Assert

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 ( ).

Tests shallow, coercive non-equality with the not equal comparison operator ( != ).

assert.deepEqual(actual, expected[, message])

assert.notDeepEqual(actual, expected[, message])

Tests for any deep inequality.

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 to throw an error. error can be constructor, RegExp or
validation function.

Validate error message using RegExp:

Custom error validation:

Expects block not to throw an error, see 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.