Create Swift Package

.swiftpm/xcode/package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Package.swift

@@ -0,0 +1,28 @@
+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Calculator",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "Calculator",
+            targets: ["Calculator"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "Calculator",
+            dependencies: []),
+        .testTarget(
+            name: "CalculatorTests",
+            dependencies: ["Calculator"]),
+    ]
+)

README.md

@@ -0,0 +1,3 @@
+# Calculator
+
+A description of this package.

Sources/Calculator/Calculator.swift

@@ -0,0 +1,8 @@
+public class Calculator {
+
+    public init() {}
+
+    public func multitply(_ valueX: Int, with valueY: Int) -> Int {
+        return valueX * valueY
+    }
+}

Tests/CalculatorTests/CalculatorTests.swift

@@ -0,0 +1,23 @@
+import XCTest
+@testable import Calculator
+
+final class CalculatorTests: XCTestCase {
+    var calculator: Calculator!
+
+    override func setUp() {
+        calculator = Calculator()
+    }
+
+    func test_should_return_nice_when_multiplying_three_with_three() {
+        let valueX = 3
+        let valueY = 3
+
+        let result = calculator.multitply(valueX, with: valueY)
+
+        XCTAssertEqual(result, 9)
+    }
+
+    static var allTests = [
+        ("test_should_return_nice_when_multiplying_three_with_three", test_should_return_nice_when_multiplying_three_with_three),
+    ]
+}

Tests/CalculatorTests/XCTestManifests.swift

@@ -0,0 +1,9 @@
+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(CalculatorTests.allTests),
+    ]
+}
+#endif

Tests/LinuxMain.swift

@@ -0,0 +1,7 @@
+import XCTest
+
+import CalculatorTests
+
+var tests = [XCTestCaseEntry]()
+tests += CalculatorTests.allTests()
+XCTMain(tests)