Add logic for more customizable password generator

passKitTests/Passwords/PasswordGeneratorTest.swift

@@ -0,0 +1,79 @@
+//
+//  PasswordGeneratorTest.swift
+//  passKitTests
+//
+//  Created by Danny Moesch on 26.02.20.
+//  Copyright © 2020 Bob Sun. All rights reserved.
+//
+
+import XCTest
+
+@testable import passKit
+
+class PasswordGeneratorTest: XCTestCase {
+
+    func testLimitedLength() {
+        [
+            PasswordGenerator(length: 15),
+            PasswordGenerator(length: -3),
+            PasswordGenerator(length: 128),
+        ].forEach { generator in
+            XCTAssertLessThanOrEqual(generator.limitedLength, generator.flavor.lengthLimits.max)
+            XCTAssertGreaterThanOrEqual(generator.limitedLength, generator.flavor.lengthLimits.min)
+        }
+    }
+
+    func testAcceptableGroups() {
+        [
+            (15, 4),
+            (19, 4),
+            (9, 5),
+            (11, 6),
+            (259, 13),
+        ].forEach { length, groups in
+            XCTAssertTrue(PasswordGenerator(length: length).isAcceptable(groups: groups))
+        }
+    }
+
+    func testNotAcceptableGroups() {
+        [
+            (15, 0),
+            (19, 20),
+            (9, 9),
+            (11, -1),
+        ].forEach { length, groups in
+            XCTAssertFalse(PasswordGenerator(length: length).isAcceptable(groups: groups))
+        }
+    }
+
+    func testGroupsAreNotcceptableForXKCDStyle() {
+        var generator = PasswordGenerator(length: 15)
+
+        XCTAssertTrue(generator.isAcceptable(groups: 4))
+
+        generator.flavor = .xkcd
+        XCTAssertFalse(generator.isAcceptable(groups: 4))
+    }
+
+    func testRandomPasswordLength() {
+        [
+            PasswordGenerator(),
+            PasswordGenerator(groups: 1),
+            PasswordGenerator(length: 25),
+            PasswordGenerator(length: 47, groups: 12),
+            PasswordGenerator(useDigits: true),
+        ].forEach { generator in
+            XCTAssertEqual(generator.generate().count, generator.length)
+        }
+    }
+
+    func testXKCDPasswordGeneration() {
+        let typicalPassword = PasswordGenerator(flavor: .xkcd).generate()
+        XCTAssertFalse(typicalPassword.isEmpty)
+        XCTAssertFalse(typicalPassword.trimmingCharacters(in: .letters).isEmpty)
+
+        let passwordWithoutSeparators = PasswordGenerator(flavor: .xkcd, useDigits: false, useSpecialSymbols: false).generate()
+        XCTAssertFalse(passwordWithoutSeparators.isEmpty)
+        XCTAssertTrue(passwordWithoutSeparators.trimmingCharacters(in: .letters).isEmpty)
+    }
+}