessage": ".repeatedmessage",
     "service": ".service",
 }

betterproto/tests/inputs/import_cousin_package/cousin.proto

@@ -0,0 +1,6 @@
+syntax = "proto3";
+
+package cousin.cousin_subpackage;
+
+message CousinMessage {
+}

betterproto/tests/inputs/import_cousin_package/test.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package test.subpackage;
+
+import "cousin.proto";
+
+// Verify that we can import message unrelated to us
+
+message Test {
+    cousin.cousin_subpackage.CousinMessage message = 1;
+}

betterproto/tests/inputs/import_cousin_package_same_name/cousin.proto

@@ -0,0 +1,6 @@
+syntax = "proto3";
+
+package cousin.subpackage;
+
+message CousinMessage {
+}

betterproto/tests/inputs/import_cousin_package_same_name/test.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package test.subpackage;
+
+import "cousin.proto";
+
+// Verify that we can import a message unrelated to us, in a subpackage with the same name as us.
+
+message Test {
+    cousin.subpackage.CousinMessage message = 1;
+}