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ArrayDiffingTests.mm
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//
// ArrayDiffingTests.mm
// Texture
//
// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
//
#import <XCTest/XCTest.h>
#import <AsyncDisplayKit/NSArray+Diffing.h>
@interface NSArray (ArrayDiffingTests)
- (NSIndexSet *)_asdk_commonIndexesWithArray:(NSArray *)array compareBlock:(BOOL (^)(id lhs, id rhs))comparison;
@end
@interface ArrayDiffingTests : XCTestCase
@end
@implementation ArrayDiffingTests
- (void)testDiffingCommonIndexes
{
NSArray<NSArray *> *tests = @[
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"alice", @"dave", @"gary"],
@[@0, @1, @2]
],
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"gary", @"dave"],
@[@0, @2]
],
@[
@[@"bob", @"alice"],
@[@"gary", @"dave"],
@[],
],
@[
@[@"bob", @"alice", @"dave"],
@[],
@[],
],
@[
@[],
@[@"bob", @"alice", @"dave"],
@[],
],
];
for (NSArray *test in tests) {
NSIndexSet *indexSet = [test[0] _asdk_commonIndexesWithArray:test[1] compareBlock:^BOOL(id lhs, id rhs) {
return [lhs isEqual:rhs];
}];
NSMutableIndexSet *mutableIndexSet = [indexSet mutableCopy];
for (NSNumber *index in (NSArray *)test[2]) {
XCTAssert([indexSet containsIndex:[index integerValue]]);
[mutableIndexSet removeIndex:[index integerValue]];
}
XCTAssert([mutableIndexSet count] == 0, @"Unaccounted deletions: %@", mutableIndexSet);
}
}
- (void)testDiffingInsertionsAndDeletions {
NSArray<NSArray *> *tests = @[
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"alice", @"dave", @"gary"],
@[@3],
@[],
],
@[
@[@"a", @"b", @"c", @"d"],
@[@"d", @"c", @"b", @"a"],
@[@1, @2, @3],
@[@0, @1, @2],
],
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"gary", @"alice", @"dave"],
@[@1],
@[],
],
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"alice"],
@[],
@[@2],
],
@[
@[@"bob", @"alice", @"dave"],
@[],
@[],
@[@0, @1, @2],
],
@[
@[@"bob", @"alice", @"dave"],
@[@"gary", @"alice", @"dave", @"jack"],
@[@0, @3],
@[@0],
],
@[
@[@"bob", @"alice", @"dave", @"judy", @"lynda", @"tony"],
@[@"gary", @"bob", @"suzy", @"tony"],
@[@0, @2],
@[@1, @2, @3, @4],
],
@[
@[@"bob", @"alice", @"dave", @"judy"],
@[@"judy", @"dave", @"alice", @"bob"],
@[@1, @2, @3],
@[@0, @1, @2],
],
];
long n = 0;
for (NSArray *test in tests) {
NSIndexSet *insertions, *deletions;
[test[0] asdk_diffWithArray:test[1] insertions:&insertions deletions:&deletions];
NSMutableIndexSet *mutableInsertions = [insertions mutableCopy];
NSMutableIndexSet *mutableDeletions = [deletions mutableCopy];
for (NSNumber *index in (NSArray *)test[2]) {
XCTAssert([mutableInsertions containsIndex:[index integerValue]], @"Test #%ld: insertions %@ does not contain %@",
n, insertions, index);
[mutableInsertions removeIndex:[index integerValue]];
}
for (NSNumber *index in (NSArray *)test[3]) {
XCTAssert([mutableDeletions containsIndex:[index integerValue]], @"Test #%ld: deletions %@ does not contain %@",
n, deletions, index
);
[mutableDeletions removeIndex:[index integerValue]];
}
XCTAssert([mutableInsertions count] == 0, @"Test #%ld: Unaccounted insertions: %@", n, mutableInsertions);
XCTAssert([mutableDeletions count] == 0, @"Test #%ld: Unaccounted deletions: %@", n, mutableDeletions);
n++;
}
}
- (void)testDiffingInsertsDeletesAndMoves
{
NSArray<NSArray *> *tests = @[
@[
@[@"a", @"b"],
@[@"b", @"a"],
@[],
@[],
@[[NSIndexPath indexPathWithIndexes:(NSUInteger[]) {1, 0} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]) {0, 1} length:2]
]],
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"alice", @"dave", @"gary"],
@[@3],
@[],
@[]],
@[
@[@"a", @"b", @"c", @"d"],
@[@"d", @"c", @"b", @"a"],
@[],
@[],
@[[NSIndexPath indexPathWithIndexes:(NSUInteger[]){3, 0} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){2, 1} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){1, 2} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){0, 3} length:2]
]],
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"gary", @"dave", @"alice"],
@[@1],
@[],
@[[NSIndexPath indexPathWithIndexes:(NSUInteger[]) {1, 3} length:2]
]],
@[
@[@"bob", @"alice", @"dave"],
@[@"bob", @"alice"],
@[],
@[@2],
@[]],
