import * as TKUnit from "../tk-unit";
import { Label } from "@nativescript/core/ui/label";
// >> observable-array-require
import { ObservableArray, ChangedData, ChangeType } from "@nativescript/core/data/observable-array";
// << observable-array-require

export const test_ObservableArray_shouldCopySourceArrayItems = function () {
    // >> observable-array-create
    const sa = [1, 2, 3];
    const array = new ObservableArray(sa);
    // << observable-array-create

    TKUnit.assertEqual(array.length, 3, "ObservableArray length should be 3");
    TKUnit.assertEqual(sa.length, array.length, "ObservableArray should copy all source array items!");
};

export const test_ObservableArray_shouldCopyMultipleItemsAsSource = function () {
    // >> observable-array-arguments
    const array = new ObservableArray(1, 2, 3);
    // << observable-array-arguments

    TKUnit.assertEqual(array.length, 3, "ObservableArray length should be 3");
    TKUnit.assertEqual(array.getItem(1), 2, "ObservableArray should copy multiple items from source!");
};

export const test_ObservableArray_shouldCreateArrayFromSpecifiedLength = function () {
    // >> observable-array-length
    const array = new ObservableArray(100);
    // << observable-array-length

    TKUnit.assertEqual(array.length, 100, "ObservableArray should create array from specified length!");
};

export const test_ObservableArray_shouldBeAbleToSetLength = function () {
    // >> observable-array-newvalue
    const array = new ObservableArray(100);
    // >> (hide)
    TKUnit.assertEqual(array.length, 100, "ObservableArray should create array from specified length!");
    // << (hide)
    array.length = 50;
    // << observable-array-newvalue

    TKUnit.assertEqual(array.length, 50, "ObservableArray should respect new length!");
};

export const test_ObservableArray_getItemShouldReturnCorrectItem = function () {
    // >> observable-array-getitem
    const array = new ObservableArray([1, 2, 3]);
    const firstItem = array.getItem(0);
    const secondItem = array.getItem(1);
    const thirdItem = array.getItem(2);
    // << observable-array-getitem

    TKUnit.assert(firstItem === 1 && secondItem === 2 && thirdItem === 3, "ObservableArray getItem() should return correct item!");
};

export const test_ObservableArray_setItemShouldSetCorrectItem = function () {
    // >> observable-array-setitem
    const array = new ObservableArray([1, 2, 3]);
    array.setItem(1, 5);
    // << observable-array-setitem
    TKUnit.assert(array.getItem(1) === 5, "ObservableArray setItem() should set correct item!");
};

export const test_ObservableArray_setItemShouldRaiseCorrectEvent = function () {
    // >> observable-array-eventdata
    let index: number;
    let action: string;
    let addedCount: number;
    let removed: Array<number>;

    const array = new ObservableArray([1, 2, 3]);
    array.on("change", (args) => {
        index = args.index; // Index of the changed item.
        action = args.action; // Action. In this case Update.
        addedCount = args.addedCount; // Number of added items. In this case 1.
        removed = args.removed; // Array of removed items. In this case with single item (2).
    });
    array.setItem(1, 5);
    // << observable-array-eventdata
    TKUnit.assertEqual(index, 1);
    TKUnit.assertEqual(action, ChangeType.Update);
    TKUnit.assertEqual(addedCount, 1);
    TKUnit.assertEqual(removed[0], 2);
};

export const test_ObservableArray_concatShouldReturnNewArrayWithNewItemsAtTheEnd = function () {
    // >> observable-array-combine
    const array = new ObservableArray([1, 2, 3]);
    const result = array.concat([4, 5, 6]);
    // << observable-array-combine
    TKUnit.assert(result.length === 6 && result[4] === 5, "ObservableArray concat() should add items at the end!");
};

export const test_ObservableArray_joinShouldReturnStringWithAllItemsSeparatedWithComma = function () {
    // >> observable-array-join
    const array = new ObservableArray([1, 2, 3]);
    const result = array.join();
    // << observable-array-join
    TKUnit.assert(result === "1,2,3", "ObservableArray join() should return string with all items separated with comma!");
};

export const test_ObservableArray_joinShouldReturnStringWithAllItemsSeparatedWithDot = function () {
    // >> observable-array-join-separator
    const array = new ObservableArray([1, 2, 3]);
    const result = array.join(".");
    // << observable-array-join-separator
    TKUnit.assert(result === "1.2.3", "ObservableArray join() should return string with all items separated with dot!");
};

export const test_ObservableArray_popShouldRemoveTheLastElement = function () {
    // >> observable-array-join-pop
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.pop();
    // << observable-array-join-pop
    TKUnit.assert(result === 3 && array.length === 2, "ObservableArray pop() should remove last element!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_popShouldRemoveTheLastElementAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-join-change
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const index = array.length - 1;
    // << (hide)

