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//
// NNArrayDiffCalculatorSpec.m
// ArrayDiff
//
// Created by Nick Tymchenko on 05/03/15.
// Copyright (c) 2015 Nick Tymchenko. All rights reserved.
//
#import <XCTest/XCTest.h>
#import "NNTestItem.h"
SpecBegin(NNArrayDiffCalculator)
describe(@"diff calculation", ^{
__block NNArrayDiffCalculator *calculator;
__block NSArray *before;
__block NSArray *after;
__block NNMutableArrayDiff *expectedDiff;
beforeEach(^{
before = nil;
after = nil;
expectedDiff = [[NNMutableArrayDiff alloc] init];
});
afterEach(^{
NNArrayDiff *calculatedDiff = [calculator calculateDiffForObjectsBefore:before andAfter:after];
expect(calculatedDiff).to.equal(expectedDiff);
});
describe(@"for objects without id", ^{
beforeAll(^{
calculator = [[NNArrayDiffCalculator alloc] init];
});
it(@"should return empty diff for empty arrays", ^{
before = @[];
after = nil;
});
it(@"should return diff between empty and non-empty arrays", ^{
before = @[];
after = @[ @"0", @"1", @"2" ];
[expectedDiff.inserted addIndexesInRange:NSMakeRange(0, 3)];
});
it(@"should return diff between non-empty and empty arrays", ^{
before = @[ @"0", @"1", @"2" ];
after = @[];
[expectedDiff.deleted addIndexesInRange:NSMakeRange(0, 3)];
});
it(@"should handle multiple insertions", ^{
before = @[ @"0", @"1", @"2", @"3", @"4", @"5" ];
after = @[ @"foo", @"0", @"1", @"bar", @"2", @"3", @"4", @"5", @"baz" ];
[expectedDiff.inserted addIndex:0];
[expectedDiff.inserted addIndex:3];
[expectedDiff.inserted addIndex:8];
});
it(@"should handle multiple deletions", ^{
before = @[ @"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9" ];
after = @[ @"1", @"2", @"3", @"4", @"7", @"8" ];
[expectedDiff.deleted addIndex:0];
[expectedDiff.deleted addIndex:5];
[expectedDiff.deleted addIndex:6];
[expectedDiff.deleted addIndex:9];
});
it(@"should handle deletion and insertion at the same index", ^{
before = @[ @"0", @"1", @"2", @"3", @"4", @"5" ];
after = @[ @"0", @"1", @"2", @"3", @"foo", @"5" ];
[expectedDiff.deleted addIndex:4];
[expectedDiff.inserted addIndex:4];
});
it(@"should handle multiple deletions and insertions", ^{
before = @[ @"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"9" ];
after = @[ @"1", @"foo", @"2", @"3", @"bar", @"4", @"7", @"baz", @"8" ];
[expectedDiff.deleted addIndex:0];
[expectedDiff.deleted addIndex:5];
[expectedDiff.deleted addIndex:6];
[expectedDiff.deleted addIndex:9];
[expectedDiff.inserted addIndex:1];
[expectedDiff.inserted addIndex:4];
[expectedDiff.inserted addIndex:7];
});
it(@"should handle a moved object", ^{
before = @[ @"0", @"foo", @"1", @"2", @"3" ];
after = @[ @"0", @"1", @"2", @"foo", @"3" ];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:1 after:3 type:NNDiffChangeMove]];
});
it(@"should handle a moved object in an optimal way", ^{
before = @[ @"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8", @"foo" ];
after = @[ @"foo", @"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"8" ];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:9 after:0 type:NNDiffChangeMove]];
});
it(@"should handle multiple moves", ^{
before = @[ @"0", @"1", @"foo", @"bar", @"2", @"3", @"4", @"5", @"6", @"7", @"baz", @"8", @"9" ];
after = @[ @"0", @"baz", @"1", @"2", @"3", @"4", @"foo", @"bar", @"5", @"6", @"7", @"8", @"9" ];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:2 after:6 type:NNDiffChangeMove]];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:3 after:7 type:NNDiffChangeMove]];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:10 after:1 type:NNDiffChangeMove]];
});
it(@"should handle multiple moves and deletions", ^{
before = @[ @"0", @"1", @"foo", @"bar", @"2", @"3", @"4", @"5", @"baz", @"6", @"7", @"qux" ];
after = @[ @"foo", @"0", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"bar" ];
[expectedDiff.deleted addIndex:8];
[expectedDiff.deleted addIndex:11];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:2 after:0 type:NNDiffChangeMove]];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:3 after:9 type:NNDiffChangeMove]];
});
it(@"should handle multiple moves and insertions", ^{
before = @[ @"0", @"foo", @"1", @"2", @"3", @"4", @"5", @"6", @"7", @"bar" ];
after = @[ @"0", @"1", @"2", @"3", @"baz", @"foo", @"bar", @"qux", @"4", @"5", @"6", @"7" ];
[expectedDiff.inserted addIndex:4];
[expectedDiff.inserted addIndex:7];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:1 after:5 type:NNDiffChangeMove]];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:9 after:6 type:NNDiffChangeMove]];
});
it(@"should handle multiple moves, deletions and insertions", ^{
before = @[ @"0", @"foo", @"1", @"2", @"3", @"dead", @"4", @"5", @"bar", @"6", @"beef", @"7" ];
after = @[ @"0", @"1", @"2", @"3", @"baz", @"foo", @"bar", @"qux", @"4", @"5", @"6", @"7" ];
[expectedDiff.deleted addIndex:5];
[expectedDiff.deleted addIndex:10];
[expectedDiff.inserted addIndex:4];
[expectedDiff.inserted addIndex:7];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:1 after:5 type:NNDiffChangeMove]];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:8 after:6 type:NNDiffChangeMove]];
});
});
describe(@"for objects with id", ^{
NNTestItem * (^item)(NSInteger, NSString *) = ^(NSInteger itemId, NSString *name) {
return [NNTestItem itemWithId:itemId name:name];
};
beforeAll(^{
calculator = [[NNArrayDiffCalculator alloc] init];
calculator.objectIdBlock = ^(NNTestItem *item) {
return @(item.itemId);
};
calculator.objectUpdatedBlock = ^BOOL (NNTestItem *itemBefore, NNTestItem *itemAfter) {
expect(itemBefore.itemId).to.equal(itemAfter.itemId);
NSString *nameBefore = itemBefore.name ?: @"";
NSString *nameAfter = itemAfter.name ?: @"";
return [nameBefore compare:nameAfter options:NSCaseInsensitiveSearch] != NSOrderedSame;
};
});
it(@"should return an empty diff when objects are not updated", ^{
before = @[ item(42, @"foo") ];
after = @[ item(42, @"FOO") ];
});
it(@"should spot an updated object", ^{
before = @[ item(42, @"foo") ];
after = @[ item(42, @"bar") ];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:0 after:0 type:NNDiffChangeUpdate]];
});
it(@"should spot a moved & updated object", ^{
before = @[ item(42, @"foo"), item(0, @"0"), item(1, @"1") ];
after = @[ item(0, @"0"), item(1, @"1"), item(42, @"bar") ];
[expectedDiff.changed addObject:[[NNArrayDiffChange alloc] initWithBefore:0 after:2 type:NNDiffChangeUpdate | NNDiffChangeMove]];
});
});
});
SpecEnd