Testing if a version meets the minimum

Playground.swift

import Foundation

struct Test {
    var foundVersion: String
    var requiredMinimumVersion: String
    var meetsMinimum: Bool
}

let tests = [
    Test(foundVersion: "2.8", requiredMinimumVersion: "2.9", meetsMinimum: false),
    Test(foundVersion: "2.9", requiredMinimumVersion: "2.9", meetsMinimum: true),
    Test(foundVersion: "2.9.1", requiredMinimumVersion: "2.9", meetsMinimum: true),
    Test(foundVersion: "3.0", requiredMinimumVersion: "2.9", meetsMinimum: true),

    Test(foundVersion: "2.9", requiredMinimumVersion: "2.9.0", meetsMinimum: true), // FAILS

    Test(foundVersion: "2.9.1", requiredMinimumVersion: "2.9.1", meetsMinimum: true),
    Test(foundVersion: "3.0", requiredMinimumVersion: "2.9.1", meetsMinimum: true),

    Test(foundVersion: "3.3.0-test-1", requiredMinimumVersion: "2.9.1", meetsMinimum: true),
]

for test in tests {
    let meetsMinimum = test.foundVersion.compare(test.requiredMinimumVersion, options: .numeric) != .orderedAscending
    if meetsMinimum == test.meetsMinimum {
        print("PASS")
    } else {
        print("FAIL \(test.foundVersion) \(test.requiredMinimumVersion)")
    }
}

@allendav probably worth adding:

Test(foundVersion: "2.15", requiredMinimumVersion: "2.2", meetsMinimum: true), // Checks that 2.15 isn't compared as a decimal
Test(foundVersion: "2.9.1-test-1", requiredMinimumVersion: "2.9.1", meetsMinimum: true), //checks that it's not just passing because of the major/minor numbers being higher
Test(foundVersion: "2.8.1", requiredMinimumVersion: "2.8.2", meetsMinimum: false), //didn't have a negative test for patch
Test(foundVersion: "2.9.0", requiredMinimumVersion: "2.9", meetsMinimum: true), //To check that fixing the reverse case doesn't break this one!