    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "delete".
        // args.index is equal to the array length - 1.
        // args.removed.length is 1.
        // args.addedCount is 0.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.pop();
    // << observable-array-join-change

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Delete &&
        result.removed.length === 1 && result.index === index && result.addedCount === 0, "ObservableArray pop() should raise 'change' event with correct args!");
};

export const test_ObservableArray_pushShouldAppendNewElement = function () {
    // >> observable-array-push
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.push(4);
    // << observable-array-push
    TKUnit.assert(result === 4 && array.getItem(3) === 4, "ObservableArray push() should append new element!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_pushShouldAppendNewElementAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-change-push
    const array = new ObservableArray([1, 2, 3]);
    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "add".
        // args.index is equal to the array length.
        // args.removed.length is 0.
        // args.addedCount is 1.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.push(4);
    // << observable-array-change-push

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Add &&
        result.removed.length === 0 && result.index === 3 && result.addedCount === 1, "ObservableArray push() should raise 'change' event with correct args!");
};

export const test_ObservableArray_pushShouldAppendNewElements = function () {
    // >> observable-array-push-multiple
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.push(4, 5, 6);
    // << observable-array-push-multiple
    TKUnit.assert(result === 6 && array.getItem(5) === 6, "ObservableArray push() should append new elements!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_pushShouldAppendNewElementsAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-push-multiple-info
    const array = new ObservableArray([1, 2, 3]);
    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "add".
        // args.index is equal to the array length.
        // args.removed.length is 0.
        // args.addedCount is equal to the number of added items.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.push(4, 5, 6);
    // << observable-array-push-multiple-info

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Add &&
        result.removed.length === 0 && result.index === 3 && result.addedCount === 3, "ObservableArray push() should raise 'change' event with correct args!");
};

export const test_ObservableArray_pushShouldAppendNewElementsFromSourceArray = function () {
    // >> observable-array-push-source
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.push([4, 5, 6]);
    // << observable-array-push-source
    TKUnit.assert(result === 6 && array.getItem(5) === 6, "ObservableArray push() should append new elements from source array!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_pushShouldAppendNewElementsFromSourceArrayAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-push-source-info
    const array = new ObservableArray([1, 2, 3]);
    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "add".
        // args.index is equal to the array length.
        // args.removed.length is 0.
        // args.addedCount is equal to the number of added items.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.push([4, 5, 6]);
    // << observable-array-push-source-info

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Add &&
        result.removed.length === 0 && result.index === 3 && result.addedCount === 3, "ObservableArray push() should raise 'change' event with correct args!");
};

export const test_ObservableArray_reverseShouldReturnNewReversedArray = function () {
    // >> observable-array-reverse
    const array = new ObservableArray([1, 2, 3]);
    const result = array.reverse();
    // << observable-array-reverse
    TKUnit.assert(result.length === 3 && result[0] === 3, "ObservableArray reverse() should return new reversed array!");
};

export const test_ObservableArray_shiftShouldRemoveTheFirstElement = function () {
    // >> observable-array-shift
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.shift();
    // << observable-array-shift
    TKUnit.assert(result === 1 && array.length === 2, "ObservableArray shift() should remove first element!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_shiftShouldRemoveTheFirstElementAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-shift-change
    const array = new ObservableArray([1, 2, 3]);

    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "delete".
        // args.index is 0.
        // args.removed.length is 1.
        // args.addedCount is 0.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.shift();
    // << observable-array-shift-change

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Delete &&
        result.removed.length === 1 && result.index === 0 && result.addedCount === 0, "ObservableArray shift() should raise 'change' event with correct args!");
};

export const test_ObservableArray_sliceShouldReturnSectionAsNewArray = function () {
    // >> observable-array-slice
    const array = new ObservableArray([1, 2, 3]);
    const result = array.slice();
    // << observable-array-slice
    TKUnit.assert(result[2] === 3 && result.length === 3, "ObservableArray slice() should return section!");
};

export const test_ObservableArray_sliceWithParamsShouldReturnSectionAsNewArray = function () {
    // >> observable-array-slice-args
    const array = new ObservableArray([1, 2, 3, 4, 5]);
    const result = array.slice(2, 4);
    // << observable-array-slice-args
    TKUnit.assert(result[1] === 4 && result.length === 2, "ObservableArray slice() should return section according to specified arguments!");
};

