Added the Utility package (#29)

This PR contains the work done to create the new **Utility** package within the project, and also included in it the `NormalizeEmail` method, as it's not something that belongs to the **Infrastructure** package. Reviewed-on: rock-n-code/loud-amsterdam#29 Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
2026-08-01 11:15:27 +00:00
parent efc933d5d0
commit 5f4316b85b
8 changed files with 193 additions and 6 deletions
@@ -0,0 +1,57 @@
+import Testing
+
+@testable import Utility
+
+@Suite(
+    "NormalizeEmail method",
+    .tags(.method)
+)
+struct NormalizeEmailTests {
+
+    // MARK: Properties
+
+    private let normalize = NormalizeEmail()
+
+    // MARK: Functional tests
+
+    @Test(arguments: [
+        ("fan@loudmail.nl", "fan@loudmail.nl"),
+        ("Fan@LoudMail.NL", "fan@loudmail.nl"),
+        (" fan@loudmail.nl\n", "fan@loudmail.nl"),
+        ("fan+gigs@loudmail.nl", "fan+gigs@loudmail.nl"),
+        // Exactly 254 bytes: the longest address the validator accepts.
+        (String(repeating: "a", count: 242) + "@loudmail.nl", String(repeating: "a", count: 242) + "@loudmail.nl"),
+    ])
+    func `normalizes a valid address`(
+        submitted: String,
+        expected: String
+    ) {
+        #expect(normalize(submitted) == expected)
+    }
+
+    @Test(arguments: [
+        nil,
+        "",
+        "   ",
+        "not-an-email",
+        "missing@dot",
+        "@loudmail.nl",
+        "fan@",
+        "fan@.nl",
+        "spaced out@loudmail.nl",
+        "fan@loud mail.nl",
+        // One byte over the 254-byte limit.
+        String(repeating: "a", count: 243) + "@loudmail.nl",
+        // Few enough characters, but multibyte ones put it over the byte limit.
+        String(repeating: "é", count: 130) + "@loudmail.nl",
+        // Control characters are not whitespace, so only the dedicated check catches them.
+        "fan\u{00}@loudmail.nl",
+        "fan@loudmail.nl\u{7F}",
+    ] as [String?])
+    func `rejects a missing or invalid address`(
+        submitted: String?
+    ) {
+        #expect(normalize(submitted) == nil)
+    }
+
+}