Add tests

highlight-swift/Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.6
+// swift-tools-version: 5.7
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -7,6 +7,7 @@ let package = Package(
     name: "highlight-swift",
     platforms: [
         .macOS(.v11),
+        .iOS(.v16),
     ],
     products: [
         // Products define the executables and libraries a package produces, and make them visible to other packages.
@@ -25,5 +26,6 @@ let package = Package(
         .target(
             name: "highlight-swift",
             dependencies: ["Splash"]),
+        .testTarget(name: "highlight-swift-tests", dependencies: ["highlight-swift"])
     ]
 )

highlight-swift/Tests/LinuxMain.swift

@@ -0,0 +1,5 @@
+import XCTest
+
+XCTMain([
+    testCase(HighlightTests.allTests),
+])

highlight-swift/Tests/highlight-swift-tests/HighlightTests.swift

@@ -0,0 +1,30 @@
+//
+//  HighlightTests.swift
+//  
+//
+//  Created by Shadowfacts on 12/10/22.
+//
+
+import XCTest
+@testable import highlight_swift
+
+class HighlightTests: XCTestCase {
+    static var allTests = [
+        ("testHighlight", testHighlight),
+    ]
+    
+    func testHighlight() {
+        var code = "1+1"
+        var len: UInt64 = 0
+        let result = code.withUTF8 { codePtr in
+            withUnsafeMutablePointer(to: &len) { lenPtr in
+                highlight(codePtr: UnsafeRawPointer(codePtr.baseAddress!), codeLen: UInt64(codePtr.count), htmlLenPtr: lenPtr)
+            }
+        }
+        let start = UnsafePointer(result.assumingMemoryBound(to: UInt8.self))
+        let htmlPtr = UnsafeBufferPointer(start: start, count: Int(len))
+        let data = Data(buffer: htmlPtr)
+        let expected = "<span class=\"hl-num\">1</span>+<span class=\"hl-num\">1</span>"
+        XCTAssertEqual(String(data: data, encoding: .utf8), expected)
+    }
+}