export const test_ObservableArray_sortShouldReturnNewSortedArray = function () {
    // >> observable-array-sort
    const array = new ObservableArray([3, 2, 1]);
    const result = array.sort();
    // << observable-array-sort
    TKUnit.assert(result[0] === 1 && result.length === 3, "ObservableArray sort() should return new sorted array!");
};

export const test_ObservableArray_sortShouldReturnNewSortedArrayAccordingSpecifiedOrder = function () {
    // >> observable-array-sort-comparer
    const array = new ObservableArray([10, 100, 1]);
    const result = array.sort((a: number, b: number) => a - b);
    // << observable-array-sort-comparer
    TKUnit.assert(result[2] === 100 && result.length === 3, "ObservableArray sort() should return new sorted array according to specified order!");
};

export const test_ObservableArray_spliceShouldRemoveSpecifiedNumberOfElementsStartingFromSpecifiedIndex = function () {
    // >> observable-array-splice
    const array = new ObservableArray(["one", "two", "three"]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.splice(1, 2);
    // << observable-array-splice
    TKUnit.assert(result.length === 2 && result[0] === "two" && array.length === 1 && array.getItem(0) === "one",
        "ObservableArray splice() should remove specified number of elements starting from specified index!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_spliceShouldRemoveSpecifiedNumberOfElementsStartingFromSpecifiedIndexAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-splice-change
    const array = new ObservableArray([1, 2, 3]);

    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "splice".
        // args.index is the start index.
        // args.removed.length is equal to the number of deleted items.
        // args.addedCount is 0.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.splice(1, 2);
    // << observable-array-splice-change

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Splice &&
        result.removed.length === 2 && result.index === 1 && result.addedCount === 0, "ObservableArray splice() should raise 'change' event with correct args!");
};

export const test_ObservableArray_spliceShouldInsertNewItemsInPlaceOfRemovedItemsStartingFromSpecifiedIndex = function () {
    // >> observable-array-splice-args
    const array = new ObservableArray(["one", "two", "three"]);
    const result = array.splice(1, 2, "six", "seven");
    // << observable-array-splice-args
    TKUnit.assert(result.length === 2 && result[0] === "two" && array.length === 3 && array.getItem(2) === "seven",
        "ObservableArray splice() should insert new items in place of removed!");
};

export const test_ObservableArray_spliceShouldRemoveAndInertSpecifiedNumberOfElementsStartingFromSpecifiedIndexAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-splice-args-change
    const array = new ObservableArray(["one", "two", "three"]);

    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        // Argument (args) is ChangedData<T>.
        // args.eventName is "change".
        // args.action is "splice".
        // args.index is the start index.
        // args.removed.length is equal to the number of deleted items.
        // args.addedCount is equal to the amount of added and replaced items.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.splice(1, 2, "six", "seven", "eight");
    // << observable-array-splice-args-change

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Splice &&
        result.removed.length === 2 && result.index === 1 && result.addedCount === 3, "ObservableArray splice() should raise 'change' event with correct args!");
};

export const test_ObservableArray_unshiftShouldInsertNewElementsFromTheStart = function () {
    // >> observable-array-unshift
    const array = new ObservableArray([1, 2, 3]);
    // >> (hide)
    const viewBase = new Label();
    viewBase.set("testProperty", 0);
    viewBase.bind({ sourceProperty: "length", targetProperty: "testProperty" }, array);
    // << (hide)
    const result = array.unshift(4, 5);
    // << observable-array-unshift

    TKUnit.assert(array.getItem(0) === 4 && result === 5 && array.length === 5, "ObservableArray unshift() should insert new elements from the start!");
    TKUnit.assert(viewBase.get("testProperty") === array.length, "Expected: " + array.length + ", Actual: " + viewBase.get("testProperty"));
};

export const test_ObservableArray_unshiftShouldInsertNewElementsFromTheStartAndRaiseChangeEventWithCorrectArgs = function () {
    let result: ChangedData<number>;

    // >> observable-array-unshift-change
    const array = new ObservableArray([1, 2, 3]);
    array.on(ObservableArray.changeEvent, (args: ChangedData<number>) => {
        //// Argument (args) is ChangedData<T>.
        //// args.eventName is "change".
        //// args.action is "add".
        //// args.index is 0.
        //// args.removed.length is 0.
        //// args.addedCount is equal to the number of inserted items.

