Remove the unused TestMeasurementParser and lint integration tests again. (#3918)

IntegrationTests/Sources/TestMeasurementParser.swift

@@ -1,112 +0,0 @@
-//
-// Copyright 2022-2024 New Vector Ltd.
-//
-// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
-// Please see LICENSE files in the repository root for full details.
-//
-
-import Foundation
-import XCTest
-
-enum TestMeasurementParserMetric: String {
-    case appLaunch = "Duration (AppLaunch)"
-    case clockMonotonicTime = "Clock Monotonic Time"
-    case cpuTime = "CPU Time"
-    case memoryPeakPhysical = "Memory Peak Physical"
-    case memoryPhysical = "Memory Physical"
-    case cpuInstructionsRetired = "CPU Instructions Retired"
-    case diskLogicalWrites = "Disk Logical Writes"
-    case cpuCycles = "CPU Cycles"
-    
-    var regexValue: String {
-        switch self {
-        case .appLaunch:
-            return rawValue.replacingOccurrences(of: "(", with: "\\(").replacingOccurrences(of: ")", with: "\\)")
-        default:
-            return rawValue
-        }
-    }
-}
-
-/// This class is responsible for extracting XCTest measurement run results from stderr in lieu of an official API
-/// Heavily inspired by https://stackoverflow.com/questions/54814422/how-to-extract-performance-metrics-measured-by-measureblock-in-xctest
-final class TestMeasurementParser {
-    private let pipe = Pipe()
-    private let regex: NSRegularExpression
-    private var results = [String: Double]()
-    
-    init() {
-        do {
-            let pattern = """
-            \\[(\
-            \(TestMeasurementParserMetric.appLaunch.regexValue)|\
-            \(TestMeasurementParserMetric.clockMonotonicTime.regexValue)|\
-            \(TestMeasurementParserMetric.cpuTime.regexValue)|\
-            \(TestMeasurementParserMetric.memoryPeakPhysical.regexValue)|\
-            \(TestMeasurementParserMetric.memoryPhysical.regexValue)|\
-            \(TestMeasurementParserMetric.cpuInstructionsRetired.regexValue)|\
-            \(TestMeasurementParserMetric.diskLogicalWrites.regexValue)|\
-            \(TestMeasurementParserMetric.cpuCycles.regexValue)\
-            ), \
-            (s|kB|kI|kC)\\] \
-            average: ([0-9\\.]*),
-            """
-            
-            regex = try NSRegularExpression(pattern: pattern,
-                                            options: .caseInsensitive)
-        } catch {
-            fatalError("Invalid regular expression")
-        }
-    }
-    
-    /// Running an XCTest measure block within this will enable the `XCTestMeasurementParser` to read resulting values from stderr and store them locally
-    /// - Parameters:
-    ///   - testCase: we need the test case so that we can add and wait for an expectation on it, allowing the capturing to finish
-    ///   - block: should contain the normal test steps and measure block
-    func capture(testCase: XCTestCase, block: @escaping () -> Void) {
-        results.removeAll()
-        
-        // Save original output
-        let original = dup(STDERR_FILENO)
-        
-        // Configure `stderr` so that it's not buffered
-        setvbuf(stderr, nil, _IONBF, 0)
-        
-        dup2(pipe.fileHandleForWriting.fileDescriptor, STDERR_FILENO)
-        
-        pipe.fileHandleForReading.readabilityHandler = { [weak self] handle in
-            guard let self else {
-                return
-            }
-            
-            let string = String(data: handle.availableData, encoding: .utf8) ?? "<Non-ascii data of size\(handle.availableData.count)>\n"
-            self.regex.matches(in: string, options: .reportCompletion).forEach {
-                if let nameIndex = Range($0.range(at: 1), in: string),
-                   let averageIndex = Range($0.range(at: 3), in: string) {
-                    let name = String(string[nameIndex])
-                    let average = Double(string[averageIndex])
-                    
-                    self.results[name] = average
-                }
-            }
-            
-            // Print to stdout because stderr is piped
-            print("\(string)")
-        }
-        
-        block()
-        
-        // Revert
-        fflush(stderr)
-        dup2(original, STDERR_FILENO)
-        close(original)
-        
-        // Allow the parser to finish
-        let expectation = testCase.expectation(description: "Wait for the results to be gathered")
-        DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
-            expectation.fulfill()
-        }
-        
-        testCase.waitForExpectations(timeout: 10.0)
-    }
-}