Testaments
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Testaments is a collective term, largely used within Christianity, to describe both the Old Testament and the New Testament, of The Bible. The Church of Jesus Christ of Latter-day Saints ("LDS Church"; see also Mormon) uses this term to include the Book of Mormon as another volume of scripture which specifically testifies of Jesus Christ's divinity.
Judaism uses only the term Hebrew Bible (for part of the "Old Testament" alone) because it does not accept the "New Testament" as scripture.
Islam only relies on the Qur'an, summed-up to be the Final Testament, including the important burden of the original Old Testament and New Testament.