Swift: Update to package manager 5.1

swift/.gitignore

@@ -2,3 +2,4 @@
 /.build
 /Packages
 /*.xcodeproj
+xcuserdata/

swift/Package.swift

@@ -1,5 +1,23 @@
+// swift-tools-version:5.1
+
 import PackageDescription
 
 let package = Package(
-    name: "GildedRose"
+    name: "GildedRose",
+    products: [
+        .library(
+            name: "GildedRose",
+            targets: ["GildedRose"]),
+    ],
+    targets: [
+        .target(
+            name: "GildedRose",
+            dependencies: []),
+        .target(
+            name: "GildedRoseApp",
+            dependencies: ["GildedRose"]),
+        .testTarget(
+            name: "GildedRoseTests",
+            dependencies: ["GildedRose"]),
+    ]
 )

swift/Sources/GildedRose/GildedRose.swift

@@ -2,7 +2,7 @@
 public class GildedRose {
     var items:[Item]
     
-    required public init(items:[Item]) {
+    public init(items:[Item]) {
         self.items = items
     }
     

swift/Sources/GildedRoseApp/main.swift

@@ -1,3 +1,4 @@
+import GildedRose
 
 let items = [
     Item(name: "+5 Dexterity Vest", sellIn: 10, quality: 20),

swift/Tests/GildedRoseTests/XCTestManifests.swift

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

swift/Tests/LinuxMain.swift

@@ -1,7 +1,7 @@
-@testable import GildedRoseTestSuit
-
 import XCTest
 
-XCTMain([
-     testCase(GildedRoseTests.allTests),
-])
+import GildedRoseTests
+
+var tests = [XCTestCaseEntry]()
+tests += GildedRoseTests.allTests()
+XCTMain(tests)

swift/Tests/swiftTests/GildedRoseTests.swift

@@ -1,18 +0,0 @@
-@testable import GildedRose
-import XCTest
-
-class GildedRoseTests: XCTestCase {
-
-    func testFoo() {
-        let items = [Item(name: "foo", sellIn: 0, quality: 0)]
-        let app = GildedRose(items: items);
-        app.updateQuality();
-        XCTAssertEqual("fixme", app.items[0].name);
-    }
-
-    static var allTests : [(String, (GildedRoseTests) -> () throws -> Void)] {
-        return [
-            ("testFoo", testFoo),
-        ]
-    }
-}