Assert helper that provides a few functions for asserting while debugging

Assert.swift

public final class Assert {
    public static var shouldCrashOnDebug = true
    fileprivate static var isUnitTesting = NSClassFromString("XCTest") != nil
}

public func debugAssertion(_ condition: @autoclosure () -> Bool, message: String = "") {
    #if DEBUG || STAGE

    if !condition() {
        if Assert.shouldCrashOnDebug {
            assertionFailure(message)
        } else {
            print("\n\n💥💣💥Assert DEBUG fatal error: \(message)\n\n")
        }
    }

    #endif
}

public func debugFailure(_ message: String) {
    #if DEBUG || STAGE

        if !Assert.shouldCrashOnDebug {
            print("\n\n💥💣💥Assert DEBUG fatal error: \(message)\n\n")
        } else if !Assert.isUnitTesting {
            assertionFailure("\n\n💥💣💥 " + message)
        }

    #endif
}

public func debugAssertNotMainThread() {
    #if DEBUG || STAGE

        if !Assert.isUnitTesting && Thread.isMainThread {
            assertionFailure("😱😱😱 Some unexpected code is running ON the Main Thread 😱😱😱")
        }

    #endif
}

public func debugAssertMainThread() {
    #if DEBUG || STAGE

        if !Assert.isUnitTesting && !Thread.isMainThread {
            assertionFailure("😱😱😱 Some unexpected code is running OFF the Main Thread 😱😱😱")
        }

    #endif
}