added tests

Tests/MessagingInApp/Gist/Utilities/StringPercentEncodeTests.swift

@@ -0,0 +1,69 @@
+@testable import CioMessagingInApp
+import XCTest
+
+class StringPercentEncodeTests: XCTestCase {
+    func test_givenValidCharacter_expectEncodedURL() {
+        let input = "https://example.com/path#fragment"
+
+        let encoded = input.percentEncode(character: "#")
+
+        XCTAssertEqual(encoded, "https://example.com/path%23fragment")
+    }
+
+    func test_givenMultipleOccurrences_expectAllEncoded() {
+        let input = "https://example.com/path#fragment#another"
+
+        let encoded = input.percentEncode(character: "#")
+
+        XCTAssertEqual(encoded, "https://example.com/path%23fragment%23another")
+    }
+
+    func test_givenMultipleCharacter_expectEncodedGivenOnly() {
+        let input = "https://example.com/path#source=link&medium=email"
+
+        let encoded = input.percentEncode(character: "#")
+
+        XCTAssertEqual(encoded, "https://example.com/path%23source=link&medium=email")
+    }
+
+    func test_givenCharacterInAllowedSet_expectUnchangedString() {
+        let input = "https://example.com/path/fragment"
+
+        // '/' is allowed in `.urlPathAllowed`
+        let encoded = input.percentEncode(character: "/")
+
+        XCTAssertEqual(encoded, input, "The '/' character should not be encoded as it is allowed in the path")
+    }
+
+    func test_givenCustomAllowedCharacterSet_expectEncodedSpaces() {
+        let input = "https://example.com/path with spaces"
+
+        let encoded = input.percentEncode(character: " ", withAllowedCharacters: .alphanumerics)
+
+        XCTAssertEqual(encoded, "https://example.com/path%20with%20spaces")
+    }
+
+    func test_givenNoTargetCharacter_expectUnchangedString() {
+        let input = "https://example.com/path/fragment"
+
+        let encoded = input.percentEncode(character: "#")
+
+        XCTAssertEqual(encoded, input)
+    }
+
+    func test_givenEmptyTargetCharacter_expectUnchangedString() {
+        let input = "https://example.com/path/fragment"
+
+        let encoded = input.percentEncode(character: "")
+
+        XCTAssertEqual(encoded, input)
+    }
+
+    func test_givenEmptyInput_expectEmptyString() {
+        let input = ""
+
+        let encoded = input.percentEncode(character: "#")
+
+        XCTAssertEqual(encoded, "")
+    }
+}