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/*
* Copyright 2017 Google
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#import "Firestore/Source/Core/FSTTargetIDGenerator.h"
#import <XCTest/XCTest.h>
NS_ASSUME_NONNULL_BEGIN
@interface FSTTargetIDGenerator ()
- (instancetype)initWithGeneratorID:(NSInteger)generatorID startingAfterID:(FSTTargetID)after;
@end
@interface FSTTargetIDGeneratorTests : XCTestCase
@end
@implementation FSTTargetIDGeneratorTests
- (void)testConstructor {
XCTAssertEqual([[[FSTTargetIDGenerator alloc] initWithGeneratorID:0 startingAfterID:0] nextID],
2);
XCTAssertEqual([[[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:0] nextID],
1);
XCTAssertEqual([[FSTTargetIDGenerator generatorForLocalStoreStartingAfterID:0] nextID], 2);
XCTAssertEqual([[FSTTargetIDGenerator generatorForSyncEngineStartingAfterID:0] nextID], 1);
}
- (void)testSkipPast {
FSTTargetIDGenerator *gen =
[[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:-1];
XCTAssertEqual([gen nextID], 1);
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:2];
XCTAssertEqual([gen nextID], 3);
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:4];
XCTAssertEqual([gen nextID], 5);
for (int i = 4; i < 12; ++i) {
FSTTargetIDGenerator *gen0 =
[[FSTTargetIDGenerator alloc] initWithGeneratorID:0 startingAfterID:i];
FSTTargetIDGenerator *gen1 =
[[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:i];
XCTAssertEqual([gen0 nextID], i + 2 & ~1, @"Skip failed for index %d", i);
XCTAssertEqual([gen1 nextID], i + 1 | 1, @"Skip failed for index %d", i);
}
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:12];
XCTAssertEqual([gen nextID], 13);
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:0 startingAfterID:22];
XCTAssertEqual([gen nextID], 24);
}
- (void)testIncrement {
FSTTargetIDGenerator *gen =
[[FSTTargetIDGenerator alloc] initWithGeneratorID:0 startingAfterID:0];
XCTAssertEqual([gen nextID], 2);
XCTAssertEqual([gen nextID], 4);
XCTAssertEqual([gen nextID], 6);
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:0 startingAfterID:46];
XCTAssertEqual([gen nextID], 48);
XCTAssertEqual([gen nextID], 50);
XCTAssertEqual([gen nextID], 52);
XCTAssertEqual([gen nextID], 54);
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:0];
XCTAssertEqual([gen nextID], 1);
XCTAssertEqual([gen nextID], 3);
XCTAssertEqual([gen nextID], 5);
gen = [[FSTTargetIDGenerator alloc] initWithGeneratorID:1 startingAfterID:46];
XCTAssertEqual([gen nextID], 47);
XCTAssertEqual([gen nextID], 49);
XCTAssertEqual([gen nextID], 51);
XCTAssertEqual([gen nextID], 53);
}
@end
NS_ASSUME_NONNULL_END
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