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# Assert
Stability: 5 - Locked
This module is used for writing unit tests for your applications, you can
access it with `require('assert')`.
## assert.fail(actual, expected, message, operator)
Throws an exception that displays the values for `actual` and `expected` separated by the provided operator.
## assert(value, message), assert.ok(value, [message])
Tests if value is truthy, it is equivalent to `assert.equal(true, !!value, message);`
## assert.equal(actual, expected, [message])
Tests shallow, coercive equality with the equal comparison operator ( `==` ).
## assert.notEqual(actual, expected, [message])
Tests shallow, coercive non-equality with the not equal comparison operator ( `!=` ).
## assert.deepEqual(actual, expected, [message])
Tests for deep equality.
## assert.notDeepEqual(actual, expected, [message])
Tests for any deep inequality.
## assert.strictEqual(actual, expected, [message])
Tests strict equality, as determined by the strict equality operator ( `===` )
## assert.notStrictEqual(actual, expected, [message])
Tests strict non-equality, as determined by the strict not equal operator ( `!==` )
## assert.throws(block, [error], [message])
Expects `block` to throw an error. `error` can be constructor, regexp or
validation function.
Validate instanceof using constructor:
assert.throws(
function() {
throw new Error("Wrong value");
},
Error
);
Validate error message using RegExp:
assert.throws(
function() {
throw new Error("Wrong value");
},
/value/
);
Custom error validation:
assert.throws(
function() {
throw new Error("Wrong value");
},
function(err) {
if ( (err instanceof Error) && /value/.test(err) ) {
return true;
}
},
"unexpected error"
);
## assert.doesNotThrow(block, [message])
Expects `block` not to throw an error, see assert.throws for details.
## assert.ifError(value)
Tests if value is not a false value, throws if it is a true value. Useful when
testing the first argument, `error` in callbacks.