Hi: While stepping through bytecodes, I noticed a slightly annoying inefficiency in the SUnit implementation. The description string in #assert:equals: is always computed, even if it is not necessary. While that might not be a performance problem, I find it rather distracting when I have to debug on the bytecode/VM level. Since there seem to be only 127 senders or so in the image, you will probably not notice a big performance gain. The change to compute the string only when necessary is below. Best regards Stefan PS: This is a resend, because the original mail seemed to have been lost, while the mailing list was down. !TestCase methodsFor: 'asserting' stamp: 'StefanMarr 3/13/2012 23:41'! assert: aBooleanOrBlock description: aStringOrBlock aBooleanOrBlock value ifFalse: [ | aString | aString := aStringOrBlock value. self logFailure: aString. TestResult failure signal: aString] ! ! !TestCase methodsFor: 'asserting' stamp: 'StefanMarr 3/13/2012 23:40'! assert: aBooleanOrBlock description: aStringOrBlock resumable: resumableBoolean | exception | aBooleanOrBlock value ifFalse: [|aString| aString := aStringOrBlock value. self logFailure: aString. exception := resumableBoolean ifTrue: [TestResult resumableFailure] ifFalse: [TestResult failure]. exception signal: aString] ! ! !TestCase methodsFor: 'asserting' stamp: 'StefanMarr 3/13/2012 23:40'! assert: expected equals: actual ^ self assert: (expected = actual) description: [self comparingStringBetween: actual and: expected] ! ! -- Stefan Marr Software Languages Lab Vrije Universiteit Brussel Pleinlaan 2 / B-1050 Brussels / Belgium http://soft.vub.ac.be/~smarr Phone: +32 2 629 2974 Fax: +32 2 629 3525