@[
@[@"bob", @"alice", @"dave"],
@[],
@[],
@[@0, @1, @2],
@[]],
@[
@[@"bob", @"alice", @"dave"],
@[@"gary", @"alice", @"dave", @"jack"],
@[@0, @3],
@[@0],
@[]],
@[
@[@"bob", @"alice", @"dave", @"judy", @"lynda", @"tony"],
@[@"gary", @"bob", @"suzy", @"tony"],
@[@0, @2],
@[@1, @2, @3, @4],
@[[NSIndexPath indexPathWithIndexes:(NSUInteger[]){0, 1} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){5, 3} length:2]
]],
@[
@[@"bob", @"alice", @"dave", @"judy"],
@[@"judy", @"dave", @"alice", @"bob"],
@[],
@[],
@[[NSIndexPath indexPathWithIndexes:(NSUInteger[]){3, 0} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){2, 1} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){1, 2} length:2],
[NSIndexPath indexPathWithIndexes:(NSUInteger[]){0, 3} length:2]
]]
];
long n = 0;
for (NSArray *test in tests) {
NSIndexSet *insertions, *deletions;
NSArray<NSIndexPath *> *moves;
[test[0] asdk_diffWithArray:test[1] insertions:&insertions deletions:&deletions moves:&moves];
NSMutableIndexSet *mutableInsertions = [insertions mutableCopy];
NSMutableIndexSet *mutableDeletions = [deletions mutableCopy];
for (NSNumber *index in (NSArray *) test[2]) {
XCTAssert([mutableInsertions containsIndex:[index integerValue]], @"Test #%ld, insertions does not contain %ld",
n, (long)[index integerValue]);
[mutableInsertions removeIndex:(NSUInteger) [index integerValue]];
}
for (NSNumber *index in (NSArray *) test[3]) {
XCTAssert([mutableDeletions containsIndex:[index integerValue]], @"Test #%ld, deletions does not contain %ld",
n, (long)[index integerValue]);
[mutableDeletions removeIndex:(NSUInteger) [index integerValue]];
}
XCTAssert([mutableInsertions count] == 0, @"Test #%ld, Unaccounted insertions: %@", n, mutableInsertions);
XCTAssert([mutableDeletions count] == 0, @"Test #%ld, Unaccounted deletions: %@", n, mutableDeletions);
XCTAssert([moves isEqual:test[4]], @"Test #%ld, %@ !isEqual: %@", n, moves, test[4]);
n++;
}
}
- (void)testArrayDiffingRebuildingWithRandomElements
{
NSArray<NSNumber *> *original = @[];
NSArray<NSNumber *> *pending = @[];
NSIndexSet *insertions = nil;
NSIndexSet *deletions = nil;
NSArray<NSIndexPath *> *moves;
for (int testNumber = 0; testNumber <= 25; testNumber++) {
int len = arc4random_uniform(10);
for (int j = 0; j < len; j++) {
original = [original arrayByAddingObject:@(arc4random_uniform(25))];
}
len = arc4random_uniform(10);
for (int j = 0; j < len; j++) {
pending = [pending arrayByAddingObject:@(arc4random_uniform(25))];
}
// Some sequences that presented issues in the past:
if (testNumber == 0) {
original = @[@20, @11, @14, @2, @14, @5, @4, @18, @0];
pending = @[@9, @18, @18, @19, @20, @18, @22, @10, @3];
}
if (testNumber == 1) {
original = @[@5, @9, @21, @11, @5, @9, @8];
pending = @[@2, @12, @17, @19, @9, @1, @8, @5, @21];
}
if (testNumber == 2) {
original = @[@14, @14, @12, @8, @20, @4, @0, @10];
pending = @[@14];
}
[original asdk_diffWithArray:pending insertions:&insertions deletions:&deletions moves:&moves];
NSMutableArray *deletionsList = [NSMutableArray new];
[deletions enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
[deletionsList addObject:@(idx)];
}];
NSMutableArray *insertionsList = [NSMutableArray new];
[insertions enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
[insertionsList addObject:@(idx)];
}];
NSUInteger i = 0;
NSUInteger j = 0;
NSMutableArray<NSNumber *> *test = [NSMutableArray new];
for (NSUInteger count = 0; count < [pending count]; count++) {
if (i < [insertionsList count] && [insertionsList[i] unsignedIntegerValue] == count) {
[test addObject:pending[[insertionsList[i] unsignedIntegerValue]]];
i++;
} else if (j < [moves count] && [moves[j] indexAtPosition:1] == count) {
[test addObject:original[[moves[j] indexAtPosition:0]]];
j++;
} else {
[test addObject:original[count]];
}
}
XCTAssert([test isEqualToArray:pending], @"Did not mutate to expected new array:\n [%@] -> [%@], actual: [%@]\ninsertions: %@\nmoves: %@\ndeletions: %@",
[original componentsJoinedByString:@","], [pending componentsJoinedByString:@","], [test componentsJoinedByString:@","],
insertions, moves, deletions);
original = @[];
pending = @[];
}
}
@end