jquery.fp-tests.js

// FP-stylish stuff already existing on jQuery
test("jQuery.filter", function() {
   same($(testArray).filter(function(){ return this % 20 == 0;}).get(), Array(20,40), "items matching for predicate are returned");
});

test("jQuery.map", function() {
   same($(testArray).map(function(){ return this+1; }).get(), Array(11,21,31,41), "items are mapped with function");
});

module("fp");

var testArray = Array(10,20,30,40);
var testAssociativeArray = {
    foo: 1,
    bar: 2,
};

test("jQuery.fp.head", function() {
    equals($(testArray).head(), 10, "Head returns first item of array");
});

test("jQuery.fp.tail", function() {
    var tail = $(testArray).tail();
    equals(tail.length, 3, "tail contains all but first item of given array");
    same($(tail).get(), Array(20,30,40), "Tail returns all but first items of given array");
});

test("jQuery.fp.getOrElse", function() {
    equals($(testAssociativeArray["foo"]).getOrElse(123), 1, "get retuns value from associative array");
    equals($(testAssociativeArray["zoo"]).getOrElse(123), 123, "when value is not found on associative array default value is returned");    	
});

test("jQuery.fp.foldLeft", function() {
    equals($(testArray).foldLeft(0, function(val1, val2){ return val1 + val2; }), 100, "array can be folded left");
    equals($(testArray).foldLeft(0, function(val1, val2){ return val1 + ", " + val2; }), "0, 10, 20, 30, 40", "foldLeft is done in proper order");
});

test("jQuery.fp.foldRight", function() {
    equals($(testArray).foldRight(0, function(val1, val2){ return val1 + val2; }), 100, "array can be folded right");
    equals($(testArray).foldRight(0, function(val1, val2){ return val1 + ", " + val2; }) , "0, 40, 30, 20, 10", "foldRight is done in proper order");
});

test("jQuery.fp.reverse", function() {
    same($(testArray).reverse().get(), Array(40,30,20,10), "array can be reversed");
});

test("jQuery.fp.exists", function() {
   equals($(testArray).exists(function() { return this % 50 == 0;}), false, "when no matching element false is returned");
   equals($(testArray).exists(function() { return this % 10 == 0;}), true, "when matching element is found true is returned");
});

test("jQuery.fp.forall", function() {
    equals($(testArray).forall(function() { return this > 0 }), true, "returns true if all items match predicate"); 
    equals($(testArray).forall(function() { return this != 30 }), false, "returns false if some item does not match to predicate");
});

test("jQuery.fp.take", function() {
    same($(testArray).take(2), Array(10,20), "first x items can be get from input");
});


test("jQuery.fp.drop", function() {
    same($(testArray).drop(2), Array(30,40), "drop first x items from input");
});

test("jQuery.fp.takeWhile", function() {
    same($(testArray).takeWhile(function() { return this < 25 }), Array(10,20), "Take items as long predicate matches");
});

test("jQuery.fp.dropWhile", function() {
    same($(testArray).dropWhile(function() { return this > 25 }), Array(30,40), "Drops items until predicate matches");
});

test("jQuery.fp.groupBy", function() {
    same($(testArray).groupBy(function() { return this % 20 }), {0: Array(20,40), 10: Array(10,30)}, "Groups items by given function");
});

test("jQuery.fp.partition", function() {
    same($(testArray).partition(function() { return this % 20 == 0 }), {true: Array(20,40), false: Array(10,30)}, "Partitions items by given function");
});