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Add tests for out of bounds error #84
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // | ||
| // ExtendedPatchTests.swift | ||
| // DifferTests | ||
| // | ||
| // Created by Patrick Dinger on 2/6/22. | ||
| // Copyright © 2022 Differ Project. All rights reserved. | ||
| // | ||
|
|
||
| import XCTest | ||
| import Differ | ||
|
|
||
| class ExtendedPatchTests: XCTestCase { | ||
| func testDifferScenario1() throws { | ||
| let input = [1, 3, 4] | ||
| let output = [1, 2, 3, 4] | ||
| let result = runDiffer(start: input, end: output) | ||
| XCTAssertEqual(output, result) | ||
| } | ||
|
|
||
| func testDifferScenario2() throws { | ||
| let input = [1, 2, 3, 4] | ||
| let output = [1, 3, 4] | ||
| let result = runDiffer(start: input, end: output) | ||
| XCTAssertEqual(output, result) | ||
| } | ||
|
|
||
| func testDifferScenario3() throws { | ||
| let input = [1, 2, 3, 4] | ||
| let output = [4, 3, 2, 1] | ||
| let result = runDiffer(start: input, end: output) | ||
| XCTAssertEqual(output, result) | ||
| } | ||
|
|
||
| /// This fails: Thread 1: Fatal error: Index out of range | ||
| /// MOVE number from 8 4 [4, 4, 3, 8, 2, 5, 6, 9] | ||
| /// The array is only 8 elements long, not 9 | ||
| func testDifferScenarioFailure() throws { | ||
| let input = [7, 2, 5, 6, 9] | ||
| let output = [4, 4, 3, 8, 9, 5, 2, 5] | ||
| let result = runDiffer(start: input, end: output) | ||
| XCTAssertEqual(output, result) | ||
| } | ||
|
|
||
| /// This is another example of a failed scenario | ||
| func testDifferScenarioFailure_alternative() throws { | ||
| let input = [9, 0, 10, 5] | ||
| let output = [1, 2, 7, 5, 6, 5, 10, 6, 9, 10] | ||
| let result = runDiffer(start: input, end: output) | ||
| XCTAssertEqual(output, result) | ||
| } | ||
|
|
||
| func testDifferScenario5() throws { | ||
| let input = [7, 2, 5, 6, 9] | ||
| let output = [4, 4, 3, 8, 9, 5, 2, 5] | ||
| let result = runDiffer(start: input, end: output) | ||
| XCTAssertEqual(output, result) | ||
| } | ||
| } | ||
|
|
||
| private func runDiffer<T: Equatable>(start: [T], end: [T]) -> [T] { | ||
| let patches = Differ.extendedPatch(from: start, to: end) | ||
| var workingSet = start | ||
|
|
||
| for patch in patches { | ||
| switch patch { | ||
| case .insertion(index: let index, element: let element): | ||
| print("INSERT \(element) at", index) | ||
| workingSet.insert(element, at: index) | ||
| print(workingSet) | ||
| case .deletion(index: let index): | ||
| print("REMOVE \(workingSet[index]) at", index) | ||
| workingSet.remove(at: index) | ||
| print(workingSet) | ||
| case .move(from: let from, to: let to): | ||
| print("MOVE number from", from, to, workingSet) | ||
| let val = workingSet[from] | ||
| print(val) | ||
| workingSet.remove(at: from) | ||
| workingSet.insert(val, at: to) | ||
| print(workingSet) | ||
| } | ||
| } | ||
|
|
||
| return workingSet | ||
| } |
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