TestFailure: Assertion failed in first practice from Squeak by Example

Hell Squeakers,

 

At home I went through the first half of the Squeak by Example book. The guided practice went without a hitch however, when I worked through the first practice of writing a simple String method at work, on a different image, I ran into this problem. Why am I receiving an 'Assertion failed' message?

 

testShout
 self assert: ('oh no' shout = 'OH NO!')

 

shout 
 ^ self asUppercase , '!'
   

TestFailure: Assertion failed

 

Regards,

 

Eric Eisaman

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