# Value assertions * **_AFT.assertEvalToTrue(value)** Assert that a given value evals to true. Lua coercion rules are applied so that values like 0,"",1.17 succeed in this assertion. If provided, extra_msg is a string which will be printed along with the failure message. * **_AFT.assertEvalToFalse(Value)** Assert that a given value eval to *false*. Lua coercion rules are applied so that *nil* and *false* succeed in this assertion. If provided, extra_msg is a string which will be printed along with the failure message. * **_AFT.assertIsTrue(value)** Assert that a given value compares to true. Lua coercion rules are applied so that values like 0, "", 1.17 all compare to true. * **_AFT.assertIsFalse(value)** Assert that a given value compares to false. Lua coercion rules are applied so that only nil and false all compare to false. * **_AFT.assertIsNil(value)** Assert that a given value is nil . * **_AFT.assertNotIsNil(value)** Assert that a given value is not *nil* . Lua coercion rules are applied so that values like ``0``, ``""``, ``false`` all validate the assertion. If provided, *extra_msg* is a string which will be printed along with the failure message. * **_AFT.assertIs(actual, expected)** Assert that two variables are identical. For string, numbers, boolean and for nil, this gives the same result as assertEquals() . For the other types, identity means that the two variables refer to the same object. Example : ```lua `s1='toto' s2='to'..'to' t1={1,2} t2={1,2} luaunit.assertIs(s1,s1) -- ok luaunit.assertIs(s1,s2) -- ok luaunit.assertIs(t1,t1) -- ok luaunit.assertIs(t1,t2) -- fail` ``` * **_AFT.assertNotIs(actual, expected)** Assert that two variables are not identical, in the sense that they do not refer to the same value. See assertIs() for more details.