jasmine unit testing - testing for an undefined property of an object

javascript unit-testing bdd undefined jasmine
wmitchell picture wmitchell · Jan 10, 2011 · Viewed 36.7k times · Source

I have the following statement

expect(A.["BAR"].name).toEqual("foo");

which due to the fact my object A has the top level property "BAR" and bar has the value "foo" passes.

I'd like to test my structure to confirm a property "NONEXISTINGPROP" has not be defined. e.g.

expect(A.["NONEXISTINGPROP"].name).not.toBeDefined();

However I seem to get 

  "TypeError: A.[NONEXISTINGPROP] is undefined"

in the jasmine test runner this is exactly what I want to confirm. Any idea why Jasmine is crying. I was hoping for it to pass this.

Thanks SO

Answer

wmitchell picture wmitchell · Jan 11, 2011

The answer seems to be ... 

expect(A.NONEXISTINGPROP).not.toBeDefined();

ie remove the name bit

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