        // >> (hide)
        result = args;
        // << (hide)
    });

    array.unshift(4, 5);
    // << observable-array-unshift-change

    TKUnit.assert(result.eventName === ObservableArray.changeEvent && result.action === ChangeType.Add &&
        result.removed.length === 0 && result.index === 0 && result.addedCount === 2, "ObservableArray unshift() should raise 'change' event with correct args!");
};

export const test_ObservableArray_indexOfShouldReturnCorrectIndex = function () {
    // >> observable-array-indexof
    const array = new ObservableArray(["one", "two", "three"]);
    const result = array.indexOf("two");
    // << observable-array-indexof
    TKUnit.assert(result === 1, "ObservableArray indexOf() should return correct index!");
};

export const test_ObservableArray_indexOfShouldReturnCorrectIndexStartingFrom = function () {
    // >> observable-array-indexof-args
    const array = new ObservableArray(["one", "two", "three"]);
    const result = array.indexOf("two", 2);
    // << observable-array-indexof-args
    TKUnit.assert(result === -1, "ObservableArray indexOf() should return correct index!");
};

export const test_ObservableArray_lastIndexOfShouldReturnCorrectIndex = function () {
    const array = new ObservableArray(["one", "two", "two", "three"]);
    // >> observable-array-lastindexof
    const result = array.lastIndexOf("two");
    // << observable-array-lastindexof
    TKUnit.assert(result === 2, "ObservableArray lastIndexOf() should return correct index!");
};

export const test_ObservableArray_lastIndexOfShouldReturnCorrectIndexStartingFrom = function () {
    // >> observable-array-lastindexof-args
    const array = new ObservableArray(["one", "two", "two", "one", "three"]);
    const result = array.lastIndexOf("two", 1);
    // << observable-array-lastindexof-args
    TKUnit.assert(result === 1, "ObservableArray lastIndexOf() should return correct index!");
};

export const test_ObservableArray_settingLengthToZeroPerformsSplice = function () {
    const array = new ObservableArray([1, 2, 3]);

    let changeRaised = false;
    array.on("change", (args: ChangedData<number>) => {
        changeRaised = true;
        TKUnit.assertEqual(args.object, array);
        TKUnit.assertEqual(args.eventName, "change");
        TKUnit.assertEqual(args.action, ChangeType.Splice);
        TKUnit.assertEqual(args.index, 0);
        TKUnit.assertEqual(args.addedCount, 0);
        TKUnit.arrayAssert(args.removed, [1, 2, 3]);
    });

    array.length = 0;

    TKUnit.assertEqual(array.length, 0);
    TKUnit.assertTrue(changeRaised);
};

export const test_ObservableArray_settingLengthToSomethingPerformsSplice = function () {
    const array = new ObservableArray([1, 2, 3]);
    let changeRaised = false;

    array.on("change", (args: ChangedData<number>) => {
        changeRaised = true;
        TKUnit.assertEqual(args.object, array);
        TKUnit.assertEqual(args.eventName, "change");
        TKUnit.assertEqual(args.action, ChangeType.Splice);
        TKUnit.assertEqual(args.index, 1);
        TKUnit.assertEqual(args.addedCount, 0);
        TKUnit.arrayAssert(args.removed, [2, 3]);
    });

    array.length = 1;

    TKUnit.assertEqual(array.length, 1);
    TKUnit.assertTrue(changeRaised);
};

const array = new ObservableArray();

// We do not have indexer!
export const test_getItem_isDefined = function () {
    TKUnit.assert(typeof (array.getItem) === "function", "Method 'getItem()' should be defined!");
};

export const test_setItem_isDefined = function () {
    TKUnit.assert(typeof (array.setItem) === "function", "Method 'setItem()' should be defined!");
};

// Standard array properties and methods
export const test_length_isDefined = function () {
    TKUnit.assert(typeof (array.length) === "number", "Property 'length' should be defined!");
};

export const test_toString_isDefined = function () {
    TKUnit.assert(typeof (array.toString) === "function", "Method 'toString()' should be defined!");
};

export const test_toLocaleString_isDefined = function () {
    TKUnit.assert(typeof (array.toLocaleString) === "function", "Method 'toString()' should be defined!");
};

export const test_concat_isDefined = function () {
    TKUnit.assert(typeof (array.concat) === "function", "Method 'concat()' should be defined!");
};

export const test_join_isDefined = function () {
    TKUnit.assert(typeof (array.join) === "function", "Method 'join()' should be defined!");
};

export const test_pop_isDefined = function () {
    TKUnit.assert(typeof (array.pop) === "function", "Method 'pop()' should be defined!");
};

