node-vitals
Version:
Do more with less. A simple, high-performing, functional JavaScript library.
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JavaScript
/**
* -----------------------------------------------------------------------------
* VITALS UNIT TESTS: vitals.roll
* -----------------------------------------------------------------------------
* @section base
* @see [vitals.roll docs](https://github.com/imaginate/vitals/wiki/vitals.roll)
* @see [test api](https://github.com/imaginate/vitals/blob/master/test/setup/interface.js)
* @see [test helpers](https://github.com/imaginate/vitals/blob/master/test/setup/helpers.js)
*
* @author Adam Smith <adam@imaginate.life> (https://github.com/imaginate)
* @copyright 2017 Adam A Smith <adam@imaginate.life> (https://github.com/imaginate)
*
* Annotations:
* @see [JSDoc3](http://usejsdoc.org)
* @see [Closure Compiler JSDoc Syntax](https://developers.google.com/closure/compiler/docs/js-for-compiler)
*/
method('roll', function() {
should('reduce the source object to a result', function() {
test('<object>', '<iteratee>', function() {
var obj = { a: 1, b: 2, c: 3 };
var result = vitals.roll(obj, function(prevVal, currVal) {
return prevVal + currVal;
});
assert( result === 6 );
});
test(1, '<object>', '<iteratee>', function() {
var obj = { a: 1, b: 2, c: 3 };
var result = vitals.roll(1, obj, function(prevVal, currVal) {
return prevVal + currVal;
});
assert( result === 7 );
});
});
should('reduce the source array to a result', function() {
test('<array>', '<iteratee>', function() {
var arr = [ 1, 2, 3 ];
var result = vitals.roll(arr, function(prevVal, currVal) {
return prevVal + currVal;
});
assert( result === 6 );
});
test(1, '<array>', '<iteratee>', function() {
var arr = [ 1, 2, 3 ];
var result = vitals.roll(1, arr, function(prevVal, currVal) {
return prevVal + currVal;
});
assert( result === 7 );
});
});
should('return the valid result after x cycles', function() {
test(0, 8, '<iteratee>', function() {
var result = vitals.roll(0, 8, function(prevVal) {
return prevVal + 5;
});
assert( result === 40 );
});
});
should('iterate over all key => value pairs', function() {
test(0, '<object>', '<iteratee>', function() {
var obj = { a: 1, b: 2, c: 3 };
var vals = [];
var keys = [];
vitals.roll(0, obj, function(prev, val, key) {
vals.push(val);
keys.push(key);
return 0;
});
assert( hasVal(vals, 1) );
assert( hasVal(vals, 2) );
assert( hasVal(vals, 3) );
assert( vals.length === 3 );
assert( hasVal(keys, 'a') );
assert( hasVal(keys, 'b') );
assert( hasVal(keys, 'c') );
assert( keys.length === 3 );
});
});
should('iterate over all index => value pairs', function() {
test('<array>', '<iteratee>', function() {
var arr = [ 1, 2, 3 ];
var vals = [];
var keys = [];
vitals.roll(arr, function(prev, val, i) {
vals.push(val);
keys.push(i);
return 0;
});
assert( vals[0] === 2 );
assert( vals[1] === 3 );
assert( vals.length === 2 );
assert( keys[0] === 1 );
assert( keys[1] === 2 );
assert( keys.length === 2 );
});
test(0, '<array>', '<iteratee>', function() {
var arr = [ 1, 2, 3 ];
var vals = [];
var keys = [];
vitals.roll(0, arr, function(prev, val, i) {
vals.push(val);
keys.push(i);
return 0;
});
assert( vals[0] === 1 );
assert( vals[1] === 2 );
assert( vals[2] === 3 );
assert( vals.length === 3 );
assert( keys[0] === 0 );
assert( keys[1] === 1 );
assert( keys[2] === 2 );
assert( keys.length === 3 );
});
});
should('call the iteratee x times', function() {
test(0, 3, '<iteratee>', function() {
var keys = [];
vitals.roll(0, 3, function(prev, i) {
keys.push(i);
return 0;
});
assert( keys[0] === 0 );
assert( keys[1] === 1 );
assert( keys[2] === 2 );
assert( keys.length === 3 );
});
});
should('correctly clone the source', function() {
test('<object>', '<iteratee>', function() {
var obj = { a: 1, b: 2, c: 3 };
vitals.roll(obj, function(prevVal, currVal, key, src) {
assert( obj !== src );
return 0;
});
});
test('<array>', '<iteratee>', function() {
var arr = [ 1, 2, 3 ];
vitals.roll(arr, function(prevVal, currVal, i, src) {
assert( arr !== src );
return 0;
});
});
});
should('bind the iteratee correctly', function() {
test(0, '<object>', '<iteratee>', '<this>', function() {
var obj = { a: 1, b: 2, c: 3 };
var self = {};
vitals.roll(0, obj, function(prevVal, currVal, key) {
this[key] = currVal;
return 0;
}, self);
assert( self !== obj );
assert( self.a === 1 );
assert( self.b === 2 );
assert( self.c === 3 );
});
test(0, '<array>', '<iteratee>', '<this>', function() {
var arr = [ 1, 2, 3 ];
var self = [];
vitals.roll(0, arr, function(prevVal, currVal, i) {
this[i] = currVal;
return 0;
}, self);
assert( self !== arr );
assert( self[0] === 1 );
assert( self[1] === 2 );
assert( self[2] === 3 );
assert( self.length === 3 );
});
test(0, 3, '<iteratee>', '<this>', function() {
var cycle = 0;
var self = [];
vitals.roll(0, 3, function(prevVal, i) {
this[i] = ++cycle;
return 0;
}, self);
assert( self[0] === 1 );
assert( self[1] === 2 );
assert( self[2] === 3 );
assert( self.length === 3 );
});
});
should('throw an error', function() {
test(function() {
assert.throws(function() {
vitals.roll();
}, validErr);
});
test({}, function() {
assert.throws(function() {
vitals.roll({});
}, validErr);
});
test(null, '<iteratee>', function() {
assert.throws(function() {
vitals.roll(null, function(){});
}, validTypeErr);
});
test({}, '<iteratee>', 'fail', function() {
assert.throws(function() {
vitals.roll({}, function(){}, 'fail');
}, validTypeErr);
});
});
});