Unit test support in Swift Playgrounds

PlaygroundXCTest.swift

import XCTest

// MARK: Comparable ---
@discardableResult
public func assertGreaterThan<A: Comparable>(_ lhs: A, _ rhs: A) -> String {
    return lhs > rhs ? "✅" : "❌"
}

@discardableResult
public func assertGreaterThanOrEqual<A: Comparable>(_ lhs: A, _ rhs: A) -> String {
    return lhs >= rhs ? "✅" : "❌"
}

@discardableResult
public func assertLesserThan<A: Comparable>(_ lhs: A, _ rhs: A) -> String {
    return lhs < rhs ? "✅" : "❌"
}

@discardableResult
public func assertLesserThanOrEqual<A: Comparable>(_ lhs: A, _ rhs: A) -> String {
    return lhs <= rhs ? "✅" : "❌"
}

// MARK: Equatable ---
@discardableResult
public func assertEqual<A: Equatable>(_ lhs: A, _ rhs: A) -> String {
    return lhs == rhs ? "✅" : "❌"
}

// MARK: Optional ---
@discardableResult
public func assertNotNil<A>(_ lhs: A?) -> String {
    return lhs == nil ? "❌" : "✅"
}

@discardableResult
public func assertNil<A>(_ lhs: A?) -> String {
    return lhs != nil ? "❌" : "✅"
}

// MARK: Boolean ---
@discardableResult
public func assertTrue(_ lhs: Bool) -> String {
    return lhs == true ? "✅" : "❌"
}

@discardableResult
public func assertFalse(_ lhs: Bool) -> String {
    return assertTrue(lhs == false)
}