diff --git a/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testNewTemporaryFile.st b/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testNewTemporaryFile.st
index f02a8289..a4c49df3 100644
--- a/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testNewTemporaryFile.st
+++ b/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testNewTemporaryFile.st
@@ -1,13 +1,20 @@
 tests-files
 testNewTemporaryFile
 
-	| temporaryFile |
+	| temporaryFile1 temporaryFile2 |
 	[
-		temporaryFile := GRPlatform current newTemporaryFile.
+		temporaryFile1 := GRPlatform current newTemporaryFile.
+		temporaryFile2 := GRPlatform current newTemporaryFile.
 		GRPlatform current
-			writeFileStreamOn: temporaryFile
+			writeFileStreamOn: temporaryFile1
 			do: [ :str | str nextPutAll: 'test temporary' ]
 			binary: false.
-		self assert: (GRPlatform current fileExists: temporaryFile)
-	] ensure: [ GRPlatform current deleteFile: temporaryFile ].
-	self deny: (GRPlatform current fileExists: temporaryFile)
\ No newline at end of file
+		GRPlatform current
+			writeFileStreamOn: temporaryFile2
+			do: [ :str | str nextPutAll: #[116 101 115 116 32 116 101 109 112 111 114 97 114 121] ]
+			binary: true.
+		self assert: (GRPlatform current fileExists: temporaryFile1).
+		self deny: (GRPlatform current localNameOf: temporaryFile1) equals: (GRPlatform current localNameOf: temporaryFile2)
+	] ensure: [ GRPlatform current deleteFile: temporaryFile1. GRPlatform current deleteFile: temporaryFile2  ].
+	self deny: (GRPlatform current fileExists: temporaryFile1).
+	self deny: (GRPlatform current fileExists: temporaryFile2)
\ No newline at end of file
diff --git a/repository/Grease-Tests-Core.package/monticello.meta/categories.st b/repository/Grease-Tests-Core.package/monticello.meta/categories.st
index ee8a55f5..7e8202de 100644
--- a/repository/Grease-Tests-Core.package/monticello.meta/categories.st
+++ b/repository/Grease-Tests-Core.package/monticello.meta/categories.st
@@ -1 +1 @@
-SystemOrganization addCategory: #'Grease-Tests-Core'!
+self packageOrganizer ensurePackage: #'Grease-Tests-Core' withTags: #()!