SwiftLint/Tests/CoreTests/ExtendedNSStringTests.swift

import SourceKittenFramework
import Testing

@Suite
struct ExtendedNSStringTests {
    @Test
    func lineAndCharacterForByteOffset_forContentsContainingMultibyteCharacters() {
        let contents = "" +
        "import Foundation\n" +                               // 18 characters
        "class Test {\n" +                                    // 13 characters
            "func test() {\n" +                               // 14 characters
                "// 日本語コメント : comment in Japanese\n" +   // 33 characters
                "// do something\n" +                         // 16 characters
            "}\n" +
        "}"
        // A character placed on 80 offset indicates a white-space before 'do' at 5th line.
        if let lineAndCharacter = StringView(contents).lineAndCharacter(forCharacterOffset: 80) {
            #expect(lineAndCharacter.line == 5)
            #expect(lineAndCharacter.character == 3)
        } else {
            Issue.record("NSString.lineAndCharacterForByteOffset should return non-nil tuple.")
        }
    }
}