Implemented the "localisation(for:)" function of the Bundle+LocalisationBundle extension for the Core library.

Sources/Core/Errors/BundleError.swift

@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+public enum BundleError: Error {
+    case bundleNotFound
+}

Sources/Core/Extensions/Bundle+LocalisationBundle.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+import Foundation
+
+public extension Bundle {
+    
+    // MARK: Functions
+    
+    func localisation(for languageCode: String) throws -> Bundle {
+        guard
+            let path = path(forResource: languageCode, ofType: .ResourceType.localisationBundle),
+            let bundle = Bundle(path: path)
+        else {
+            throw BundleError.bundleNotFound
+        }
+        
+        return bundle
+    }
+
+}
+
+// MARK: - String+Constants
+
+private extension String {
+    enum ResourceType {
+        static let localisationBundle = "lproj"
+    }
+}

Tests/Core/Cases/Extensions/Bundle+LocalisationBundleTests.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+import Core
+import Foundation
+import XCTest
+
+final class Bundle_LocalisationBundleTests: XCTestCase {
+    
+    // MARK: Properties
+    
+    private let bundle = Bundle.module
+    
+    private var languageCode: String!
+
+    // MARK: Tests
+    
+    func test_localisation_withExistingLocalisationBundle() throws {
+        // GIVEN
+        languageCode = "en"
+        
+        // WHEN
+        let localisationBundle = try bundle.localisation(for: languageCode)
+        
+        // THEN
+        XCTAssertNotNil(localisationBundle)
+        XCTAssertEqual(localisationBundle.bundleURL.lastPathComponent, "en.lproj")
+    }
+    
+    func test_localisation_withNonExistingLocalisationBundle() throws {
+        // GIVEN
+        languageCode = "nl"
+        
+        // WHEN & THEN
+        XCTAssertThrowsError(try bundle.localisation(for: languageCode)) { error in
+            XCTAssertEqual(error as? BundleError, .bundleNotFound)
+        }
+    }
+
+}

Tests/Core/Resources/en.lproj/Localizable.strings

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+"test.core.bundle.some-localisable-string" = "Some localisable string to use for testing purposes.";
+"test.core.bundle.other-localisable-string" = "Other localisable string to use for testing purposes.";