CommandLine.ArgumentsTests.swift

//
//  CommandLine.ArgumentsTests.swift
//  SwiftDraw
//
//  Created by Simon Whitty on 7/12/18.
//  Copyright 2020 Simon Whitty
//
//  Distributed under the permissive zlib license
//  Get the latest version from here:
//
//  https://github.com/swhitty/SwiftDraw
//
//  This software is provided 'as-is', without any express or implied
//  warranty.  In no event will the authors be held liable for any damages
//  arising from the use of this software.
//
//  Permission is granted to anyone to use this software for any purpose,
//  including commercial applications, and to alter it and redistribute it
//  freely, subject to the following restrictions:
//
//  1. The origin of this software must not be misrepresented; you must not
//  claim that you wrote the original software. If you use this software
//  in a product, an acknowledgment in the product documentation would be
//  appreciated but is not required.
//
//  2. Altered source versions must be plainly marked as such, and must not be
//  misrepresented as being the original software.
//
//  3. This notice may not be removed or altered from any source distribution.
//

import XCTest
@testable import SwiftDraw

final class CommandLineArgumentsTests: XCTestCase {

  func testParseModifiers() throws {
    let modifiers = try CommandLine.parseModifiers(from: ["--format", "some", "--output", "more", "--scale", "magnify", "--size", "huge"])
    XCTAssertEqual(modifiers, [.format: "some", .output: "more", .scale: "magnify", .size: "huge"])
  }

  func testParseModifiersThrowsForOddPairs() {
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["--format"]))
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["--format", "png", "--output"]))
  }

  func testParseModifiersThrowsForDuplicateModifiers() {
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["--format", "png", "--format", "jpg"]))
    XCTAssertThrowsError(try CommandLine.parseModifiers(from:  ["--format", "png", "--output", "more", "--output", "evenmore"]))
  }

  func testParseModifiersThrowsForUnknownModifiers() {
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["--unknown", "png"]))
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["--format", "png", "--unknown", "more"]))
  }

  func testParseModifiersThrowsForMissingPrefix() {
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["format", "png"]))
    XCTAssertThrowsError(try CommandLine.parseModifiers(from: ["--format", "png", "output", "more"]))
  }

}