[Enhancement] Collection+Empty extension (#18)

This PR contains the work done to implement the "isNotEmpty" property in the Collection+Empty extension.

Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Reviewed-on: #18

Sources/Core/Extensions/Collection+Empty.swift

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 extension Collection {
+    
+    // MARK: Properties
+    
+    /// A Boolean value indicating whether a collection is not empty.
+    var isNotEmpty: Bool { !isEmpty }
+
+}

Tests/Core/Cases/Extensions/Collection+EmptyTests.swift

@@ -0,0 +1,75 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 XCTest
+
+final class Collection_EmptyTests: XCTestCase {
+
+    // MARK: Properties
+    
+    private var collection: (any Collection)!
+    private var result: Bool!
+
+    // MARK: Tests
+    
+    func test_isNotEmpty_whenAnArrayIsEmpty() {
+        // GIVEN
+        collection = [Int]()
+        
+        // WHEN
+        result = collection.isNotEmpty
+        
+        // THEN
+        XCTAssertFalse(result)
+    }
+    
+    func test_isNotEmpty_whenAnArrayIsNotEmpty() {
+        // GIVEN
+        collection = [0, 1, 2, 3, 4, 5]
+        
+        // WHEN
+        result = collection.isNotEmpty
+        
+        // THEN
+        XCTAssertTrue(result)
+    }
+    
+    func test_isNotEmpty_whenADictionaryIsEmpty() {
+        // GIVEN
+        collection = [String: Int]()
+        
+        // WHEN
+        result = collection.isNotEmpty
+        
+        // THEN
+        XCTAssertFalse(result)
+    }
+    
+    func test_isNotEmpty_whenADictionaryIsNotEmpty() {
+        // GIVEN
+        collection = [
+            "something": 0,
+            "else": 1,
+            "goes": 2,
+            "in": 3,
+            "here": 4
+        ]
+        
+        // WHEN
+        result = collection.isNotEmpty
+        
+        // THEN
+        XCTAssertTrue(result)
+    }
+
+}