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feat: add email validation rule (#63)
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‎.gitignore‎

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# https://github.com/johnno1962/injectionforxcode
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iOSInjectionProject/
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./swiftpm
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.swiftpm/

‎README.md‎

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@@ -302,6 +302,7 @@ struct RegistrationView: View {
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| `RegexValidationRule` | Pattern matching validation | `RegexValidationRule(pattern: "^\\d{3}-\\d{4}$", error: "Invalid phone format")` |
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| `URLValidationRule` | Validates URL format | `URLValidationRule(error: "Please enter a valid URL")` |
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| `CreditCardValidationRule` | Validates credit card numbers (Luhn algorithm) | `CreditCardValidationRule(error: "Invalid card number")` |
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| `EmailValidationRule` | Validates email format | `EmailValidationRule(error: "Please enter a valid email")` |
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## Custom Validators
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‎Sources/ValidatorCore/Classes/Rules/EmailValidationRule.swift‎

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//
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// Validator
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// Copyright © 2023 Space Code. All rights reserved.
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//
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import Foundation
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/// An email validation rule.
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public struct EmailValidationRule: IValidationRule {
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// MARK: Types
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public typealias Input = String
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// MARK: Properties
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/// The validation error.
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public let error: IValidationError
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// MARK: Initialization
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public init(error: IValidationError) {
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self.error = error
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}
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// MARK: IValidationRule
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public func validate(input: String) -> Bool {
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let range = NSRange(location: .zero, length: input.count)
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if let regex = try? NSRegularExpression(
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// swiftlint:disable:next line_length
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pattern: "^(?!\\.)(?!.*\\.\\.)[A-Z0-9a-z._%+-]+(?<!\\.)@[A-Za-z0-9](?:[A-Za-z0-9-]{0,61}[A-Za-z0-9])?(?:\\.[A-Za-z0-9](?:[A-Za-z0-9-]{0,61}[A-Za-z0-9])?)*\\.[A-Za-z]{2,64}$",
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options: [.caseInsensitive]
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) {
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return regex.firstMatch(in: input, range: range) != nil
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}
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return false
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}
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}

‎Tests/ValidatorCoreTests/UnitTests/Rules/EmailValidationRuleTests.swift‎

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//
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// Validator
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// Copyright © 2025 Space Code. All rights reserved.
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//
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@testable import ValidatorCore
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import XCTest
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final class EmailValidationRuleTests: XCTestCase {
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var sut: EmailValidationRule!
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override func setUp() {
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super.setUp()
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sut = EmailValidationRule(error: "Invalid email")
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}
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override func tearDown() {
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sut = nil
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super.tearDown()
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}
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// MARK: - Valid Email Tests
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func testValidateWithValidEmail_ReturnsTrue() {
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// Given
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let email = "user@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithNumbers_ReturnsTrue() {
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// Given
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let email = "user123@example456.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithDots_ReturnsTrue() {
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// Given
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let email = "first.last@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithPlus_ReturnsTrue() {
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// Given
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let email = "user+tag@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithUnderscore_ReturnsTrue() {
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// Given
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let email = "user_name@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithHyphen_ReturnsTrue() {
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// Given
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let email = "user@my-domain.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithSubdomain_ReturnsTrue() {
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// Given
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let email = "user@mail.example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithLongTLD_ReturnsTrue() {
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// Given
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let email = "user@example.museum"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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func testValidateWithValidEmailWithTwoCharacterTLD_ReturnsTrue() {
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// Given
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let email = "user@example.io"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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// MARK: - Invalid Email Tests
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func testValidateWithInvalidEmailMissingAtSign_ReturnsFalse() {
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// Given
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let email = "invalid.email.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailMissingDomain_ReturnsFalse() {
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// Given
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let email = "user@"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailMissingLocalPart_ReturnsFalse() {
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// Given
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let email = "@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailMissingTLD_ReturnsFalse() {
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// Given
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let email = "user@example"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailMultipleAtSigns_ReturnsFalse() {
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// Given
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let email = "user@@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailSpaces_ReturnsFalse() {
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// Given
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let email = "user @example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailSpecialCharacters_ReturnsFalse() {
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// Given
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let email = "user#name@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailDotAtStart_ReturnsFalse() {
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// Given
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let email = ".user@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailDotAtEnd_ReturnsFalse() {
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// Given
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let email = "user.@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailConsecutiveDots_ReturnsFalse() {
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// Given
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let email = "user..name@example.com"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailTLDTooLong_ReturnsFalse() {
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// Given
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let email = "user@example.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklm"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithInvalidEmailSingleCharacterTLD_ReturnsFalse() {
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// Given
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let email = "user@example.c"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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// MARK: - Edge Cases
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func testValidateWithEmptyString_ReturnsFalse() {
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// Given
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let email = ""
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithOnlyAtSign_ReturnsFalse() {
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// Given
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let email = "@"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithOnlyDot_ReturnsFalse() {
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// Given
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let email = "."
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithWhitespaceOnly_ReturnsFalse() {
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// Given
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let email = " "
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertFalse(result)
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}
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func testValidateWithValidEmailWithMaxTLDLength_ReturnsTrue() {
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// Given
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let email = "user@example.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghij"
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// When
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let result = sut.validate(input: email)
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// Then
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XCTAssertTrue(result)
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}
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// MARK: - Error Property Tests
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func testErrorPropertyIsSetCorrectly() {
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// Given
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let expectedError = "Invalid email"
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// When
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let actualError = sut.error as? String
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// Then
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XCTAssertEqual(actualError, expectedError)
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}
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}

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