Why do we say that only repulsion is a sure test of charge ?

Because when we bring a charged body near an uncharged body an opposite charge is induced on the neutral body. And their will an attraction between them. But the given body is uncharged. 

Therefore, repulsion is a sure test of charge. 

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 because like charges repel each other 

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its not only repulsion theres attraction too

like charges repel each other

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