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# 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.
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