Testを追加

Package.swift

@@ -34,6 +34,13 @@ let package = Package(
                 .product(name: "SwiftSyntax", package: "swift-syntax"),
                 .product(name: "SwiftParser", package: "swift-syntax")
             ]
+        ),
+        .testTarget(
+            name: "SorterTests",
+            dependencies: [
+                "SorterCore",
+                .product(name: "SwiftParser", package: "swift-syntax")
+            ]
         )
     ]
 )

Tests/SorterTests/SorterTests.swift

@@ -0,0 +1,50 @@
+// 
+//  SorterTests.swift
+//  
+//
+//  Created by ryunosuke.shibuya on 2023/05/20.
+//
+
+import Foundation
+import XCTest
+@testable import SorterCore
+import SwiftParser
+
+final class SorterTests: XCTestCase {
+    func testEmptyRewriter() {
+
+        let `enum` =
+        """
+        enum E1 {
+            case b
+            case a
+            case j
+            case h
+            case i
+            case e
+            case d
+            case g
+            case f
+            case c
+        }
+        """
+        let expected =
+        """
+        enum E1 {
+            case a
+            case b
+            case c
+            case d
+            case e
+            case f
+            case g
+            case h
+            case i
+            case j
+        }
+        """
+        let syntax = Parser.parse(source: `enum`)
+        let formatted = EnumSortRewriter().visit(syntax)
+        XCTAssertEqual(formatted.description, expected)
+    }
+}