XCTAssert helpers for Collections

XCTAssertCollection.swift

import XCTest

func XCTAssertEmpty<T>(_ expression: @autoclosure () throws -> T, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line) where T : Collection {
    XCTAssertTrue(try expression().isEmpty, message(), file: file, line: line)
}

func XCTAssertNotEmpty<T>(_ expression: @autoclosure () throws -> T, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line) where T : Collection {
    XCTAssertFalse(try expression().isEmpty, message(), file: file, line: line)
}

func XCTAssertNilOrEmpty<T>(_ expression: @autoclosure () throws -> T?, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line) throws where T : Collection {
    guard let collection = try expression() else { return }
    XCTAssertTrue(collection.isEmpty, message(), file: file, line: line)
}

func XCTAssertCount(_ expression1: @autoclosure () throws -> (any Collection)?, _ expression2: @autoclosure () throws -> Int, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line) {
    XCTAssertEqual(try expression1()?.count, try expression2(), message(), file: file, line: line)
}

func testCollectionAsserts() throws {
    XCTAssertEmpty([])
    XCTAssertEmpty("")
    XCTAssertNotEmpty([1])
    try XCTAssertNilOrEmpty(Optional<[Int]>.none)
    try XCTAssertNilOrEmpty([])
    XCTAssertCount([1,2,3], 3)
}