export const test_push_isDefined = function () {
    TKUnit.assert(typeof (array.push) === "function", "Method 'push()' should be defined!");
};

export const test_reverse_isDefined = function () {
    TKUnit.assert(typeof (array.reverse) === "function", "Method 'reverse()' should be defined!");
};

export const test_shift_isDefined = function () {
    TKUnit.assert(typeof (array.shift) === "function", "Method 'shift()' should be defined!");
};

export const test_slice_isDefined = function () {
    TKUnit.assert(typeof (array.slice) === "function", "Method 'slice()' should be defined!");
};

export const test_sort_isDefined = function () {
    TKUnit.assert(typeof (array.sort) === "function", "Method 'sort()' should be defined!");
};

export const test_splice_isDefined = function () {
    TKUnit.assert(typeof (array.splice) === "function", "Method 'splice()' should be defined!");
};

export const test_unshift_isDefined = function () {
    TKUnit.assert(typeof (array.unshift) === "function", "Method 'unshift()' should be defined!");
};

export const test_indexOf_isDefined = function () {
    TKUnit.assert(typeof (array.indexOf) === "function", "Method 'indexOf()' should be defined!");
};

export const test_lastIndexOf_isDefined = function () {
    TKUnit.assert(typeof (array.lastIndexOf) === "function", "Method 'lastIndexOf()' should be defined!");
};

export const test_every_isDefined = function () {
    TKUnit.assert(typeof (array.every) === "function", "Method 'every()' should be defined!");
};

export const test_some_isDefined = function () {
    TKUnit.assert(typeof (array.some) === "function", "Method 'some()' should be defined!");
};

export const test_forEach_isDefined = function () {
    TKUnit.assert(typeof (array.forEach) === "function", "Method 'forEach()' should be defined!");
};

export const test_map_isDefined = function () {
    TKUnit.assert(typeof (array.map) === "function", "Method 'map()' should be defined!");
};

export const test_filter_isDefined = function () {
    TKUnit.assert(typeof (array.filter) === "function", "Method 'filter()' should be defined!");
};

export const test_reduce_isDefined = function () {
    TKUnit.assert(typeof (array.reduce) === "function", "Method 'reduce()' should be defined!");
};

export const test_reduce_without_initial_value = function () {
    const sa = [1, 2, 3];
    let array: ObservableArray<number> = new ObservableArray(sa);
    const result = array.reduce((a, b) => a + b);
    TKUnit.assertEqual(result, 6, "ObservableArray reduce function broken when initialValue is missing");
};

export const test_reduce_with_initial_value = function () {
    const sa = [1, 2, 3];
    let array: ObservableArray<number> = new ObservableArray(sa);
    const result = array.reduce((a, b) => a + b, 5);
    TKUnit.assertEqual(result, 11, "ObservableArray reduce function broken when Initial Value is passed.");
};

export const test_reduce_with_zero_as_initial_value = function () {
    const sa = [{ prop: 1 }, { prop: 2 }, { prop: 3 }];
    let array: ObservableArray<any> = new ObservableArray(sa);
    const result = array.reduce((a, b) => a + b.prop, 0);
    TKUnit.assertEqual(result, 6, "ObservableArray reduce function broken when Initial Value is zero.");
};

export const test_reduceRight_isDefined = function () {
    TKUnit.assert(typeof (array.reduceRight) === "function", "Method 'reduceRight()' should be defined!");
};

export const test_reduceRight_without_initial_value = function () {
    const sa = [1, 2, 3];
    let array: ObservableArray<number> = new ObservableArray(sa);
    const result = array.reduceRight((a, b) => a + b);
    TKUnit.assertEqual(result, 6, "ObservableArray reduceRight function broken when initialValue is missing");
};

export const test_reduceRight_with_initial_value = function () {
    const sa = [1, 2, 3];
    let array: ObservableArray<number> = new ObservableArray(sa);
    const result = array.reduceRight((a, b) => a + b, 5);
    TKUnit.assertEqual(result, 11, "ObservableArray reduceRight function broken when Initial Value is passed.");
};

export const test_reduceRight_with_zero_as_initial_value = function () {
    const sa = [{ prop: 1 }, { prop: 2 }, { prop: 3 }];
    let array: ObservableArray<any> = new ObservableArray(sa);
    const result = array.reduceRight((a, b) => a + b.prop, 0);
    TKUnit.assertEqual(result, 6, "ObservableArray reduceRight function broken when Initial Value is zero.");
};