Repair GenerationTests on Windows (#6354)

Author: compnerd

Source/SwiftLintBuiltInRules/Rules/Lint/UnusedImportRuleExamples.swift

@@ -190,7 +190,7 @@ struct UnusedImportRuleExamples {
                     "allowed_transitive_imports": ["CoreFoundation", "Dispatch"],
                 ] as [String: any Sendable],
             ],
-        ] as [String: any Sendable], testMultiByteOffsets: false, testOnLinux: false):
+        ] as [String: any Sendable], testMultiByteOffsets: false, testOnLinux: false, testOnWindows: false):
             Example("""
             import Foundation
             typealias Foo = CFArray
@@ -202,7 +202,7 @@ struct UnusedImportRuleExamples {
         dispatchMain()
         """, configuration: [
             "require_explicit_imports": true
-        ], testMultiByteOffsets: false, testOnLinux: false):
+        ], testMultiByteOffsets: false, testOnLinux: false, testOnWindows: false):
             Example("""
             import CoreFoundation
             import Dispatch
@@ -236,7 +236,7 @@ struct UnusedImportRuleExamples {
         class A {}
         """, configuration: [
             "require_explicit_imports": true
-        ], testMultiByteOffsets: false, testOnLinux: false):
+        ], testMultiByteOffsets: false, testOnLinux: false, testOnWindows: false):
             Example("""
             import CoreFoundation
             import Foundation

Source/SwiftLintCore/Models/Example.swift

@@ -28,6 +28,8 @@ public struct Example: Sendable {
     package private(set) var testDisableCommand: Bool
     /// Whether the example should be tested on Linux
     public private(set) var testOnLinux: Bool
+    /// Whether the example should be tested on Windows
+    public private(set) var testOnWindows: Bool
     /// The path to the file where the example was created
     public private(set) var file: StaticString
     /// The line in the file where the example was created
@@ -68,13 +70,15 @@ public extension Example {
          testWrappingInString: Bool = true,
          testDisableCommand: Bool = true,
          testOnLinux: Bool = true,
+         testOnWindows: Bool = true,
          file: StaticString = #filePath,
          line: UInt = #line,
          excludeFromDocumentation: Bool = false) {
         self.code = code
         self.configuration = configuration
         self.testMultiByteOffsets = testMultiByteOffsets
         self.testOnLinux = testOnLinux
+        self.testOnWindows = testOnWindows
         self.file = file
         self.line = line
         self.excludeFromDocumentation = excludeFromDocumentation

Tests/TestHelpers/TestHelpers.swift

@@ -4,6 +4,45 @@ import XCTest
 
 import SwiftLintFramework
 
+#if os(Windows)
+private struct PlatformInfo {
+    struct DefaultProperties {
+        let versionXCTest: String
+        let versionSwiftTesting: String
+        let swiftFlags: [String]?
+    }
+
+    let defaults: DefaultProperties
+}
+
+extension PlatformInfo.DefaultProperties: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case versionXCTest = "XCTEST_VERSION"
+        case versionSwiftTesting = "SWIFT_TESTING_VERSION"
+        case swiftFlags = "SWIFTC_FLAGS"
+    }
+}
+
+extension PlatformInfo: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case defaults = "DefaultProperties"
+    }
+}
+
+private let info: PlatformInfo = {
+    let sdk = URL(fileURLWithPath: sdkPath(), isDirectory: true)
+        .deletingLastPathComponent()
+        .deletingLastPathComponent()
+        .deletingLastPathComponent()
+        .appendingPathComponent("Info.plist")
+    guard let data = try? Data(contentsOf: sdk),
+          let info = try? PropertyListDecoder().decode(PlatformInfo.self, from: data) else {
+        fatalError("invalid platform SDK - couldn't decode \(sdk.path)")
+    }
+    return info
+}()
+#endif
+
 // swiftlint:disable file_length
 
 private let violationMarker = "↓"
@@ -28,12 +67,29 @@ private extension SwiftLintFile {
             .appendingPathComponent("Library")
             .appendingPathComponent("Frameworks")
             .path
-        return [
-            "-F",
-            frameworks,
+
+        let arguments = [
+            "-F", frameworks,
             "-sdk", sdk,
-            "-j4", path!,
+            "-Xfrontend", "-enable-objc-interop",
+            "-j4",
+            path!,
         ]
+#if os(Windows)
+        let XCTestPath = URL(fileURLWithPath: sdk, isDirectory: true)
+            .deletingLastPathComponent()
+            .deletingLastPathComponent()
+            .appendingPathComponent("Library")
+            .appendingPathComponent("XCTest-\(info.defaults.versionXCTest)")
+            .appendingPathComponent("usr")
+            .appendingPathComponent("lib")
+            .appendingPathComponent("swift")
+            .appendingPathComponent("windows")
+            .path
+        return ["-I", XCTestPath] + arguments
+#else
+        return arguments
+#endif
     }
 }
 
@@ -265,6 +321,11 @@ private func testCorrection(_ correction: (Example, Example),
     guard correction.0.testOnLinux else {
         return
     }
+#endif
+#if os(Windows)
+    guard correction.0.testOnWindows else {
+        return
+    }
 #endif
     var config = configuration
     if let correctionConfiguration = correction.0.configuration,