diff --git a/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testSecureHashFor.st b/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testSecureHashFor.st
index f6521ee3..5a6dfb9f 100644
--- a/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testSecureHashFor.st
+++ b/repository/Grease-Tests-Core.package/GRPlatformTest.class/instance/testSecureHashFor.st
@@ -1,9 +1,19 @@
 tests
 testSecureHashFor
-	"Make sure the platform class provides a #secureHashFor: method. The method is called by Seaside when hashing passwords. The Squeak implementation returns a SHA-1 hash but another equivalent hash method could also be used."
+	"Make sure the platform class provides a #secureHashFor: method. The method is called by Seaside when hashing passwords. 
+	The Pharo implementation returns a SHA-1 hash but another equivalent hash method could also be used."
 	
-	| a b |
+	| a b c d invalidUtf8 e f |
 	a := self platform secureHashFor: 'foobar'.
 	b := self platform secureHashFor: 'foobar'.
+	self assert: a equals: b.
+
+	c := self platform secureHashFor: #[102 111 111 98 97 114].
+	d := self platform secureHashFor: #[102 111 111 98 97 114].
+	self assert: c equals: d.
 	
-	self assert: (a = b)
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+	"The following ensures any byte array can be used (and not only the onces containing valid utf8)"
+	invalidUtf8 := #[160 161].
+	e := self platform secureHashFor: invalidUtf8.
+	f := self platform secureHashFor: invalidUtf8.
+	self assert: e equals: f
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