[Feature] Some basic core feature (#1)

This PR refers to the work done on setting the `Core` target as well as implemented some basic features as extension to a pair of `Swift` primitive types.

To give further details about this work:
- [x] defined the `Core` target;
- [x] implemented the **empty** static property and the **isNotEmpty()** function in the `String+Empty` extension;
- [x] implemented the **init(_: )** initialiser fo strings in the `Bool+Init` extension;

Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Reviewed-on: #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

@@ -0,0 +1,55 @@
+//
+//  String+EmptyTests.swift
+//  Core
+//
+//  Created by Javier Cicchelli on 15/04/2023.
+//  Copyright © 2022 Röck+Cöde. All rights reserved.
+//
+
+import Core
+import XCTest
+
+final class String_EmptyTests: XCTestCase {
+
+    // MARK: Tests
+
+    func test_empty() {
+        // GIVEN
+        let string = String.empty
+        
+        // WHEN
+        // THEN
+        XCTAssertEqual(string, "")
+    }
+    
+    func test_isNotEmpty_withEmptyString() {
+        // GIVEN
+        let string = String.empty
+        
+        // WHEN
+        let result = string.isNotEmpty()
+        
+        // THEN
+        XCTAssertFalse(result)
+    }
+    
+    func test_isNotEmpty_withFilledString() {
+        // GIVEN
+        let string = String.Test.string
+        
+        // WHEN
+        let result = string.isNotEmpty()
+        
+        // THEN
+        XCTAssertTrue(result)
+    }
+
+}
+
+// MARK: - String+Constants
+
+private extension String {
+    enum Test {
+        static let string = "Some test string..."
+    }
+}

Tests/SwiftLibsTests/SwiftLibsTests.swift

@@ -1,11 +0,0 @@
-import XCTest
-@testable import SwiftLibs
-
-final class SwiftLibsTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(SwiftLibs().text, "Hello, World!")
-    }
-}