Use swift package manager

Blockchain/.gitignore

@@ -0,0 +1,5 @@
+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/

Blockchain/Package.swift

@@ -0,0 +1,22 @@
+// 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: "Blockchain",
+    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: "Blockchain",
+            dependencies: []),
+        .testTarget(
+            name: "BlockchainTests",
+            dependencies: ["Blockchain"]),
+    ]
+)

Blockchain/README.md

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

Blockchain/Sources/Blockchain/Models/Block.swift

@@ -7,7 +7,6 @@
 //
 
 import Foundation
-import CryptoKit
 
 class Block {
     var hash: String!
@@ -16,10 +15,6 @@ class Block {
     var index: Int!
     
     func generateHash() -> String {
-        if let hashData = data.data(using: .utf8) {
-            _ = SHA256.hash(data: hashData)
-        }
-        
         return NSUUID().uuidString.replacingOccurrences(of: "-", with: "")
     }
 }

Blockchain/Sources/Blockchain/main.swift

@@ -24,7 +24,7 @@ repeat {
     }
     
     if command == "spam" {
-        for _ in 1...1000000 {
+        for _ in 1...1000 {
             blockchain.createBlock(data: "\((blockchain.chain.last?.index ?? 0)+1)")
         }
     }

Blockchain/Tests/BlockchainTests/BlockchainTests.swift

@@ -0,0 +1,47 @@
+import XCTest
+import class Foundation.Bundle
+
+final class BlockchainTests: 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.
+
+        // Some of the APIs that we use below are available in macOS 10.13 and above.
+        guard #available(macOS 10.13, *) else {
+            return
+        }
+
+        let fooBinary = productsDirectory.appendingPathComponent("Blockchain")
+
+        let process = Process()
+        process.executableURL = fooBinary
+
+        let pipe = Pipe()
+        process.standardOutput = pipe
+
+        try process.run()
+        process.waitUntilExit()
+
+        let data = pipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(data: data, encoding: .utf8)
+
+        XCTAssertEqual(output, "Hello, world!\n")
+    }
+
+    /// Returns path to the built products directory.
+    var productsDirectory: URL {
+      #if os(macOS)
+        for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
+            return bundle.bundleURL.deletingLastPathComponent()
+        }
+        fatalError("couldn't find the products directory")
+      #else
+        return Bundle.main.bundleURL
+      #endif
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Blockchain/Tests/BlockchainTests/XCTestManifests.swift

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

Blockchain/Tests/LinuxMain.swift

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