import Foundation

struct Tanaka {
  var credit: Int!

  init(credit: Int) {
    self.credit = credit
  }
}

struct CreditChecker {
  func canGraduate(_ tanaka: Tanaka) -> Bool {
    if tanaka.credit >= 128 {
      return true
    }

    return false
  }
}

import XCTest
@testable import TanakaGraduation

class CreditCheckerTests: XCTestCase {
  // | 境界値-1, 境界値, 境界値+1 |の値でテストを行う
  func test田中の単位数が127なので卒業できない() {
    let tanaka = Tanaka(credit: 127)
    let creditChecker = CreditChecker()
    XCTAssertFalse(creditChecker.canGraduate(tanaka))
  }

  func test田中の単位数が128なので卒業できる() {
    let tanaka = Tanaka(credit: 128)
    let creditChecker = CreditChecker()
    XCTAssertTrue(creditChecker.canGraduate(tanaka))
  }

  func test田中の単位数が129なので卒業できる() {
    let tanaka = Tanaka(credit: 129)
    let creditChecker = CreditChecker()
    XCTAssertTrue(creditChecker.canGraduate(tanaka))
  }
}