Implemented the "init(_: )" initialiser in the Bool+Init extension.

Sources/Core/Extensions/Bool+Init.swift

@@ -0,0 +1,37 @@
+//
+//  Bool+Init.swift
+//  Core
+//
+//  Created by Javier Cicchelli on 15/04/2023.
+//  Copyright © 2023 Röck+Cöde. All rights reserved.
+//
+
+public extension Bool {
+    
+    // MARK: Initialisers
+
+    /// Initialise a boolean primitive out of a given string.
+    /// - Parameter string: A string to initialise the boolean with.
+    init(_ string: String) {
+        let strings: [String] = [
+            .Constants.oneNumber,
+            .Constants.oneWord,
+            .Constants.true,
+            .Constants.yes
+        ]
+        
+        self = strings.contains(string.lowercased())
+    }
+    
+}
+
+// MARK: - String+Constants
+
+private extension String {
+    enum Constants {
+        static let yes = "yes"
+        static let `true` = "true"
+        static let oneWord = "one"
+        static let oneNumber = "1"
+    }
+}

Tests/Core/Extensions/Bool+InitTests.swift

@@ -0,0 +1,60 @@
+//
+//  Bool+InitTests.swift
+//  Core
+//
+//  Created by Javier Cicchelli on 15/04/2023.
+//  Copyright © 2023 Röck+Cöde. All rights reserved.
+//
+
+import Core
+import XCTest
+
+final class Bool_InitTests: XCTestCase {
+    
+    // MARK: Properties
+    
+    private var strings: [String] = []
+    private var booleans: [Bool] = []
+
+    // MARK: Tests
+    
+    func test_init_withPositiveStrings() {
+        // GIVEN
+        strings = ["YES", "Yes", "yes", "TRUE", "TrUe", "true", "One", "OnE", "one", "1"]
+        
+        // WHEN
+        booleans = strings.map(Bool.init)
+        
+        // THEN
+        booleans.forEach { boolean in
+            XCTAssertTrue(boolean)
+        }
+    }
+    
+    func test_init_withNegativeStrings() {
+        // GIVEN
+        strings = ["NO", "No", "no", "FALSE", "FaLsE", "false", "ZERO", "ZeRo", "zero", "0"]
+        
+        // WHEN
+        booleans = strings.map(Bool.init)
+        
+        // THEN
+        booleans.forEach { boolean in
+            XCTAssertFalse(boolean)
+        }
+    }
+    
+    func test_init_withOtherStrings() {
+        // GIVEN
+        strings = [.empty, "...", "something", "yes-", "false+", "X", "9"]
+        
+        // WHEN
+        booleans = strings.map(Bool.init)
+        
+        // THEN
+        booleans.forEach { boolean in
+            XCTAssertFalse(boolean)
+        }
+    }
+
+}

Tests/Core/Extensions/String+EmptyTests.swift

@@ -6,10 +6,9 @@
 //  Copyright © 2022 Röck+Cöde. All rights reserved.
 //
 
+import Core
 import XCTest
 
-@testable import Core
-
 final class String_EmptyTests: XCTestCase {
 
     // MARK: Tests