diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/Direction.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/Direction.proto
deleted file mode 100644
index ca614a16ea6..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/Direction.proto
+++ /dev/null
@@ -1,21 +0,0 @@
-syntax = "proto3";
-package carkot;
-
-option java_package = "proto.car";
-option java_outer_classname = "Direction";
-
-message DirectionRequest {
-    enum Command {
-        stop = 0;
-        forward = 1;
-        backward = 2;
-        left = 3;
-        right = 4;
-    }
-    Command command = 1;
-}
-
-message DirectionResponse {
-    int32 code = 1;
-    string errorMsg = 2;
-}
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/addressbook.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/addressbook.proto
deleted file mode 100644
index 35bb149cd54..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/addressbook.proto
+++ /dev/null
@@ -1,49 +0,0 @@
-// See README.txt for information and build instructions.
-//
-// Note: START and END tags are used in comments to define sections used in
-// tutorials.  They are not part of the syntax for Protocol Buffers.
-//
-// To get an in-depth walkthrough of this file and the related examples, see:
-// https://developers.google.com/protocol-buffers/docs/tutorials
-
-// [START declaration]
-syntax = "proto3";
-package tutorial;
-// [END declaration]
-
-// [START java_declaration]
-option java_package = "com.example.tutorial";
-option java_outer_classname = "AddressBookProtos";
-// [END java_declaration]
-
-// [START csharp_declaration]
-option csharp_namespace = "Google.Protobuf.Examples.AddressBook";
-// [END csharp_declaration]
-
-// [START messages]
-message Person {
-  string name = 1;
-  int32 id = 2;  // Unique ID number for this person.
-  string email = 3;
-
-  enum PhoneType {
-    MOBILE = 0;
-    HOME = 1;
-    WORK = 2;
-  }
-
-  message PhoneNumber {
-    string number = 1;
-    PhoneType type = 2;
-  }
-
-  repeated PhoneNumber phones = 4;
-
-  bytes someBytes = 5;
-}
-
-// Our address book file is just one of these.
-message AddressBook {
-  repeated Person people = 1;
-}
-// [END messages]
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/base.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/base.proto
deleted file mode 100644
index 76b0f632c1e..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/base.proto
+++ /dev/null
@@ -1,6 +0,0 @@
-syntax = "proto3";
-
-message SomeMessage {
-	string stringField = 1;
-	int32 int32Field = 2;
-}
\ No newline at end of file
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/cross-branch-access.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/cross-branch-access.proto
deleted file mode 100644
index 6afa75ac85d..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/cross-branch-access.proto
+++ /dev/null
@@ -1,24 +0,0 @@
-syntax = "proto3";
-
-message Grandfather {
-	message FatherLeft {
-		message SonLeftLeft {
-			FatherLeft father = 1;
-			Grandfather.FatherRight.SonRightLeft brother = 2;
-		}
-
-		message SonLeftRight {
-			string foo = 3;
-		}
-	}
-
-	message FatherRight {
-		message SonRightLeft {
-			string bar = 4;
-		}
-
-		message SonRightRight {
-			Grandfather.FatherLeft.SonLeftRight brother = 5;
-		}
-	}
-}
\ No newline at end of file
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/error.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/error.proto
deleted file mode 100644
index 6e4e1a4f6f4..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/error.proto
+++ /dev/null
@@ -1,10 +0,0 @@
-syntax = "proto3";
-package carkot;
-
-option java_package = "proto.car";
-option java_outer_classname = "ErrorP";
-
-message Error {
-    string errorMessage = 1;
-    int32 errorCode = 2;
-}
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/extended.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/extended.proto
deleted file mode 100644
index 8208f45012f..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/extended.proto
+++ /dev/null
@@ -1,8 +0,0 @@
-syntax = "proto3";
-
-message ExtendedMessage {
-	string stringField = 1;
-	int32 int32Field = 2;
-	double doubleField = 3;
-	bytes bytesField = 4;
-}
\ No newline at end of file
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/nested-msg.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/nested-msg.proto
deleted file mode 100644
index f52084e67f0..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/nested-msg.proto
+++ /dev/null
@@ -1,14 +0,0 @@
-syntax = "proto3";
-
-message Level1 {
-	Level2 field1 = 1;
-	message Level2 {
-		Level3 field2 = 2;
-		message Level3 {
-			Level4 field3 = 3;
-			message Level4 {
-				string field4 = 4;
-			}
-		}
-	}
-}
\ No newline at end of file
diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/routeDone.proto b/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/routeDone.proto
deleted file mode 100644
index 5fe75d274f2..00000000000
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/test/routeDone.proto
+++ /dev/null
@@ -1,10 +0,0 @@
-syntax = "proto3";
-package carkot;
-
-option java_package = "proto.car";
-option java_outer_classname = "RouteDone";
-
-message RouteDoneResponse {
-    int32 code = 1;
-    string errorMsg = 2;
-}