1.is there a bulb which is plugged in properly and filament is not broken.
2.checking whether the user using the 1st switch or the 2nd.
3.if he puts the 1st switch on will the electric bulb glow.
4.if he press it to off will the bulb turns off.
5.if he uses the 2nd switch on will the bulb gets on.
6.if he turn off will it work properly.
7.if he puts 1st switch on and other off will the bulb tends to work or not.
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in start of this test case, both bulbs were off.. when user switched on the first switch den bulb glew but second one was off, so this will work
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