safe-ios/Packages/Ethereum/Tests/SolidityTests/StringEncodingTests.swift

//
//  File.swift
//  
//
//  Created by Dmitry Bespalov on 03.01.22.
//

import Foundation
import Solidity
import XCTest

class StringEncodingTests: XCTestCase {
    func testEncode() {
        let value = Sol.String(storage: "Hello, world!")
        let data = value.encode()
        let expected = Data([
            // length: 13 bytes (uint256)
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 16 bytes
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0d, // 32 bytes
            // pad_right(data)
            0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, // 16 bytes
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 32 bytes
        ])
        XCTAssertEqual(Array(data), Array(expected))
    }

    func testDecode() throws {
        let expected = Sol.String(storage: "Hello, world!")
        let data = Data([
            // length: 13 bytes (uint256)
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 16 bytes
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0d, // 32 bytes
            // pad_right(data)
            0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00, 0x00, // 16 bytes
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 32 bytes
        ])
        var offset = 0
        let value = try Sol.String(from: data, offset: &offset)
        XCTAssertEqual(value, expected)
        XCTAssertEqual(offset, 64)
    }
}